STRUCTURAL EVOLUTION OF THE TALLY HO SHEAR ZONE, SOUTHERN by zbs19295

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									STRUCTURAL EVOLUTION OF THE TALLY HO SHEAR ZONE,
SOUTHERN YUKON TERRITORY
Amy Tizzard* and Stephen Johnston
University of Victoria, *tizz@uvic.ca
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              STRUCTURES
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         At least 3 episodes of deformation are
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          recorded in the rocks of the Tally Ho
               INTRODUCTION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Mountain area.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Style of
The Tally Ho Shear Zone is located along the                                                                                                                                                 PRELIMINARY                                                                                                                                                                                                                                                                                                                       LEGEND                         *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Episode                   Deformation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Field Evidence
                                                                                                                                                                             N
western boundary of the Whitehorse Trough in                                                                                                                                               GEOLOGICAL MAP                                                                                                                                                                                                                                                                                                 CRETACEOUS                                                                                                                         Mylonitization, schistosity and elongation
southern Yukon, separating the Stikine Terrane to                                                                               0                       300                                                                                                                                                                                                                                                                                                                                                                                                                                              D1             ductile shear        lineations developed in Triassic volcanic,
                                                                                                                                                                     W             E       OF THE TALLY HO                                                                                                                                                                                                                                                                                                               Wheaton Valley Granodiorite                                                                                             plutonic and volcaniclastic rocks.
the east and the Nisling Terrane to the west.                                                                                              kilometres
                                                                                                                                                                                            MOUNTAIN AREA                                                                                                                                                                                                                                                                                                                Wheaton River Volcanics                                                                                             Thrusting of pyroxenite and gabbro onto
                                                                                                                                                                             S                                                                                                                                                                                                                                                                                                                                                                                                                           D2             compression
                                                                                                                    NWT                                                                             Parts of NTS Map Sheets                                                                                                                                                                  30                                                                                                                                                                                                                                                      mylonitinized sediments
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Whitehorse Pluton
Complex geologic structures, plutonism and                                                                           YT                                                                                105 D/2, 3, 6 and 7                                                                                                                                    40                                                                                                                                                                                                                                                                                       (see cross-section).
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Millhaven Conglomerate
abundant Tertiary volcanism obscure the nature                                                                                                                                                                                                                                                                                                            Mount
                                                                                                                                                                                                                                                                                                                                                         Wheaton                                                                                                                                                                                                                                         D3                  compression
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Elongation lineations are folded into east-




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                vergent crenulations and kink bands




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of this boundary and its relation to adjacent                                                                                                                                                                                                                                                                                                                                                                                       D/6 D/7                                                                   JURASSIC




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     found in mylonitic rocks.




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                                                                                                                                                                                                                      Ro
                                                                                                                                                                                                     to
                                                                                                                                                              Stikine Terrane




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                                                                                                                                                                                                                                                                           Ho




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terranes.




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                                                                                                                                                                                                                                                                                                                                              84
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Bennett Granite




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            brittle to




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                                                                                                                                                                                                                                                                                   ly




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                                                                                                                                                                                                                                                                                 al                                                                           88
                                                                                                                                                                                                                                                                                                                                                                                                                                D/3 D/2                                                                                                                                                                                                      Discrete shears and brittle faulting in mid-




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                                                                                                                                                                                                                                                                                T
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      D4                 brittle-ductile




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                                                                                                                                                              Nisling Terrane                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Cretaceous and younger rocks.




