Slideshow 101.15 Metamorphism

Slideshow 101.15 Metamorphism - Metamorphic Rocks...

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Unformatted text preview: Metamorphic Rocks Metamorphic Rocks Change in the solid state Metamorphic Rocks What is this stuff, anyway? Ea rly G e o lo g is ts unde rs to o d ho w s e dim e nta ry ro c k fo rm e d – the y c o uld o b s e rve s e dim e nta ry ro c k b e ing fo rm e d. They could see lava cooling and understood where igneous rock came from. These other rocks looked different and had unusual minerals in them – how did they form? …then they correlated metamorphic rocks with their unaltered equivalents… Metamorphic Rocks Metamorphic rock is the result of the transformation of a pre- existing rock type… either sedimentary rock, igneous rock or another older metamorphic rock (the pre-existing rock is a “protolith”). Some “foliated” (layered) metamorphic rocks… Slate Phyllite Schist Gneiss Migmatite Metamorphic Rocks Metamorphism …How they form He at, pre s s ure , and c he m ic a l re ac tio ns de e p within the Ea rth a lte r the m ine ral c o nte nt a nd/o r s truc ture o f pre e xis ting ro c k without melting it Any rock (igneous, sedimentary, metamorphic) can be metamorphosed Some atomic bonds are broken so atoms and ions can rearrange themselves into new minerals. If all the atomic bonds break, the rock would melt. Metamorphic Rocks Metamorphism De rive d fro m o lde r ro c ks thro ug h solid-state crystallization . Do e s not invo lve a s ig nific a nt m e lt pha s e . The lack of melting dis ting uis he s ig ne o us fro m m e ta m o rphic pro c e s s e s – if the ro c ks we re to m e lt a nd re - c rys ta llize , the y wo uld b e ig ne o us ro c ks . Metamorphic Rocks Metamorphism 1.Less stable minerals will become more stable minerals. For instance, Clay transforms into...
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This note was uploaded on 04/11/2008 for the course GEOL 101 taught by Professor Winstonnorrish during the Fall '07 term at Central Washington University.

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Slideshow 101.15 Metamorphism - Metamorphic Rocks...

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