WVU GEOL 341 - Metamorphic Rocks and Cleavage Development (8 pages)

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Metamorphic Rocks and Cleavage Development



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Metamorphic Rocks and Cleavage Development

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Pages:
8
School:
West Virginia University
Course:
Geol 341 - Structural Geology

Unformatted text preview:

Geol341 J Toro Topics Metamorphic Rocks and Cleavage Development Fabrics Foliation cleavage lineation Cleavage and Folds Geometry Strain significance Origin of Cleavage Pressure solution Passive rotation Recrystallization Shear zones Chapter 12 Fossen Many diagrams are from Earth Structure van der Pluijm and Marshak 2004 Geothermal Gradient and Metamorphism Naming of Metamorphic Rocks Slatey cleavage Gneiss 1 Looks Like Bedding but is it Metamorphic layering Brooks Range AK Quartz mica schist Isoclinal Fold Fabric Fabric Elements Arrangement of component features in a rock van der Pluijm Marshak Includes Texture Bedding Compositional layering Crystallographic orientation Structure Fold Hinges Microstructure Cleavage planes Preferred Orientation Mineral elongation lineation Passchier and Trouw 1996 2 Metamorphic Fabrics Foliation Cleavage Schistosity Lineation Mineral Lineation Intersection Lineation Intersection Lineation S0 bedding Mineral Elongation Lineation Stretching lineation S1 First cleavage S0 S1 Intersection S0 Random fabric Foliation Lineation S1 Metamorphic Fabrics Foliation Penetrative Fabric Cleavage Schistosity Lineation Spaced Fabric S tectonite L tectonite L S tectonite Cleavage A kind of foliation Deformation Fabric Rock splits along preferred planes Lachlan fold belt Australia Photo by E L Miller Paleozoic Quartzite Brooks Range AK 3 Spaced cleavage The beginning of Metamorphism Axial Planar Cleavage Cambrian Rocks South Verkhoyansk foldbelt Siberia Relationship of cleavage to folding Axial planar cleavage Keck photo Axial Planar cleavage Processes of Cleavage Development Rotation of minerals Recrystallization Pressure solution Crenulation 4 Cleavage Development Cleavage formation during thrusting Vertical compactionHorizontal cleavage Tectonic Shorteningvertical spaced cleavage More tectonic shorteningvertical slatey cleavage along axial planes SEM Image of Clays in Shale Pressure solution in Clay rich Limestone Spaced Pressure Solution Cleavage



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