A New Occurrence of Sapphirine-Spinel-Corundum-Bearing Granulite from NE of Jagtiyal, Eastern Dharwar Craton, Andhra Pradesh

Authors

  • D. Prakash
     Centre of AdvancUed Study in Geology, Banaras Hind University, Varanasi - 221 005
  • P. Chandra Singh
     Centre of AdvancUed Study in Geology, Banaras Hind University, Varanasi - 221 005
  • T. Hokada
     National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518

Abstract

We report a new occurrence of sapphirine-spinel-corundum bearing granulites enclosed in granitic gneisses near Jagtiyal in the Eastern Dharwar Craton (EDC). These granulites are very important in deciphering the prehistory of the thermal peak of metamorphism due to the presence of refractory phases. The appearance of sapphirine is related to the following reactions: (a) Spl1 + Crd1 = Spr1 (2:2:1) (b) Phl (in Bt1) + Crn1 = East (in Bt2) + Spr2 (7:9:3) + Crd2 (c) Bt2 + Crd1 +Crn1 = Spr2(7:9:3) + Kfs + H2O (d) Crd1 + Spl1 + Crn1 = Spr2(7:9:3). The P-T evolution of these sapphirine granulites has been constrained through the use of THERMOCALC program. Temperature of formation of sapphirine-spinel assemblages is high, around 800 °C, and pressure ranges from 5-7 kbars, suggesting that sapphirine formation took place during decompression stage.

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Issue

Volume 82, Issue 1, July 2013

Section

Research Articles

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Published

2013-07-01

How to Cite

Prakash, D., Singh, P. C., & Hokada, T. (2013). A New Occurrence of Sapphirine-Spinel-Corundum-Bearing Granulite from NE of Jagtiyal, Eastern Dharwar Craton, Andhra Pradesh. Journal of Geological Society of India, 82(1), 5–8. Retrieved from http://www.geosocindia.com/index.php/jgsi/article/view/57493

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