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A Numerical-Simulation Of The Gneiss-Charnockite Transformations In Southern India

Swamy, V and Iyer, GVA and Menon, AG (1992) A Numerical-Simulation Of The Gneiss-Charnockite Transformations In Southern India. In: Journal of the Geological Society of India, 40 (1). pp. 13-28.

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This paper presents a numerical simulation of the well-documented, fluid-controlled Kabbal and Ponmudi type gneiss-chamockite transformations in southern India using a free energy minimization method. The computations have considered all the major solid phases and important fluid species in the rock - C-O-H and rock - C-O-H-N systems. Appropriate activity-composition relations for the solid solutions and equations of state for the fluids have been included in order to evaluate the mineral-fluid equilibria attending the incipient chamockite development in the gneisses. The C-O-H fluid speciation pattern in both the Kabbal and Ponmudi type systems indicates that CO2 and H2O make up the bulk of the fluid phase with CO, CH4, H-2 and O2 as minor constituents. In the graphite-buffered Ponmudi-system, the abundance of CO, CH4 and H-2 is orders of magnitude higher than that in the graphite-free Kabbal system. Simulation with C-O-H-N fluids of varying composition demonstrates the complementary role of CO2 and N2 as rather inert dilutants of H2O in the fluid phase. The simulation, carried out on available whole-rock data, has demonstrated the dependence of the transformation X(H2O) on P,T, and phase and chemical composition of the precursor gneiss.

Item Type: Journal Article
Publication: Journal of the Geological Society of India
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Keywords: Charnockitization;Thermodynamic Modeling;High-Grade Metamorphism;Mineral-Fluid Equilibria;Granulites.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 28 Jan 2011 05:08
Last Modified: 28 Jan 2011 05:08
URI: http://eprints.iisc.ac.in/id/eprint/35081

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