Which mineral is typical of granulite facies metamorphism?

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Multiple Choice

Which mineral is typical of granulite facies metamorphism?

Explanation:
Granulite facies metamorphism is driven by very high temperatures with dehydration reactions, producing largely anhydrous mineral assemblages. A key mineral that forms under these extreme heat conditions is sillimanite, an aluminosilicate that appears in granulite rocks alongside pyroxenes and garnet. Its stability at high temperature makes it a hallmark indicator of granulite-grade metamorphism. In contrast, calcite, gypsum, and halite are minerals associated with surface or evaporitic conditions and do not define the high-temperature, dehydration environment of granulite facies. So, sillimanite best reflects the intense heat characteristic of granulite metamorphism.

Granulite facies metamorphism is driven by very high temperatures with dehydration reactions, producing largely anhydrous mineral assemblages. A key mineral that forms under these extreme heat conditions is sillimanite, an aluminosilicate that appears in granulite rocks alongside pyroxenes and garnet. Its stability at high temperature makes it a hallmark indicator of granulite-grade metamorphism. In contrast, calcite, gypsum, and halite are minerals associated with surface or evaporitic conditions and do not define the high-temperature, dehydration environment of granulite facies. So, sillimanite best reflects the intense heat characteristic of granulite metamorphism.

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