CJ Geology Lab #6 Igneous Rocks and Volcanism
Terms in this set (19)
What mineral composition is most characteristic of felsic rocks?
orthoclase, quartz, and biotite
What mineral composition is most characteristic of mafic rocks?
olivine, pyroxene, and calcium-rich plagioclase
What mineral composition is most characteristic of intermediate rocks?
sodium-rich plagioclase and hornblende with some quartz or biotite
When mafic lava breaks through fissures in the continent crust, which of the following often results?
Which scenario is associated with mafic magma?
hot, fluid lava that forms a shield volcano
Which scenario is associated with felsic magma?
an explosive eruption that ejects pyroclastic materials
Wizard Island in Crater Lake, Oregon, is an example of a
A porphyritic rock forms when
there is a period of slow cooling, followed by more rapid cooling.
A porphyritic rock contains both ________ and __________.
Rock Sample #1
formed slowly underground from felsic magma
Rock Sample #2
crystallized from felsic magma
Rock Sample #3
Rock Sample #4
It formed quickly on the surface from felsic lava
Rock Sample #6
formed from felsic lava as gas bubbles escaped
Rock Sample #7
a phaneritic texture
crystallized from an intermediate magma
Rock Sample #8
intermediate igneous rock
Rock Sample #9
crystallized from mafic magma
Rock Sample #10
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