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10 Cards in this Set
- Front
- Back
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Mafic |
Low viscosity, high temp, low gas (silica), non-explosive eruptions, high Mg & Fe, Shield/Cinder cone, Sills & dikes = intrusions |
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Intermediate composition |
Normal silica (gas)/Mg/Fe levels, medium temp, normal viscosity, Cinder cone/composite cone, intrusions = volcanic necks (andesite) |
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Felsic composition |
High silica, low Mg & Fe, low temp, high viscosity, Caldera, Batholiths & Laccoliths = intrusions |
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Vesicular texture of IG rocks |
Rapid cooling, but where bubbles escape (porous basalt) |
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Pyroclastic texture of IG rocks |
Angular rock fragments, cement between = volcanic ash |
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Detrital sedimentary rock texture |
Form from deposition & lithification of sediments weathered from pre-existing rocks (clastic (broken) appearance |
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Chemical sedimentary rock texture |
Form from chem. rxn in environment, or predominantly organic remains |
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Foliated metamorphic rock texture |
Distinct layers of minerals |
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Relative dating |
Rocks placed in correct sequence/order, doesn't tell age |
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Law of superposition |
In undeformed sequence of SED rocks, each bed is older than the one above it |
