Slate(Metamorphic)
~ -low-grade metamorphism
-fine gained
- originally mudrocks, and volcanic ash
Phyllite (Metamorphic)
~ -glassy sheen an wavy texture
-more temp and pressure than slate
-Composed mainly of fine crystals of muscovite and chlorite
Schist(Metamorphic)
~ -Medium to coarse gr...
✓✓✓✓~ A mass of rock formed when a large body of magma cools inside the crust
Laccolith
✓✓✓✓~ A local intrusive body with other rocks below(fed by dykes)
Examples of Batholiths
✓✓✓✓~ Sieraa nevada, Coast range on the west coast
Laccoliths examples
✓✓✓✓~ Devils tower(Wyoming), Mount Royal(montreal)
Torres del paine(chile)
What are magam 3 components
✓✓✓✓~ Melt(the liquid portion composed of mobile ions)
Solids(If any are silicate minerals that have already crystallized from the melt)
, Volatiles(gases dissolved in the melt like H2O, CO2 SO2) violitiles make magma
rise faster and change how it behaves
geothermal gradient
✓✓✓✓~ the gradual increase in temperature with depth in the crust on average 25 degrees
per km
Rocks in the lower crus and upper mantle are between what temperatures
✓✓✓✓~ 1500-2500 degrees
What 3 causes cause melting to beginning
✓✓✓✓~ Confining pressure drops slightly, Temperature increased, volatiles are introduced
What is decompression melting
✓✓✓✓~ melting due to a drop in confining pressure that occurs as rock rises
What is crystallization?
✓✓✓✓~ Cooling magma results in the systematic arrangement of ion into crystal structures.
What is a mantle of composed of peridotite rich of?
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