Anukruti posted an Question
December 18, 2020 • 03:58 am 30 points
  • IIT JAM
  • Geology (GG)

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    Sajan sarthak Best Answer

    The Buchan Facies Series of regional metamorphism is characterized by the presence of andalusite, and sometimes cordierite, in intermediate grade mineral assemblages indicating that the conditions of metamorphism were at lower pressure and along a higher metamorphic field gradient than that recorded in Barrovian Facies Series metamorphic rocks . It's a Buchan zone minerals.... Barrovian will have chlorite>biotite> garnet>sturolite>kyanite>sillimanite

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    Saurabh 1 best-answer

    Most probable answer seems to be (B) Buchan series...... As Andalusite zone is absent in Barrovian facies series (Buchan facies series forms at lower pressure as compared to Barrovian facies series )... Also buchan facies marks the regional metamorphism and Consists of three metamorphic facies mainly Greenschist ( Chlorite zone), Amphibolite (Andalusite zone) and Granulite(Sillimanite zone)..

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