Download presentation
Presentation is loading. Please wait.
1
Metamorphic Rocks Rocks Under Stress
2
Metamorphism Recrystalization Solid-State Chemical Reactions No Melting
3
Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism
4
Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism
5
Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism Lithostatic pressure Directional Pressure
6
Directed Pressure Results in: Foliation
7
Foliation Under a Microscope
8
Metamorphic Grade
9
Parent Rock Composition Temperature Pressure Fluids Factors that affect Metamorphism
10
Types of Metamorphism
11
High T, Low P Metamorphism Contact Metamorphism
12
Increase of T and P Together Regional Metamorphism
13
Regional Metamorphism
14
Lots of Hot Fluids Hydrothermal Metamorphism
15
Metamorphic Rocks - Identification
16
Metamorphic Textures (All Crystalline) Foliated Nonfoliated
17
Foliation
18
Composition - Minerals
19
Foliated Metamorphic Rocks
20
Nonfolited Metamorphic Rocks
21
Metamorphic Rocks - Interpretation
22
Parent Rock Composition Temperature Pressure Fluids Type of Metamorphism Metamorphic Rock “Translations”
23
Chemical Composition Mineral Composition Texture: Foliation Parent Rock (Protolith) T & P of Formation (Depth, Type, & Facies)
24
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
25
NonFoliated Rocks Parent Rock Limestone Marble (Low to High Grade)
26
Nonfoliated Rocks (cont.) Quartzite Metacoglomerate Parent Rocks Sandstone Conglomerate
27
Mineral Composition - Index Minerals Felsic Protolith
28
Mineral Composition - Mineral Assemblages
29
Mineral Composition - Geothermometers Rock Forms: 500-550°C Staurolite - Forms 500-750°C Garnet - Forms 450-700°C Muscovite - Forms 300-550°C
30
Mineral Composition & Texture tell us about Metamorphic Environments (= Metamorphic Facies)
31
Metamorphic Facies
32
Facies and Rock Type
33
Foliated Metamorphic Rocks Parent Rock - Shale Slate (Low Grade) Phyllite (Low Grade)
34
Foliated Rocks (cont.) Phyllite (Low Grade) Schist (Medium Grade)
35
Foliated Rocks (cont.) Felsic Parent Rock Gneiss (High Grade) Migmatite (Very High Grade)
36
Metamorphic Facies
37
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.)
38
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.
39
Rock Cycle Magma Igneous Rocks Sedimentary Rocks Metamorphic Rocks Sediment Crystallization Melting Metamorphism Lithification Weathering Erosion Transport Deposition
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.