Gurmeet singh Asked a Question
December 30, 2020 4:09 pmpts 30 pts
(BHU-2010 . Muscovite + Quartz K-feldspar + AL,SiO, + H,O (water pressure <3.5 kb) defines: A. Beginning of very low grade metamor phism B. Beginning of low grade metamorphism C. Beginning of medium grade metamorphism D. Beginning of high grade metamorphism (BHU-2010)
  • 3 Answer(s)
  • like-1
  • Shares
  • Owishi Sarkar thankyou
    The correct answer is D). This is a very important reaction also known as second sillimanite isograd or also muscovite out reaction. This reaction mainly takes place at high temper...
    Show more
    Likes(1) Reply(0)
  • Rahul pandey Best Answer
    Answer (D) Beginning of high grade Metamorphism Disappearance of Muscovite and appearance of K-spar marks the beginning of high grade Metamorphism. Kindly refer to the attached fi...
    Show more
    • cropped1139807028536491233.jpg
    Likes(1) Reply(0)
  • Saurabh shukla thankyou
    Correct answer would be (D) ... As the metamorphic grade increases, minerals tend to loose water and they become less hydrous by loosing water through dehydration as shown in the ...
    Show more
    Likes(1) Reply(0)