chapter 6 - Grotzinger Jordan Press Siever Understanding...

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Understanding Earth Chapter 6: METAMORPHISM Modification of Rocks by Pressure Grotzinger • Jordan • Press • Siever Gneiss
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The Rock Cycle
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Definitions Metamorphic Rock : A rock whose original mineralogy, texture and/or composition has been changed due to pressure, temperature and/or fluids Metasomatic Rock : A metamorphic rock whose bulk chemical composition was altered during interaction with fluids Sequoia National Forest, California Metamorphism and Deformation
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Changes Metamorphism causes two major changes: 1) Mineralogical changes (minerals are generally stable over restricted temperature and pressures) 2) Textural changes (coarser grained with higher temperatures)
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Mineralogical change Fine Grained Mudstone (kaolinite dominates) Garnet-bearing Gneiss muscovite-biotite-garnet
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New minerals Talc* Epidote* Chlorite* Andalusite* Sillimanite*
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Changes Burgess Shale Gneiss Changes may be isochemical !! Rock remains solid
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This note was uploaded on 07/13/2009 for the course GEO 80355 taught by Professor Kyle during the Spring '09 term at University of Texas at Austin.

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chapter 6 - Grotzinger Jordan Press Siever Understanding...

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