metamorphic fabric
TRANSCRIPT
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Fabrics: Foliation and LineationsThere are both tectonic and primary fabricshere are both tectonic and primary fabrics
Random Fabrics Preferred Orientation
Foliation Lineation
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TectonitesR k ith t ti t t i f b iocks with a penetrative tectonic fabric
L t t it f b i d i t d b t t i-tectonite: fabric dominated by a tectoniclineationS-tectonite: fabric dominated by a tectonic
foliationLS-tectonite: general term for a rock with
both a foliation and a lineationoth a foliation and a lineationLS-tectonite: lineation strongerSL-tectonite: foliation stronger
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Tectonic Foliation
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Cleavage Classification
{Compositional
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Spaced Cleavage
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Disjunctive Foliation
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Pencil Cleavage
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Continuous FabricsAll i l fl tt d t t d i t ll lill minerals flattened or rotated into parallelism
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Continuous FabricsAll i l fl tt d t t d i t ll lill minerals flattened or rotated into parallelism
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Continuous Fabrics
C Fineoarse Fine
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Slaty Cleavage
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Slaty Cleavage Formation ~ 250-350oC
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Phyllitic Cleavage ~ Lower Greenschist facies
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Phyllitic Cleavage and Schistosity ~ greenschist facies
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Phyllitehyllite
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Shistosity ~ middle greenschist facies
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Axial Planar Cleavage
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Fanned Cleavage
Cleavage Early Layer Parallel ShorteningCleavage Perpendicular to Bedding
gRefractionCleavage Perpendicular to Bedding
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Cleavage Refraction
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Cleavagesteeper thanbedding
Beddingeddingsteeper thancleavage
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Crenulation Cleavage
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Crenulation Cleavage
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1 M h i l fl tt i f iHow Foliations Develop
1. Mechanical flattening of grains
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1 M h i l fl tt i f iHow Foliations Develop
1. Mechanical flattening of grains
dissolutionreprecipitation
Rieckes Principle
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1 Mechanically flattening grainsHow Foliations Develop
1. Mechanically flattening grains
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2 R t tiHow Foliations Develop
2. Rotation
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3 CrystallizationHow Foliations Develop
3. Crystallization
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4 T itiHow Foliations Develop
4. Transposition
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4 T itiHow Foliations Develop
4. Transposition
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Differentiated layering
5. Inheritance of layered fabric
Gneissic Banding
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6. Pressure-solution cleavage
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to
oma
gF
lea
iveC
juDs
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Disjunctive cleavage spacing is a function of initial clay content
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Lineations
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1. Slickensidesfibrous
grooves
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2. Fold lineation
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3. Intersection Lineation
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4. Mineral Lineations
elongate grains
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4. Mineral Lineations
lineation and just a lineationineation andfoliation just a lineation
tabular grains e.g. feldspars
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5. Other Markers
e.g. pebbles, fossils
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5. Other Markers
e.g. reduction spots, ooids, burrows, etc.
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5. Other Markersoblate particles
foliation only
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5. Other Markersprolate particles
lineation or foliation but not both
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6. Boudins
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6. Boudins
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6. Boudins
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6. Boudins
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7. Mullions