Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Garnet + 2 Sillimanite = 3 mg-Spinel + 5 Quartz Equilibrium-A Potential Geobarometer


Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, India
     

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A geobarometer based on the equilibrium Mg3Al2Si3O12 + 2Al2SiO5 (sillimanite) = 3MgAl2O4+5SiO2 has been proposed. The geobarometric expression can be stated as P(bar)=9.68 T - 7106 + 10.307 T In (agarnetMg3Al2Si3O12)1/3/(aspinelMgAl2O4). Application of the proposed geobarometric formulation to some metapelites indicates that it registers reasonable pressure values which are in good agreement with the recommended pressure values for different terranes.
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  • Garnet + 2 Sillimanite = 3 mg-Spinel + 5 Quartz Equilibrium-A Potential Geobarometer

Abstract Views: 177  |  PDF Views: 2

Authors

A. Bhattacharya
Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, India
A. C. Mazumdar
Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, India

Abstract


A geobarometer based on the equilibrium Mg3Al2Si3O12 + 2Al2SiO5 (sillimanite) = 3MgAl2O4+5SiO2 has been proposed. The geobarometric expression can be stated as P(bar)=9.68 T - 7106 + 10.307 T In (agarnetMg3Al2Si3O12)1/3/(aspinelMgAl2O4). Application of the proposed geobarometric formulation to some metapelites indicates that it registers reasonable pressure values which are in good agreement with the recommended pressure values for different terranes.