Anukruti posted an MCQ
October 11, 2020 • 18:59 pm 30 points
  • IIT JAM
  • Geology (GG)

Most robust textural evidence of ultra high pressure metamorphism is

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    Rahul kumar best-answer

    Pyrope+Coesite is indicator of ultra high pressure metamorphism. Coesite is very high pressure polymorph of silica that's why it occurs in high pressure condition.

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    In case of ultra high temperature (UHT) metamorphism you will get sapphirine+Quartz assemblage but in question you have asked about ultra high pressure (UHP) metamorphism. That's why Coesite+pyrope should be answer.

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    ok sir thank you.

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    Sajan sarthak Best Answer

    Garnet and coesite a great combination of ultra high pressure Sapphirine can also be added but in granulite facies it's mostly temperature dominant we consider ...and simple quartz is given so I choose the high pressure variety coesite. Spinel–sapphirine–quartz bearing composite inclusion within garnet from an ultrahigh-temperature pelitic granulite: Implications for metamorphic history and P–T path

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