Vesuvianite-wollastonite-grossular-bearing calc-silicate rock near Tatapani,Surguja district,Chhattisgarh |
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| Authors: | S C Patel |
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| Institution: | (1) Department of Earth Sciences, Indian Institute of Technology, Bombay, Mumbai, 400 076, India |
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| Abstract: | This paper reports the occurrence of vesvianite + wollastonite + grossular + diopside + microcline + quartz assemblage in
an enclave of calc-silicate rocks occurring within quartzofeldspathic gneiss near Tatapani in the western part of Chhotanagpur
Gneissic Complex. The enclave contains phlogopite-absent and phlogopite-bearing calc-silicate rocks, the latter being much
more abundant than the former. The above assemblage occurs in the phlogopite-absent rock. Phlogopite-bearing rock contains
the assemblage phlogopite + salite + microcline + plagioclase + quartz. A strong schistosity is developed in both the calc-silicate
rocks and the minerals are syntectonic with the major foliation-forming event in the area. The vesuvianite-bearing assemblage
is formed by amphibolite facies regional metamorphism of a calcareous protolith at pressure < 4 kbar and XCO
2 (fluid) < 0.15. |
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| Keywords: | Vesuvianite wollastonite grossular diopside calc-silicate rock |
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