Our estimates of pressures and temperatures experienced by rocks during metamorphism are based on metamorphic reactions Mineral Reactions There are two basic types of mineral reactions Continuous ID: 1021105
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1. Mineral ReactionsMineral reactions are the basis for much of our understanding of metamorphism.Our estimates of pressures and temperatures experienced by rocks during metamorphism are based on metamorphic reactions.
2. Mineral ReactionsThere are two basic types of mineral reactions:ContinuousDiscontinuous
3. Discontinuous ReactionsMinerals that are the products of reaction are different from the reactantsEx: Albite -> Jadeite + Quartz NaAlSi3O8 -> NaAlSi2O6 + SiO2Jadeite and Quartz are different from AlbiteGenerally make good geobarometers because they have a gentle slope on a P-T graph(after Liou, 1987)
4. Albite -> Jadeite + QuartzGeobarometerA good geobarometer has a gentle slope(after Liou, 1987)
5. Continuous ReactionsMinerals that are the products of reaction are the same as the reactants. Elements are exchanged between different mineralsEx: Fe-Mg exchange between garnet and pyroxeneFe-garnet + Mg-pyroxene -> Mg-garnet + Fe-pyroxeneFe3Al2Si3O12 + 3CaMgSi2O6 -> Mg3Al2Si3O12 + 3CaFeSi2O6 Generally make good geothermometers
6. Garnet-clinopyroxene geothermometerafter Krogh Ravna 2000A good geothermometer has a steep slope