metamorphicrock - Metamorphic Rocks Metamorphic Rocks...

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Unformatted text preview: Metamorphic Rocks Metamorphic Rocks Metamorphism: to change form. Metamorphic rocks: Solid state changes in texture or mineralogy to an existing rock. Metamorphic Processes: What Causes Change? 1) HEAT: increase in T o changes mineral stability . 2) PRESSURE: greater pressure tends to decrease space available : a) increases density b) creates foliation 3) FLUIDS (H 2 O): aids exchange of ions between growing crystals. Pressure and Temperature vs. Depth Pressure and Temperature vs. Depth Metamorphic Grade Intensity of metamorphism Low grade: low T , P; High grade: high T , P Depth, km 35 75 A s t h e n o s p h e r e C o n t i n e n t a l c r u s t Regional metamorphism Oceanic crust Oceanic lithosphere Shock metamorphism Regional metamorphism Regional high-pressure metamorphism Contact metamorphism Burial metamorphism C o n t i n e n t a l m a n t l e l i t h o s p h e r e Water Seafloor metamorphism Types of Metamorphism Types of Metamorphism Regional: Widespread changes in temperature and pressure. Types of Metamorphism Types of Metamorphism Contact : Intrusion of magma against cold rock (local phenomenon). Metamorphic Reactions 1) Mineralogical changes: a) new minerals b) size increases c) become denser 2) Textural changes: a) foliation - preferred orientation- wavy or parallel layering Metamorphic Foliation Metamorphic Foliation Perpendicular to Main Stress Perpendicular to Main Stress Metamorphic Foliation Metamorphic Foliation parallel layering or banding Pressure (kilobars)...
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metamorphicrock - Metamorphic Rocks Metamorphic Rocks...

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