Metamorphic Rocks

Jun 30th, 2015
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How would you know? -contain meta minerals; mins that only happen because of memorphing -has memorph texture from grain arrangement -memorph foliation: parallel alignment of platys or presence of alternating layers

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8. Metamorphic Rocksfirst dude: James Huttonformed when protolith goes through solid-state change in response to modification of environmentHow would you know?-contain meta minerals; mins that only happen because of memorphing-has memorph texture from grain arrangement-memorph foliation: parallel alignment of platys or presence of alternating layersFormation happens from various processes, sometimes they happen together:-recrystallization: changes grain shape/size without changing identity-phase change: change one min to another min with same comp but different structure. Rearrangement of atoms-memorph reaction/neo-crystallization: chemical reactions digest the protolith and make new mins of the memorph rock. Atoms migrate through solid crystals??-pressure solution: wet rock is squeezed more strongly in one direction-plastic deformation: rock is squeezed/sheared at high temp/pressure. Mins become soft and change shape w/o breaking.Memorphing due to heatingmemorphing happens usually from heat, temps 250C 850C. But comp/water can change that, so it could be more like 650C 1200C. Depth at which this occurs depends on how close you are to hot things.Memorphing from pressurepressure: stress from all sidesPack mins together, and you get denser mins! Phase change/neocrys. Average is 12 kbar, or 12000x pressure of earth's surface.Changing Pressure and Temp TogetherDifferent memorph mins will form from the same protolith at different deltas of press

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