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

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Anorthositic Enclaves in the Gneisses Around Holenarasipur Schist Belt, Hassan District, Karnataka


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1 National Geophysical Research Institute, Hyderabad 500 007, India
     

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Two occurrences of anorthosite enclaves in the 3.4 b.y. old gneisses surrounding the Holenarasipur schist belt are reported. The Mandagere enclave has An92 whereas, Arkalgud enclave has An83. Both the bodies are metamorphosed to higher amphibolite facies and exhibit granoblastic texture. They are associated with ultramafic enclaves. These occurrences along with the lunar type anorthosites of Holenarasipur Group greenstone belts are significant in early crustal evolution models.
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  • Anorthositic Enclaves in the Gneisses Around Holenarasipur Schist Belt, Hassan District, Karnataka

Abstract Views: 190  |  PDF Views: 2

Authors

S. M. Hussain
National Geophysical Research Institute, Hyderabad 500 007, India
S. M. Ahmad
National Geophysical Research Institute, Hyderabad 500 007, India

Abstract


Two occurrences of anorthosite enclaves in the 3.4 b.y. old gneisses surrounding the Holenarasipur schist belt are reported. The Mandagere enclave has An92 whereas, Arkalgud enclave has An83. Both the bodies are metamorphosed to higher amphibolite facies and exhibit granoblastic texture. They are associated with ultramafic enclaves. These occurrences along with the lunar type anorthosites of Holenarasipur Group greenstone belts are significant in early crustal evolution models.