                                                                                                                                                                                                       An
                                                                                                                                                                                                                                                                                                                                                              26


                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          TRIASSIC                                                                                                            shear
Detailed geological mapping, with associated                                                                                                                                                                                                                                                              65

                                                                                                                                                                                                                                                                                                                                   56

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Lewes River Group
geochronology and geochemistry sampling was




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      River
                                                                                                                                                                                                                                                                                                                                                                                                             s
                                                                                                                                                                                                                                                                                76




                                                                                                                                                                                                                                                                                                                                                                                                           en
                                                                                                                                                                                                                                                                                          09   58

                                                                                                  Dawson City




                                                                                                                                                                                                                                                                                                                                                                                                            v
                                                                                                                                                                                                                                                                                          11
                                                                                                                                                                                                                                                                                04
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         massive agglomerate




                                                                                                                                                                                                                                                                                                                                                                                                        Ste
                                                                                                                                                                                                                                                                                                                                                                                            86                                                 65
                                                                                 ALASKA




undertaken to better understand the Tally Ho
                                                                                                                                                                                                                                                                 47

                                                                                                                                                                                                                                                            49


                                                                                                                                                                                                                                                                                                                                                                                   B                                                                                                                                     variably strained volcaniclastic
                                                                                   YT




                                                                                                                                                                                                                                                                                                                                    80
                                                                                                                                                                                                                                                                                                                                              12



Shear Zone and thus the relationship between                                                                                                                                                                                                     74
                                                                                                                                                                                                                                                                                                                                                         84
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         and volcanic rocks

Stikinia and the Nisling Assemblage.
                                                                                                                                                                                                                                                                                                         38
                                                                                                                                                                                                                                                                      31
                                                                                                                                                                                                                                                                                                                                                                                                                                Mount                                                                                    massive augite-pheric basalt
                                                                                                                                                                                                                                                                                                                                                                                                                               Stevens
                                                                                                                    Tin                                                                                                                                                                                                                                                                                                         64

                                                                                                                       tin
                                                                                                                          a
                                                                                                                              Fa
                                                                                                                                                                                                                             58                                                                     44
                                                                                                                                                                                                                                                                                                         19
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         moderately strained augite
                                                                                                                                 ult                                                                                                                                                                                                                                                                                                                     72
                                                                                                                                                                                                                                            83                                                           38
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         basalt and volcaniclastic rocks
                                                                                  De                                                                                                                                                             Tally Ho
                                                                                    na
                                                                                       li
                                                                                          Fa
                                                                                                                                             105                                                                                                 Mountain                                                                     48
                                                                                                                                                                                                                                                                                                                                                    20
                                                                                                                                                                                                                                                                                                                                                         37
                                                                                                                                                                                                                                                                                                                                                                                                                                               81                                                                        marble
                                                                                            ul                                                                                                                                                                                                                      48

                                                                                              t                                                                                                                                       88
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             N = 168
                                                      Tally Ho Mountain                                                                                                                                                                29                                                                                                12
                                                                                                                                                                                                                                                                                                                                               43
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         highly strained and mylonitic                                    Contour Interval = 3
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               N = 63
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      1    0.60%    8    4.76%
                                                       in relation to the                                                                                                                                                                              67
                                                                                                                                                                                                                                                                                                                                                                                                                                                              30
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         volcanic and volcaniclastic rocks                            2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      3
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           1.19%
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           1.79%
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    9
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    10
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         5.36%
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         5.95%
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                pole to girdle
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                mean elongation lineation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Contour Interval = 3
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                1   1.59%
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      4    2.38%    11   6.55%                                                                                  2   3.17%
                                                      Annie Lake Road                                                                                                                                                                                                                                                                                                                                                           79                                                                                                                                                    5    2.98%    12   7.14%                                                                                  3   4.76%

                                                                                                                                                                                                                                  A
                                                                                                                                                                                                                                                                                     68




                                                                                                                                                                                                       Pa
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      6    3.57%    13   7.74%                                                                                  4   6.35%

                                                         and Wheaton                                                          Whitehorse
                                                                                                                                                                                                                                                                                                                                                                                                                                     18
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         foliated leucogabbro                                         7    4.17%                                                                                                5   7.94%




                                                                                                                                                                                                           r tr
                                                                                                                                                                                                                                                                                                                                                                                                                                                         76
                                                                                                                                                                                                                                                                                                               37

