Metamorphism and Metasomatic Fluids.
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v 0045 of 'Metamorphism and Metasomatic Fluids' by Greg Pouch at 2011-01-19 19:33:12 LastSavedBeforeThis 2011-01-19 19:31:02
C:\Users\GregAdmin\Documents\Geo101\06Metamorphism.ppt on 'GWPOUCHDELL1720'
3 Metamorphic Processes
4 Products > Metamorphic Textures
5 Products > Minerals and Metamorphic Grade
6 Circumstances of Metamorphism
7 Circumstances of Metamorphism Figures
8 Metamorphism and Plate Tectonics
9 Map of Metamorphic Regions
10 Classification of Metamorphic Rocks
11 Hydrothermal or Metasomatic Fluids > Sources
12 Hydrothermal/Metasomatic Fluids > Processes and Products
Minerals formed under one set of conditions (P, T, and chemistry) might not be stable under a different set of conditions. Just as some minerals are more stable in the low-temperature, low-pressure, oxidized, slightly acidic conditions at the surface, other minerals are favored at high temperatures, pressures, and bizarre chemistry found at depth and near intrusions. Metamorphism is a kind of opposite to weathering.
Metamorphism involves growth or formation of new mineral grains, usually under high P,T conditions. Because these conditions often include differential stress, the minerals can develop preferred orientations and fabric.
Planar Textures and
Foliation ( an oriented fabric marked by the alignment of platy minerals, usually micas)
MagmaProducts > Minerals and Metamorphic Grade
From http://www.bbc.co.uk/news/science-environment-12249909 Report: Urgent action needed to avert global hunger (bad article but good map)