S06 Lec5a rocksmet

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Metamorphic Rocks: 

Metamorphic Rocks Rocks Under Stress

Metamorphism: 

Metamorphism Recrystalization Solid-State Chemical Reactions No Melting

Factors that affect Metamorphism: 

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

Factors that affect Metamorphism: 

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

Factors that affect Metamorphism: 

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

Directed Pressure Results in:: 

Directed Pressure Results in: Foliation

Foliation Under a Microscope: 

Foliation Under a Microscope

Metamorphic Grade: 

Metamorphic Grade

Factors that affect Metamorphism: 

Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism

Types of Metamorphism: 

Types of Metamorphism

High T, Low P Metamorphism: 

High T, Low P Metamorphism Contact Metamorphism

Increase of T and P Together: 

Increase of T and P Together Regional Metamorphism

Regional Metamorphism: 

Regional Metamorphism

Lots of Hot Fluids: 

Lots of Hot Fluids Hydrothermal Metamorphism

Metamorphic Rocks - Identification: 

Metamorphic Rocks - Identification

Metamorphic Textures (All Crystalline): 

Metamorphic Textures (All Crystalline) Foliated Nonfoliated

Foliation: 

Foliation

Composition - Minerals: 

Composition - Minerals

Foliated Metamorphic Rocks: 

Foliated Metamorphic Rocks

Nonfolited Metamorphic Rocks: 

Nonfolited Metamorphic Rocks

Metamorphic Rocks - Interpretation: 

Metamorphic Rocks - Interpretation

Metamorphic Rock “Translations”: 

Parent Rock Composition Temperature Pressure Fluids Type of Metamorphism Metamorphic Rock “Translations”

Metamorphic Rock “Translations”: 

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

Chemical Composition - Parent Rock (Protolith): 

Chemical Composition - Parent Rock (Protolith) Overall chemical composition of the protolith is the same as the metamorphic rock created. Protolith Felsic Mafic All Quartz All Calcite Metamorphic Rock Felsic Mafic Quartz Calcite

NonFoliated Rocks: 

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

Nonfoliated Rocks (cont.): 

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

Mineral Composition - Index Minerals: 

Mineral Composition - Index Minerals Felsic Protolith

Mineral Composition - Mineral Assemblages: 

Mineral Composition - Mineral Assemblages

Mineral Composition - Geothermometers: 

Mineral Composition - Geothermometers Rock Forms: 500-550°C

Mineral Composition & Texture tell us about Metamorphic Environments (= Metamorphic Facies): 

Mineral Composition & Texture tell us about Metamorphic Environments (= Metamorphic Facies)

Metamorphic Facies: 

Metamorphic Facies

Facies and Rock Type: 

Facies and Rock Type

Foliated Metamorphic Rocks: 

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

Foliated Rocks (cont.): 

Foliated Rocks (cont.) Phyllite (Low Grade) Schist (Medium Grade)

Foliated Rocks (cont.): 

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

Metamorphic Facies: 

Metamorphic Facies

Intermission: Quiz What Can you say about the history of this rock?: 

Intermission: Quiz What Can you say about the history of this rock? Schist Metamorphism of a shale parent rock under medium grade metamorphic conditions. (Specific index minerals would tell you specific T & P.)

Intermission: Quiz What Can you say about the history of this rock?: 

Intermission: Quiz What Can you say about the history of this rock? Marble Metamorphism of a limestone parent rock. Grade could be low, medium or high. Parent rock formed in a shallow tropical ocean.

Rock Cycle: 

Rock Cycle Magma Igneous Rocks Sedimentary Rocks Metamorphic Rocks Sediment Crystallization Melting Metamorphism Lithification Weathering Erosion Transport Deposition