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Swamy, V.
- A Numerical Simulation of the Gneiss-Charnockite Transformations in Southern India
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Authors
Affiliations
1 Department of Inorganic and Physical Chemistry, I. I. Sc., Bangalore - 560 012, IN
2 J. N. Centre for Advanced Scientific Research, I. I. Sc., Campus, Bangalore - 560 012, IN
3 Mass Spectrometry Laboratory, I. I. Sc., Bangalore - 560 012, IN
1 Department of Inorganic and Physical Chemistry, I. I. Sc., Bangalore - 560 012, IN
2 J. N. Centre for Advanced Scientific Research, I. I. Sc., Campus, Bangalore - 560 012, IN
3 Mass Spectrometry Laboratory, I. I. Sc., Bangalore - 560 012, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 1 (1992), Pagination: 13-28Abstract
This paper presents a numerical simulation of the well-documented, fluid-controlled Kabbal and Ponmudi type gneiss-charnockite 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 charnockite 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 H2 and O2 as minor constituents. In the graphite-buffered Ponmudi-system, the abundance of CO, CH4 and H2 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 transfonnation X(H2O) on P, T, and phase and chemical composition of the precursor gneiss.Keywords
Charnockitization, Thermodynamic Modelling, High-Grade Metamorphism, Mineral-Fluid Equilibria, Granulites.- High-Temperature Reactions of Alkali and Plagioclase Feldspars With Alkali and Alkaline Earth Chlorides: Formation of Celsian
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Authors
Affiliations
1 Department of Inorganic and Physical Chemisty, Indian Institute of Science, Bangalore-560 012, IN
2 Instrumentation and Services Unit, Indian Institute of Science, Bangalore-560 012, IN
1 Department of Inorganic and Physical Chemisty, Indian Institute of Science, Bangalore-560 012, IN
2 Instrumentation and Services Unit, Indian Institute of Science, Bangalore-560 012, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 43, No 3 (1994), Pagination: 305-310Abstract
High-temperature reactions (Ca 900°C) involving albite, K-feldspar or plagioclase and K, Ba-or K, Sr chlorides were experimentally studied. These experiments reveal that the reaction between K-exchanged albite, potash feldspar, or plagioclase and Ba-chloride/Ba-K chloride results in the formation of celsian by the breakdown of the starting feldspar structure above 800°C. Sr-feldspar does not form under similar conditions. A size-effect of the large M-site cation appears to be responsible for the formation of celsian. The reaction between K-feldspar and barium chloride may be used as a method for synthesizing celsian.Keywords
Albite, K-Feldspar, Plagioclase, Celsian, Igneous Petrology.- Metamorphic-Metasomatic Fluids and Al, Si Order/Disorder of K-Rich Alkali Feldspars from Southern Indian High Grade Terrain
Abstract Views :182 |
PDF Views:2
Authors
Affiliations
1 Division of Minerals, CSIRO, Clayton South,. Victoria 3169, AU
2 Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore - 560 012, IN
3 Department of Instrumentation, Indian Institute of Science, Bangalore - 560 012, IN
1 Division of Minerals, CSIRO, Clayton South,. Victoria 3169, AU
2 Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore - 560 012, IN
3 Department of Instrumentation, Indian Institute of Science, Bangalore - 560 012, IN