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Geo101.16.MetamorphicRxs - Exam II is Thursday November...

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1 Exam II is Thursday, November 12th review sheet is also online… Metamorphic Rocks Metamorphic rocks are a group of rocks that have undergone a transformation from their original state or form into a new state or form… without first becoming melt or sediment… …this implies that metamorphic rocks result from change while still in the solid state …metamorphism can replace a rock’s original group of minerals with a new group of minerals …and alter the rocks texture, size, shape and arrangement of grains …thus, a metamorphic rock can be dramatically different in appearance from the original rock (protolith) from which it was formed …note the compositional banding a Shale... …a Gneiss Metamorphism of a sedimentary rock Limestone Marble Another example, in thin section…
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2 What causes metamorphism? …metamorphism occurs when rocks are acted upon by one or combination of the following: 1) heat 2) hot groundwater 3) pressure 4) differential stress So, how can you tell you have a metamorphic rock and not a igneous or sedimentary rock? …not always a simple task.. …metamorphic rocks posses either a unique assemblage of minerals and / or some sort of metamorphic foliation or compositional banding (parallel layers or surfaces... unrelated to bedding seen in sedimentary rocks) 1) The formation of new crystals from previously existing crystals as a result of applied heat, and the breaking and forming new bonds is called… recrystallization …the rate of recrystallization increases with increased temperature Recrystallization by solid state diffusion…
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