Multiple fluid-rock interactions during the tectonothermal evolution of reworked UHT granulite: ca. 950 Ma to ca. 500 Ma history from a single lithoassemblage, Eastern Ghats Belt, India

Kaushik Das; Sankar Bose; Junji Torimoto; Yasutaka Hayasaka; Hiroharu Matsueda

doi:10.14824/jakoka.2013.0_194

2013 Annual Meeting of Japan Association of Mineralogical Sciences

Session ID : R8-02

DOI https://doi.org/10.14824/jakoka.2013.0_194

Conference information

Host: Japan Association of Mineralogical Sciences

R8: Metamorphic rocks and tectonics

Multiple fluid-rock interactions during the tectonothermal evolution of reworked UHT granulite: ca. 950 Ma to ca. 500 Ma history from a single lithoassemblage, Eastern Ghats Belt, India

*Kaushik Das, Sankar Bose, Junji Torimoto, Yasutaka Hayasaka, Hiroharu Matsueda

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Keywords: UHT Al-granulite, fluid inclusion, U-Pb SHRIMP, monazite CHIME dating, multiple fluid events

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Abstract

Here we report a wide spectrum of fluid chemistry during multiple events of fluid-rock interaction throughout the evolutionary history (~950 Ma to ~500 Ma) of lower crustal segment of the Eastern Ghats Belt. This study reveals entrapment of very high-density CO₂ fluid at the near-peak UHT metamorphic condition followed by at least two events of infiltration of carbonic fluids (mixed with vapor) at different crustal levels during reworking and eventual exhumation of this crustal segment up to the shallow depth. There is a possible resetting effect of fluids on the monazite and zircon dating.

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