• Domainal fabric development, associated microstructures and P-T records attesting to polymetamorphism in a granulite complex of the Eastern Ghats granulite belt, India

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    • Keywords

       

      Eastern Ghats granulite belt; polyphase deformation; distinct fabrics; diverse P–T records; polymetamorphism.

    • Abstract

       

      The granulite complex around Jenapore, Orissa, Eastern Ghats granulite belt, bears the imprint of two episodes of strong deformation (D1 and D2) attended with foliation (fabric) development ($S_1$ and $S_2$). Two distinct metamorphic events at P-T conditions of ∼900° C at ∼9$kbar$ and ∼600° C at ∼6 $kbar$ are correlated with D1 and D2 respectively. The reaction textures in S1-microdomains are interpreted to be the product of near isobaric cooling at ∼9 $kbar$ from 950° C to 600°C, whereas those in the $S_2$-microdomains are considered to be the result of an up-pressure trajectory from ∼6 kbar at 600°C. The D1-M1 high P-T granulite event is interpreted to be Archean in age (ca. 3Ga) on the basis of the isotopic data obtained from the charnockite suite of the area. The later relatively low P-T granulite facies event, attendant to D2-S2 is considered to be related to the Grenvillian orogeny as represented by the dominant isotopic record in the belt.

    • Author Affiliations

       

      Rajib Kar1

      1. Department of Geology, J. K. College, Purulia 723 101, West Bengal, India.
    • Dates

       
  • Journal of Earth System Science | News

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