New Occurrence of Sapphirine-spinel-bearing Granulite from NW of Chilka Lake, Eastern Ghats Belt, Odisha
Authors
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
D. Prakash -
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
B. Vishal
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
A. S. Naik
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
R. Yadav
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
S. K. Rai
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Centre for Earth Sciences, Indian Institute of Science, Bangalore - 560 012
S. Tewaric
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Centre of Advanced Study in Geology, University of Lucknow, Lucknow - 226 007
M. K. Yadav
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
S. Tiwari
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
S. Dash
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Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005
C. Pattnaik
DOI:
https://doi.org/10.1007/s12594-019-1143-7Keywords:
No KeywordsAbstract
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-sapphirinegarnet- cordierite-orthopyroxene-sillimanite-biotite-k-feldsparplagioclase- quartz. Development of reaction textures and symplectites are common in the sapphirine-spinel granulites which have been used to describe reaction history. The relative XMg 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 Perple_X 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-Tmax 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).
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