GEOL105_13 - Types of Metamorphism Contact metamorphism...

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Types of Metamorphism Contact metamorphism – rocks ithin the crust that are intruded by magma are  recrystallized  Two different environments where rocks get pressurized and metamorphosed.  One of them – magma chambers.  Contact metamorphic rocks in the roof of a granite pluton Rocks get cooked and recrystallized from the heat of the molten magma Regional metamorphism – as rocks are buried deeper and deeper ithin the earth  they encounter higher pressures (confining – lithostatic) and temperatures, which  result in their recrystallization; the directed pressures (stresses) produce planar  structures called foliation Diagram Regional metamorphism Basalt and its … Basalt – mafic lava. Forming alone mid ocean ridges and rises.  Pillow like cold lava. Stack of pillows. Basalt if reheated can be recrystallized that  look quite different from each other, like amphibolite – metamorphosed basalt.  Glaucophane Schist – metamorphosed basalt. Eclogite – metamorphosed at a  deeper level. Can form as deep as a 100 km below the earth. Temperatures are  pretty low there.  We can start out with one sort of rock, and with different pressures and  temperatures they recrystallize to different rocks with their own properties. Metamorphic realms Franciscan blueschist…
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Microscopic view of blueschist High concentration of sodium which gives them the blue color. Metamorphic rocks form under different pressures and temperatures, depending  on these conditions we can get different minerals. Some minerals are stable  under high pressures and some break down under high pressures.
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