Geo101.16.MetamorphicRxs[1] - Metamorphic Rocks Metamorphic...

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1 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 Frst 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… 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
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2 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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This note was uploaded on 04/03/2011 for the course GEOLOGY 939 taught by Professor Swisher during the Spring '11 term at Rutgers.

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Geo101.16.MetamorphicRxs[1] - Metamorphic Rocks Metamorphic...

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