                                                      River. Photo faces                                                                    STUDY AREA




                                                                                                                                                                                                               id
                                                                                                                                                                             YT
                                                                                                                                                                                                                                                  38
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Contoured stereoplot of poles to       Contoured stereoplot of




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Wheaton
                                                                                                        TALLY HO         D                                     Watson Lake




                                                                                                                                                                                                                 ge
                   ANNIE LAKE
                                                          southwest.                                   SHEAR ZONE
                                                                                                                                                                                                                                                                                                                         56
                                                                                                                                                                                                                                                                                                                                                                                                                                               66                                                                        massive pyroxenite
                                                                                                                                                                              BC                                                                                                                                                                                                                                                                                                                                                                                                       foliation planes in the Tally Ho elongation lineations in the Tally




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                     ROAD                                                                                                                                                                                                                                        67                                                                                                                                                                                 17
                                WHEATON RIVER




                                                                                                                                                                                                                      ee
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Limit of mapping/outcrop                                     Mountain area. A weak girdle is Ho Mountain area. A weak cluster




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                                                                                    Location of study area and simplified tectonic boundaries of Stikinia                                                                                                                                                                                                                                                                                                                                                                Geological boundary                                            definable by the methods of      is definable by the methods of
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         (defined, approximate, assumed)
                                                                                    and the Nisling Assemblage. Tectonic boundaries are modified after                                                                                                                                                                                                                                      07    Dickson
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Woodcock and Naylor (1983).       Woodcock and Naylor (1983).
                                                                                                                                                                                                                                                                                                                                                                                                                               74
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Fault
                                                                                                                                                                                                                                                                                                                                                                                                    Hill                                  64

                                                                                                       Wheeler and McFeely (1991).                                                                                                                                                                                                                                           34
                                                                                                                                                                                                                                                                                                                                                                                             31
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         (defined, approximate, assumed)
                                                                                                                                                                                                                                                                                                                                                                                                   66
                                                                                                                                                                                                                                                                                                                                                                                       48
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Fault (transcurrent)
                                                                                                                                                                                                                                                                                                                                                                                  34

                                                                                                                                                                                                                                                                                                                                                                                                                    45
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Fault (thrust)
                                                                                                                                                                                                                                                                                                                                                                   45                   07
                                                                                                                                                                                                                                                                                                                                                                   29

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  25     Foliation, schistosity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Schematic representation of
                                                                                                                                                                                                                                                                                                                                                                                                               85

                                                                                                                                                                                                                                                                                                                                                                        68
                                                                                                                                                                                                                                                                                                                                                                                                                     02
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  25
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          deformed rocks on Tally Ho
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Lineation (elongation, rodding, mineral)
                                                                                                                                                                                                                                                                                                                                                                                                  38
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  25
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Mountain. Mylonitized
                                                MAJOR LITHOLOGIES
                                                                                                                                                                                                                                                                                                                                                                                                          81
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Minor fold axis                            Topographic                                                 2                             rocks typically have:
                                                                                                                                                                                                                                                                                                                                                                                                                          70
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    contour
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Synform, antiform                                                                                                          1) southeast trending and shallowly
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Road                                                                                 plunging elongation lineations
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Dyke
                                                                                                                                                 pyroxenite       ol?                                                                                                                                                                                                                                                                                                                                                                                               Water                                        N
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    1
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         3            2) south plunging and east vergent
                                                The majority of rocks in the study area                                                                                                               Contour Interval 100 feet                                                                                                                                                                                                                                                                                        B Line of cross section                      Swamp
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         W
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           S
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 E
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  crenulations
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   A
                                                belong to the Triassic Lewes River Arc                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               10 cm                               3) moderate to steeply dipping
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              *   Refer to Hart and Radloff (1990) for rock unit descriptions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    foliation
                                                (Hart and Radloff 1990). Major lithogies
                                                include leucogabbro, pyroxenite, mylonite,
                                                greenschist, augite basalt, marble and
 Augite porphyroclast on Dickson Hill           volcaniclastic rocks.                                                                          Dark grey, coarse-grained pyroxenite on
                                                                                                                                                                                                    Southwest
                                                                                                                                                                                                                        GEOLOGICAL CROSS SECTION OF TALLY HO MOUNTAIN
                                                                                                                                                                                                                                                                                                                                                                                                                                                         Northeast
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        SUMMARY
                                                                                                                                                Tally Ho Mountain. Serpentinization is
 showing sinistral sigma-type augen.                                                                                                            pervasive and cumulate textures with                       A                                                                                                                                                                                                                                                       B                                                                                                                Rocks in the study area have experienced at
                                                Plutonic rocks of the region are part of the                                                       relict olivine (ol) may be present.
                                                                                                                                                                                                    1900                                                                                                                                                                                                                                                                                                                                                                            least 3 phases of deformation since the
                                                Whitehorse Plutonic Suite, and include the                                                                                                                                                                                                                                                                                                                                                                              6000
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    late Triassic.
                                                                                                                                                                                           metres




