what does it mean to say that a metamorphic rock is high grade?

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03-11-2021
Geography

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what does it mean to say that a metamorphic rock is high grade?

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gehrigj2005 gehrigj2005 · Answer 1 · 2021-11-09T06:57:07+01:00

gehrigj2005 gehrigj2005

09-11-2021

High-grade metamorphism takes place at temperatures greater than 320oC and relatively high pressure. As grade of metamorphism increases, hydrous minerals become less hydrous, by losing H2O, and non-hydrous minerals become more common.

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