Metamorphism, metamorphic rocks, and hydrothermal rocks (2)
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Metamorphic
Rock
Classification
Metamorphic Rock
Textures
Textural Responses to Changes in Metamorphic Temperature-Pressure
Foliated Textures
Slaty Cleavage
Sedimentary layers have just
undergone folding
Now the slaty cleavage
has developed as the
clay in the shale has
transformed into the
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Slaty Cleavage
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Slaty Cleavage
Foliated
Textures
Slaty Cleavage
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Slaty Cleavage and its Practical Applications
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Slaty Cleavage and its Practical Applications
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Foliated
Textures
Schistosity and
Mineral Banding
develops
into
Which then
Develops into
Foliated Textures - Schistosity
A foliation is any planar fabric in a metamorphic
rock. In this case, the foliation is defined by aligned
sheets of muscovite sandwiched between quartz
grains.
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Foliated Textures - Schistosity
Schist
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Foliated Textures – Mineral Banding
Gneiss
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Foliated Textures – Mineral Banding
Gneiss
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Foliated Textures – Mineral Banding
Gneiss
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Foliated Textures – Mineral Banding
Gneiss
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Foliated Textures – Mineral Banding
Gneiss
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Textural Responses to Changes in Metamorphic Temperature-Pressure
Quartz sandstone – pure silica
Limestone – pure CaCO3
Granular Textures
Metamorphic Rock Classification and Formation
Metamorphic Rock Classification and Formation
The trouble with
metamorphism is . . .
Any kind of rock, igneous,
sedimentary, or
metamorphic . . .
Can undergo any kind of
metamorphism . . .
Producing every conceivable
combination and permutation.
Metamorphic Rocks are Very
Complex
Barrovian Metamorphism
Shale
Slate
Metamorphoses
Into
Clay
Sedimentary
Silica
Bedding
Iron
oxides
Dull “thunk” sound when
struck
Small
chlorite
crystals
Slaty
cleavage
Rings like a bell when struck
