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Calderite-rich garnets from metamorphosed manganese silicate rocks of the Sausar Group, India, and their derivation

Published online by Cambridge University Press:  05 July 2018

Somnath Dasgupta ,
P. K. Bhattacharya ,
H. Banerjee ,
M. Fukuoka ,
N. Majumdar  and
Supriya Roy
Somnath Dasgupta
Affiliation:
Centre of Advanced Study in Economic Geology, Department of Geological Sciences, Jadavpur University. Calcutta-700032, India
P. K. Bhattacharya
Affiliation:
Centre of Advanced Study in Economic Geology, Department of Geological Sciences, Jadavpur University. Calcutta-700032, India
H. Banerjee
Affiliation:
Centre of Advanced Study in Economic Geology, Department of Geological Sciences, Jadavpur University. Calcutta-700032, India
M. Fukuoka
Affiliation:
Centre of Advanced Study in Economic Geology, Department of Geological Sciences, Jadavpur University. Calcutta-700032, India
N. Majumdar
Affiliation:
Centre of Advanced Study in Economic Geology, Department of Geological Sciences, Jadavpur University. Calcutta-700032, India
Supriya Roy
Affiliation:
Centre of Advanced Study in Economic Geology, Department of Geological Sciences, Jadavpur University. Calcutta-700032, India
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Abstract

Manganiferous garnets occur in metamorphosed Mn silicate-oxide and silicate-carbonate-oxide rocks of the Sausar Group, India. The garnets of the carbonatic rock show maximum calderite content (∼50 mole%). Increased Ca content in the bulk has been observed to be sympathetically related to the concentration of calderite, rather than the expected andradite component of the garnets. This is the consequence of the preferential partitioning of Ca in coexisting pyroxmangite and/or carbonate. Petrochemical characteristics of the diverse assemblages in response to the physical conditions of metamorphism show that the calderite solubility in manganiferous garnet is not only a function of pressure. Such characteristics only indicate that the mobile components in the bulk influenced the mineralogy of the assemblages at the ambient physical conditions of metamorphism, and this in turn controlled the calderite solubility in garnet.

Keywords

calderitegarnetmanganeseSausar GroupIndia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 362 , October 1987 , pp. 577 - 583
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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Footnotes

1

Department of Geology, Kyushu University, Fukuoka, Japan

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