New Occurrence of Sapphirine-spinel-bearing Granulite from NW of Chilka Lake, Eastern Ghats Belt, Odisha

Prakash, D and Vishal, B and Naik, AS and Yadav, R and Rai, SK and Tewari, S and Yadav, MK and Tiwari, S and Dash, S and Pattnaik, C (2019) New Occurrence of Sapphirine-spinel-bearing Granulite from NW of Chilka Lake, Eastern Ghats Belt, Odisha. In: Journal of the Geological Society of India, 93 (2). pp. 153-156.

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Abstract

A new locality of sapphirine-spinel-bearing granulites from the Kaithapalli area which lies NW of Chilka Lake, Odisha is reported. The area tectonically forms a northern part of Eastern Ghats belt. It occurs as small enclaves within the khondalite and pelitic granulite. The mineral assemblage includes spinel-sapphirine-garnet-cordierite-orthopyroxene-sillimanite-biotite-k-feldspar-plagioclase-quartz. Development of reaction textures and symplectites are common in the sapphirine-spinel granulites which have been used to describe reaction history. The relative X Mg values among various minerals are as follows: cordierite > biotite > sapphirine > orthopyroxene > garnet > spinel. The P-T evolution of these sapphirine-spinel granulites constrained through the pseudosection modelling in the NCKFMASH model system using PerpleX software indicate conditions of ultra-high temperature (UHT) metamorphism. The P-T estimates computed by isopleths define a retrograde trajectory with decompression of c.2.5 kbar from P-T max of c.10.5 kbar at c.950 oC. The sequence of reactions as deduced from the symplectite assemblages, together with pseudosection modelling, from the Kaithapalli area, offer greater opportunities for providing a better picture of petrological evolution of northern part of the Eastern Ghats Belt (EGB). © 2019, Geological Society of India.

Item Type:	Journal Article
Publication:	Journal of the Geological Society of India
Publisher:	Geological Society of India
Additional Information:	Copyright for this article belongs to Geological Society of India
Department/Centre:	Division of Mechanical Sciences > Centre for Earth Sciences
Date Deposited:	08 Apr 2019 11:31
Last Modified:	08 Apr 2019 11:31
URI:	http://eprints.iisc.ac.in/id/eprint/62014

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