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

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P-T Conditions of Metamorphism and Fluid Inclusion Characteristics of the Coorg Granulites, Karnataka


Affiliations
1 Department of Geology, Manasagangotri, University of Mysore, Mysore 570006, India
     

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Charnockites and basic granulites occur extensively around Coorg in Western Ghats. Minor metasedimentary rocks like kyanite/sillimanite bearing gneisses and ironstone also occur. A set of late dolerite dykes cross cut all the lithologies.

The Coorg granulites record a near-peak metamorphic conditions of 720 to 760° C at pressures of 7 lo 8.6 kb. Charnockites and basic granulites contain high-density ( 1.07 to 1.09 g/cc) carbonic inclusions. Micro-textures, mineral P-T and fluid inclusion data indicate "clockwise" P-T trajectory, pointing to a relatively rapid uplift/erosion of the Coorg granulites.


Keywords

Granulites, Thermobarometry, Fluid Inclusions, Igneous Petrology, Coorg District, Karnataka.
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  • P-T Conditions of Metamorphism and Fluid Inclusion Characteristics of the Coorg Granulites, Karnataka

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Authors

C. Srikantappa
Department of Geology, Manasagangotri, University of Mysore, Mysore 570006, India
L. Venugopal
Department of Geology, Manasagangotri, University of Mysore, Mysore 570006, India
J. Devaraju
Department of Geology, Manasagangotri, University of Mysore, Mysore 570006, India
B. Basavalingu
Department of Geology, Manasagangotri, University of Mysore, Mysore 570006, India

Abstract


Charnockites and basic granulites occur extensively around Coorg in Western Ghats. Minor metasedimentary rocks like kyanite/sillimanite bearing gneisses and ironstone also occur. A set of late dolerite dykes cross cut all the lithologies.

The Coorg granulites record a near-peak metamorphic conditions of 720 to 760° C at pressures of 7 lo 8.6 kb. Charnockites and basic granulites contain high-density ( 1.07 to 1.09 g/cc) carbonic inclusions. Micro-textures, mineral P-T and fluid inclusion data indicate "clockwise" P-T trajectory, pointing to a relatively rapid uplift/erosion of the Coorg granulites.


Keywords


Granulites, Thermobarometry, Fluid Inclusions, Igneous Petrology, Coorg District, Karnataka.