Lec7 - University of California, Berkeley Civil Engineering...

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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 7 9/18/07 Metamorphic Rocks Metamorphic Grade / Facies Classification Foliation Regional versus contact Pressure / Temperature Variations in Crust Meta + Morph Change + Form The pressure in the crust o There isn’t that much of fluctuation Subduction zones has a bit more pressure Spreading zones has less pressure But pressure mostly caused by depth o Temperature 1300° C starts to melt rocks and recrystallize Does fluctuate quite a lot 1300° C line fluctuate where there is crust thinning and thickening Usually occurs at mountain ranges High geothermal gradient in thin crust areas o Conversely, low geothermal gradient in thick crust areas o As you go deeper in mines, it actually gets warming South Africa has some of the deepest mines in the world Workers must undergo training to work at high temperatures
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Lec7 - University of California, Berkeley Civil Engineering...

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