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Ishita Das posted an Question
November 27, 2020 • 00:14 am 30 points
  • IIT JAM
  • Geology (GG)

2. which of the following assemblage is high temperature high pressure regional metamorphism?

2. Which of the following assemblage is high temperature high pressure regional metamorphism? Glaucophane+ lawsonite+ chlorite+ epidote b. Omphacite+ garnet+ kyanite C. Chlorite+ albite+ epidote+ actinolite d. Orthopyroxene+ clinopyroxene+ plagioclase+ garnet

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    Rahul kumar

    Feel free to ask if you have any further queries related to this question

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    Rahul kumar best-answer

    You should read the question completely. The word "regional Metamorphism" indicates specific Metamorphic series starting from zeolite (low P low T) and ending at Granulite (High P and High T). Eclogite facies doesn't come under this series so that shouldn't be the answer. The correct answer should be "Granulite" facies minerals assemblage.

  • comment-profile-img>
    Rahul kumar

    Answer: (d) Opx + Cpx + plagioclase + garnet High temperature high pressure condition is related to Granulite facies. The characteristics minerals assemblage of Granulite facies is Opx + Cpx + Plagioclase + Hornblende + Olivine. So the correct Option should be d.

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    But isn't high pressure high temperature Eclogite facies. Since the characteristic minerals are absent for that facies in the option shouldn't we consider blueschist facies?

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