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Geol 101 Metamorphism Cont

Geol 101 Metamorphism Cont - Geol 101 Metamorphism 12:40:00...

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Geol 101 Metamorphism  11/10/2007 12:40:00 Regional Metamorphism Both mechanical deformation and chemical recrystallization due to plate  tectonics Temperature and pressure correlated – Greenschist o Chlorite  Low temperature, high pressure – Blueschist o Glaucophane Result of tectonic processes Pressure, temperature, correlated (c-c) collision In continental collisions zones, regional metamorphism is burial  metamorphism gone wild In Subduction zones, high pressure and low temperature creat a distinctive  metamorphic facies called blueschist (6.28) o Very very rare o Tend to capture at the surface of the earth  o The way you see them is when other bigger pieces of c-crust get  involved in the Subduction zone o Obduction – duction on rather than under Types of Metamorphism Hydrothermal metamorphism occurs mainly at mid-oceanic ridges o Fig 6.25
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