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(Top) 1 Polymorphic Transformations 2 Exsolution Reactions 3 Devolatilization Reactions 4 Continuous Reactions 5 Ion Exchange Reactions 6 Oxidation/Reduction Reactions 7 Reactions Involving Dissolved Species 8 Chemographics 9 Petrogenetic Grids 10 Schreinemakers Method 11 Reaction Mechanisms 12 See also 13 Notes

Metamorphic reaction

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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 faciestogreenschist facies.

Ametamorphic 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 + quartz → kyanite + talc + water