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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