                                                                                                                                                                                                                                                                                                                                                                                                                                                                               feet
                                                Bennett Granite and Wheaton Valley                                                                                                                  1600
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        5000
                                                Granodiorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Stereoplot analyses suggest that sub-
                                                                                                                                                                                                    1300
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        4000                                                                                                        horizontal upright folding may be present in
                                                Cretaceous and Eocene volcanism cross-                                                                                                              1000                                                                                                                                                                                                                                                                                      En-echelon tension gashes indicating                                                  the sheared rocks with movement
                                                cut structures throughout the study area.                                                                                                                                                                                                                                500 metres
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  sinistral semi-brittle shear in                                                    to the southeast.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  granodiorite on Mt. Wheaton.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Crenulations may reflect folding of a thrust
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    fault which juxtaposes ultramafic rocks
                                                                                                                                                 Preferrential alignment of clasts in a
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    against mylonite.




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            nite
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    le
                                                                            gr




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             lo
Characteristic coarse-grained texture of




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          my
                                                                                                                                                    strained volcaniclastic rock on
the foliated leucocratic gabbro on Tally                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Future work will examine these and




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                                                                                                                                                             Mt. Stevens.




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    Ho Mountain and Dickson Hill.




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  my
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    other field relations to help further the
                                                                 marble
                                                                                       mylonite
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    understanding of the tectonic evolution of the




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               ma nite
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       e
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    northern Canadian Cordillera.




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  rb l
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 lo
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               my
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     ble ite
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  m ylon
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   m
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  m

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         REFERENCES
                                                    East facing photo of a scarp on the north face of Tally Ho                                                                            East-vergent crenulation in mylonite on                                                                                                                              Crenulation lineations in augite mylonite                                                                                  South-vergent duplex structures on the                                                   Hart, C.J.R. and Radloff, J.K., 1990. Geology of Whitehorse, Alligator Lake, Fenwick Creek, Carcross and part of
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Robinson Map Areas (105D/11, 6, 3, 2 & 7). Indian and Northern Affairs Canada: Yukon Region, Open File
                                                     Mountain. Intercalated marble and mylonite are in the                                                                                         Tally Ho Mountain.                                                                                                                                                      on Dickson Hill.                                                                                                  north face of Tally Ho Mountain.                                                           1990-4.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Wheeler, J.O. and McFeely, P., 1991. Tectonic Assemblage map of the Canadian Cordillera and adjacent parts of the
                                                foreground with Wheaton Valley Granodiorite in the background.                                                                                                                                                                                                                                                                                                                                                                                       Photo faces east.                                                                   United States of America. Geological Survey of Canada, Map 1712A, 1:2,000,000 scale.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Woodcock, N.H. and Naylor, M.A., 1983. Randomness testing in three-dimensional orientation data. Journal of
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Structural Geology, vol 5, no 5.

								
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