metamorphic rocks - fossilhub · 2013-10-31 · metamorphic rocks metamorphism . 31/10/2013 2...
TRANSCRIPT
![Page 1: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/1.jpg)
31/10/2013
1
5. Under Pressure
Metamorphic Rocks
Metamorphism
![Page 2: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/2.jpg)
31/10/2013
2
Metamorphism
Heat and pressure
Can affect any rock
Low-High grade
Solid state change
Hand specimens
First impressions?
![Page 3: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/3.jpg)
31/10/2013
3
Metamorphism
Temperature >200°C
AND/OR
Pressure >300 MPa (3 kbar)
AND/OR
Chemically active fluids
Metamorphic facies
![Page 4: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/4.jpg)
31/10/2013
4
Thermal metamorphism
Igneous intrusion bakes surrounding rocks
Thermal metamorphism
![Page 5: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/5.jpg)
31/10/2013
5
Hornfels
Marble
Thermal metamorphism
Marble crystals
Limestone grains
![Page 6: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/6.jpg)
31/10/2013
6
Metamorphism by pressure
Metamorphism by pressure SLATE
![Page 7: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/7.jpg)
31/10/2013
7
Metamorphism by pressure
SLATE
SLATE
Regional metamorphism
High temps and pressures
![Page 8: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/8.jpg)
31/10/2013
8
= High-grade metamorphism
Mechanical metamorphism
Mylonite = milled
![Page 9: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/9.jpg)
31/10/2013
9
Chemical metamorphism
Metasomatism:
Soapstone
![Page 10: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/10.jpg)
31/10/2013
10
Key metamorphic features
Cleavage:
Slaty cleavage
![Page 11: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/11.jpg)
31/10/2013
11
Welsh slate
belts
Penrhyn Slate Quarry,
Bethesda, c. 1900
Foliation
Schist under the microscope
![Page 12: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/12.jpg)
31/10/2013
12
Multiple foliation
Banding Gneiss, Stockholm
![Page 13: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/13.jpg)
31/10/2013
13
Partial melting migmatite
Metamorphic zones
andalusite
Almandine garnet
![Page 14: Metamorphic Rocks - FossilHub · 2013-10-31 · Metamorphic Rocks Metamorphism . 31/10/2013 2 Metamorphism Heat and pressure Can affect ... Pressure >300 MPa (3 kbar) AND/OR Chemically](https://reader030.vdocuments.us/reader030/viewer/2022041022/5ed29f219c816a0c43326538/html5/thumbnails/14.jpg)
31/10/2013
14
Metamorphic facies
Next week Folds, Faults & Plate Tectonics