Lab 5 Chapter Slides

Lab 5 Chapter Slides - Metamorphism is the solid-state...

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Unformatted text preview: Metamorphism is the solid-state transformation of pre- existing rock into texturally or mineralogically distinct new rock as the result of high temperature, high pressure , hydrothermal fluids or any combination of the above . The Rock Cycle The Rock Cycle Parent rock- Protolith Parent rock- Protolith Metamorphic rocks typically have the Metamorphic rocks typically have the same chemical composition as the rock same chemical composition as the rock they were formed from. they were formed from. Different minerals, but made of the same Different minerals, but made of the same elements. elements. Shale Slate Metamorphic rocks Metamorphic rocks When rocks are baked by heat of molten magma or When rocks are baked by heat of molten magma or squeezed by the movements of huge tectonic plates or squeezed by the movements of huge tectonic plates or by the pressure of overlying thick succession of rocks by the pressure of overlying thick succession of rocks They are altered or changed beyond recognition i.e. change in texture, structure, or mineral content. Metamorphic rocks Metamorphic rocks Metamorphism Metamorphism Is the process that occur in rocks Is the process that occur in rocks due to the effects of due to the effects of High temperature High temperature High pressure High pressure Hydrothermal fluids Hydrothermal fluids The Concept of Geothermal Gradient Temperature increases with depth at a rate of 20-30 o C/km in the crust. Temperature Deeper in Crust A B The source of temperature is either from magma or due to The source of temperature is either from magma or due to the depth factor the depth factor Metamorphism usually results in changes in mineral Metamorphism usually results in changes in mineral composition and texture of rocks (Igneous and composition and texture of rocks (Igneous and Sedimentary) which are subjected to Sedimentary) which are subjected to temperatures temperatures > 100 > 100 C C and pressure > 1000s Mpa. and pressure > 1000s Mpa. Low-grade metamorphism: Low-grade metamorphism: Occurs at about 100 Occurs at about 100 C to 500 C to 500 C. C. High-grade metamorphism: High-grade metamorphism: Occurs at > 500 Occurs at > 500 C C Temperature Temperature 0 km Sedimentary rock Metamorphic rock Igneous rock 50 km 10 km ~200C ~800C Increasing depth and temperature Melting Metamorphism Sedimentary rock Sediment Metamor- phism occurs between about 10 and 50 km of depth Contact Metamorphism...
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Lab 5 Chapter Slides - Metamorphism is the solid-state...

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