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					Rocks

C. Metamorphic Rocks

What are metamorphic rocks formed from?

Where do metamorphic rocks form?

Metamorphic rocks are formed from other rocks Which are changed by heat and pressure

Metamorphic Rocks •generated by recrystallization of either igneous or sedimentary rocks by the action of any or all of the following: Pressure Temperature Mineral Rich Fluids
The type of metamorphic rock is determined by the parent rock, and the P/T conditions. Metamorphism causes: Growth of new minerals Deformation and rotation of mineral grains Recrystallization of minerals as larger grains Production of strong brittle rocks

What rocks produce what Metamorphic rocks? Rock
• • • • • Mudstone, mafic igneous Shale Limestone Granite, schist Quartz sandstone

Metamorphic Rock
•Schist? •Slate •Marble •Gneiss •Quartzite

Metamorphic rocks are divided into several groups on the basis of the P/T conditions of formation:
Burial Metamorphic Rocks: are formed under the base of immensely thick layers of sediments Regional Metamorphic Rocks: generated mainly by pressure in the roots of mountain belts. Colliding continental plates push up the mountains and alter the rock. Contact Metamorphic Rocks: occur where a mass of magma invades and bakes the rock around it.

Dynamic Metamorphic Rocks: are formed along transform fault zones.

Contact Metamorphic Rocks generated mainly by temperature at the margins of igneous intrusions. Sometimes called thermal metamorphic rocks.

a-sedimentary rocks metamorphic d-regional metamorphic

b-contact metamorphic c-burial e-igneous rock

Regional Metamorphic Rocks: generated mainly by pressure in the roots of mountain belts. Colliding continental plates push up the mountains and alter the r

Contact Metamorphic Rocks: occur where a mass of magma invades and bakes the rock aroun

Foliation: Metamorphic rocks can be foliated and nonfoliated

Some common Metamorphic Rocks you will have to learn. Marble*

Gneiss*
Schist* Slate*

* = must know for test


				
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