Download - Metamorphic Rocks Foliations, and Lineations
![Page 1: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/1.jpg)
![Page 2: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/2.jpg)
Metamorphic Rocks Foliations, and Lineations
![Page 3: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/3.jpg)
Topics• Fabrics• Foliation, cleavage, lineation
– Cleavage and Folds– Geometry– Strain significance
• Origin of Cleavage– Pressure solution– Passive rotation– Recrystallization
• Shear zones
![Page 4: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/4.jpg)
Geothermal Gradient and Metamorphism
![Page 5: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/5.jpg)
Naming of Metamorphic Rocks
![Page 6: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/6.jpg)
Slatey cleavage
![Page 7: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/7.jpg)
Gneiss
![Page 8: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/8.jpg)
Looks Like Bedding, but is it?
![Page 9: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/9.jpg)
Metamorphic layering
Broosk Range, AK
![Page 10: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/10.jpg)
Isoclinal Fold
![Page 11: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/11.jpg)
Quartz-mica schist
![Page 12: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/12.jpg)
Fabric Elements•Bedding
•Compositional layering
•Mineral grains
•Fold Hinges
•Axial planes
•Planes of parting or fracture
•etc
![Page 13: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/13.jpg)
Metamorphic Fabrics• Foliation
– Cleavage– Schistosity
• Lineation
S-tectonite L-tectonite L/S-tectonite
![Page 14: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/14.jpg)
Random fabric
Foliation
Lineation
![Page 15: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/15.jpg)
Penetrative Fabric
Spaced Fabric
![Page 16: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/16.jpg)
Cleavage• A kind of foliation
• Deformation Fabric
• Rock splits along preferred planes
Lachlan fold belt, AustraliaPhoto by E.L.Miller
![Page 17: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/17.jpg)
Spaced cleavage
Cambrian Rocks, South Verkhoyansk foldbelt, Siberia
![Page 18: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/18.jpg)
The beginning of Metamorphism:
Axial Planar Cleavage
![Page 19: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/19.jpg)
![Page 20: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/20.jpg)
![Page 21: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/21.jpg)
Relationship o cleavage to folding
Axial-planar cleavage
![Page 22: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/22.jpg)
![Page 23: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/23.jpg)
Axial Planar cleavage
![Page 24: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/24.jpg)
Processes of Cleavage Development
• Rotation of minerals
• Crenulation
• Pressure solution
• Recrystallization
![Page 25: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/25.jpg)
SEM Image of Clays in Shale
![Page 26: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/26.jpg)
Pressure solution in Clay-rich Limestone
![Page 27: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/27.jpg)
Early pressure-solution cleavage in limestone
![Page 28: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/28.jpg)
Small quartz vein cut by a spaced crenulation/solution cleavageDocumenting the extent of material removal along these surfaces. Photo from David Gray, Monash University, Australia
![Page 29: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/29.jpg)
Sequential diagram of % shortening by folding (initially by buckling), cleavage development and dissolution. Courtesy of David Gray, Monash University, Australia
![Page 30: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/30.jpg)
![Page 31: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/31.jpg)
Sandstone after compaction
![Page 32: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/32.jpg)
Beginning of foliation
![Page 33: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/33.jpg)
Crenulation Cleavage
Small scale kinks and pressure solution surfaces
![Page 34: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/34.jpg)
Crenulation Cleavage Beginning
![Page 35: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/35.jpg)
More Advanced Fabric
![Page 36: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/36.jpg)
Coarse Sandstone-Strong Foliation
![Page 37: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/37.jpg)
Two Foliations!
S2
S1
![Page 38: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/38.jpg)
Spaced Pressure-Solution Cleavage
![Page 39: Metamorphic Rocks Foliations, and Lineations](https://reader036.vdocuments.us/reader036/viewer/2022062322/568151d8550346895dc0138c/html5/thumbnails/39.jpg)
Shortening by folding vs. shortening by cleavage