Term
Intrusive Igneous Rock
Extrusive Igneous Rock |
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Definition
Intrusive- rock that cools and crystallizes within the Earths crust
Extrusive- rock that cools and crystallizes on the Earths surface |
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Term
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Definition
Is the average: 25C/km times a number given
ie: The average Geothermal Gradient is 25C/km, what would the approximate temp. be at 20km depth?
25km x 20km= 500 |
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Term
| Two igneous rocks that have the same chemical compostion as Granite, but are not mineralogically equivalent are: |
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Definition
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Term
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Definition
Silica content of > 70%
White, Pink, Light Gray, Red, or Purple
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Term
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Definition
Silica ~50%
Dark Gray to Black |
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Term
| Intermediate Igneous Rock |
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Definition
Silica ~60%
Medium-Dark Grey, Dark Green, Purple |
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Term
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Definition
Silica ~40%
Black (Green-Brown if olivine only) |
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Term
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Definition
| massive, cuts across surrounding country rock |
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Definition
tabular, cuts across surrounding country rock
(discordant pluton) |
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Definition
| tabular, parallel to surrounding country rock |
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Term
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Definition
| mushroom-shaped, parallel to surrounding country rock (concordant pluton) |
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Term
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Definition
| physical disintegration of minerals and rocks into smaller pieces |
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Term
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Definition
| decomposition of minearals and rocks into new substance |
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Term
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Definition
| Molten rock that occurs within the Earth's crust |
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Term
Classification:
Clastic
Chemical |
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Definition
Clastic- terms of size
Chemical-mineral composition
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Term
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Definition
- Bedding
- Cross Bedding
- Graded Bedding
- Mudcracks
- Ripple Marks
-Asymmetrical formed by one-directional current
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Term
Continental Depositional Environments
Transitional Depositional Environments
Marine Depositional Environments |
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Definition
C=Alluvial Fan,Stream CHannel, Floodplain,Desert,Glacial,Lake,Cave
T= Delta,Beach,Lagoon
M=Continental Shelf, Reef, Sea Fan, Deep Sea Oozes, Deep Sea Muds |
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Term
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Definition
| textural, mineralogical, or chemical changes that take place in the Solid state in respose to changes in Pressure and Temperature |
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