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21 Cards in this Set

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  • Back
What is another name for an intrusive igenous rock?
plutonic
igneous rocks comprise what percent of the volume of continental crust?
65%
what are most of the volatiles in magma?
H20 and C02
What is the order of bowen's discontinuous reaction series?
olivine
pyroxene
amphibole
biotite

residual minerals:
potassium feldspar
muscovite
quartz
Mafic rocks are rich in...
Fe, Mg, Ca
Felsic rocks are rich in....
K, Na
Mafic rocks are associated with the minerals...
olivine, pyroxene, Ca-rich feldspar
Intermediate rocks are associated with the minerals...
amphibole, biotite, Ca, Na feldspar
Felsic rocks are associated with the minerals...
biotite, quartz, K-spar, Na-rich feldspar, muscovite
Are phaneritic rocks intrusive or extrusive?
intrusive
Are aphanitic rocks extrusive or intrusive?
extrusive
What is the cooling history of phaneritic rocks?
slow cooling rate
What is the cooling history of aphanitic rocks?
rapid cooling rate
What is the cooling history of porphyritic aphanitic rocks?
two stages of cooling
1. slow
2. rapid
What is the cooling history of glassy rocks?
rapid cooling of a silica-rich magma
What is the cooling history of vesicular rocks?
rapid cooling of a magma in which the volatiles had started to separate
What is the cooling history of pyroclastic rocks?
explosive volcanic eruptions
What are the three aphanitic rock types and where are they found?
rhyolite (C)- felsic
andesite (V)- intermediate
basalt (H/O)- mafic
What are the three phaneritic rock types and where are they found?
granite (C)- felsic
diorite (V)- intermediate
gabbro (H/O)- mafic
What are the three vesicular rock types and where are they found?
pumice (H)- felsic
scoria (H)-intermediate
vesicular basalt (H)-mafic
What are the possible compositions of obsidian and what is its texture?
felsic or intermediate, it is glassy