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Channel Volatiles Of South Indian Cordierites As Indicators Of Metamorphic Fluid Composition

Swamy, V and Godhavari, KS and Menon, AG and Iyer, GVA (1992) Channel Volatiles Of South Indian Cordierites As Indicators Of Metamorphic Fluid Composition. In: Neues Jahrbuch für Mineralogie - Monatshefte (8). pp. 359-375.

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Official URL: http://www.schweizerbart.de/journals/njma

Abstract

The channel volatiles in cordierites of the Precambrian high-grade metapelites from southern and eastern Karnataka northern Tamil Nadu and southern Kerala were analyzed in an attempt to use them as metamorphic fluid fugacity indicators. Infrared powder absorption spectra, used to characterize the channel volatiles, showed that all the 21 analyzed cordierites have H2O and CO2 as the channel volatiles, indicating the predominantly H2O-CO2 composition of the metamorphic fluids. The H2O fraction in the metamorphic fluid was computed using a published thermodynamic method in conjunction with gravimetrically determined cordierite channel H2O content, available P - T estimates and an appropriate equation of state for the H2O - CO2 fluids. The IR data and these calculated X(H2O) values indicate an overall correlation between the variation in the relative proportion of H2O and CO2 in the fluids and the metamorphic grade. The average computed X(H2O) values are: 0.78 for the amphibolite facies eastern Karnataka pelites, 0.36 for the amphibolite facies southern Karnataka pelites, 0.19 for the southern Karnataka transitional zone rocks and 0.13 for the northern Tamil Nadu granulites. Consistently low X(H2O) values, at about 0.2, were obtained for the orthopyroxene-bearing assemblages.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to E. Schweizerbart Science Publishers.
Keywords: Cordierite;Channel Volatiles;Amphibolite Facies;Granulite Facies;Metamorphic Fluid Fugacity;H2o-Co2 Fluids; Metapelites;Water Barometry;Khondalite;Charnockite.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 25 Jan 2011 10:00
Last Modified: 25 Jan 2011 10:00
URI: http://eprints.iisc.ernet.in/id/eprint/35109

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