Rocks The Geologic Dictionary. Metamorphic Rocks Rocks Under Stress.

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Presentation transcript:

Rocks The Geologic Dictionary

Metamorphic Rocks Rocks Under Stress

Metamorphism Recrystalization Solid-State Chemical Reactions No Melting

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism Lithostatic pressure Directional Pressure

Directed Pressure Results in: Foliation

Foliation Under a Microscope

Metamorphic Grade

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

Metamorphic Rocks - Identification

Metamorphic Textures (All Crystalline) Foliated Nonfoliated

Foliation

Composition - Index Minerals

Mineral Composition - Geothermometers Rock Forms: °C Staurolite - Forms °C Garnet - Forms °C Muscovite - Forms °C

Foliated Metamorphic Rocks Parent Rock - Shale Slate (Low Grade) Schist (Medium Grade)

Foliated Rocks (cont.) Felsic Parent Rock Gneiss (High Grade) Migmatite (Very High Grade)

NonFoliated Rocks Parent Rock Limestone Marble (Low to High Grade)

Nonfoliated Rocks (cont.) Quartzite Metacoglomerate Parent Rocks Sandstone Conglomerate

Metamorphic Rocks - Interpretation

Metamorphic Environments = Metamorphic Facies

Metamorphic Rock “Translations” Chemical Composition Mineral Composition Foliation Parent Rock (Protolith) T & P of Formation (Depth / Facies)

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