EARTH232 Study Guide - Final Guide: Shock Metamorphism, Fluid Inclusions, Diagenesis

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Document Summary

Agents of metamorphism and type of metamorphism and how they relate to each other. Temp and pressure, fluids, stresses, relate to the type of metamorphism (regional, contact, etc) zone vs facies concept (proliths etc) Temperature: depth, geothermal gradients, adds energy (more pressure, high t low p (rift, extension conditions, low density minerals created, adding energy to the system will help overcome kinetic barriers in the aim of driving reactions to reach equilibrium. This promotes recrystallization (increases grain size) and consumes unstable minerals and produces new minerals that are stable. Pressure: lithostatic pressure is uniform and equal in all directions, but these normal gradients can be disturbed in certain tectonic environments, changing pressure: High t and low p = formation of low density metamorphic minerals (such as in rifting) Low t and high p favors the formation of denser minerals such as garnets which usually occur in subduction zones.