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Metamorphic reaction

From Wikipedia, the free encyclopedia
Schematic representation of a metamorphic reaction. Abbreviations of minerals: act = actinolite; chl = chlorite; ep = epidote; gt = garnet; hbl = hornblende; plag = plagioclase. Two minerals represented in the figure do not participate in the reaction, they can be quartz and K-feldspar. This reaction takes place in nature when a mafic rock goes from amphibolite facies to greenschist facies.

A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one assemblage of minerals is transformed into a second assemblage which is stable under the new temperature/pressure conditions resulting in the final stable state of the observed metamorphic rock.[1]

Examples include the production of talc under varied metamorphic conditions:

serpentine + carbon dioxide → talc + magnesite + water
chlorite + quartzkyanite + talc + water
Epidotisation in Argyll and Bute, U.K

Polymorphic Transformations

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Exsolution Reactions

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Devolatilization Reactions

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Continuous Reactions

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Ion Exchange Reactions

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Oxidation/Reduction Reactions

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Reactions Involving Dissolved Species

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Chemographics

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Petrogenetic Grids

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Schreinemakers Method

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Reaction Mechanisms

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See also

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Notes

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  1. ^ "Types of Metamorphic Reactions". Tulane University. Retrieved 2007-06-22.