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21 Cards in this Set
- Front
- Back
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What is another name for an intrusive igenous rock?
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plutonic
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igneous rocks comprise what percent of the volume of continental crust?
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65%
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what are most of the volatiles in magma?
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H20 and C02
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What is the order of bowen's discontinuous reaction series?
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olivine
pyroxene amphibole biotite residual minerals: potassium feldspar muscovite quartz |
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Mafic rocks are rich in...
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Fe, Mg, Ca
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Felsic rocks are rich in....
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K, Na
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Mafic rocks are associated with the minerals...
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olivine, pyroxene, Ca-rich feldspar
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Intermediate rocks are associated with the minerals...
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amphibole, biotite, Ca, Na feldspar
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Felsic rocks are associated with the minerals...
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biotite, quartz, K-spar, Na-rich feldspar, muscovite
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Are phaneritic rocks intrusive or extrusive?
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intrusive
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Are aphanitic rocks extrusive or intrusive?
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extrusive
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What is the cooling history of phaneritic rocks?
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slow cooling rate
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What is the cooling history of aphanitic rocks?
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rapid cooling rate
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What is the cooling history of porphyritic aphanitic rocks?
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two stages of cooling
1. slow 2. rapid |
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What is the cooling history of glassy rocks?
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rapid cooling of a silica-rich magma
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What is the cooling history of vesicular rocks?
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rapid cooling of a magma in which the volatiles had started to separate
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What is the cooling history of pyroclastic rocks?
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explosive volcanic eruptions
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What are the three aphanitic rock types and where are they found?
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rhyolite (C)- felsic
andesite (V)- intermediate basalt (H/O)- mafic |
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What are the three phaneritic rock types and where are they found?
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granite (C)- felsic
diorite (V)- intermediate gabbro (H/O)- mafic |
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What are the three vesicular rock types and where are they found?
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pumice (H)- felsic
scoria (H)-intermediate vesicular basalt (H)-mafic |
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What are the possible compositions of obsidian and what is its texture?
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felsic or intermediate, it is glassy
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