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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
Where do magmas originate?
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Originate in the mantle
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Famous Yankee great
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In what 3 ways do magmas melt?
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1) Increase Temperature
2) Decompression melting 3) Flux Melting |
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What is "Flux Melting"?
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Introduce water to lower the melting point of the material
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lowers something
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What is decompression melting?
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release pressure due to stretching of lithosphere
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Characteristics of Intrusive rocks
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- deep underground
- slow cooling - coarse grained |
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Characteristics of Extrusive rocks
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- near surface
- cool rapidly - fine grained |
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Phaneritic
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- coarse grained
- large grains (seen with eye) |
big
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Porphoritic
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- 2 grain sizes
- phenocrysts embedded in smaller grains matrix |
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Aphanitic
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fine grained
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vesicular
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full of holes (gas bubbles)
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gassy
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glassy texture
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- no grains
- rapid cooling rate - commonly black |
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Ferromagnesian
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- more Fe and Mg present
- darker in color ex: Gabbro, Basalt |
see root words
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Non-Ferromagnesian
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- less Fe and Mg present
- more silica present - lighter color ex: Granite, Rhyolite |
see root words
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What is Magmatic differentiation?
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how magmas change composition to form different igneous rock types
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its in the name
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What ways does magmatic differentiation occur?
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1) Crystalization - cools and crystalizes
2) Assimilation - melts and combines with other rock 3) mixes with other magma |
3 ways
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