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

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Rock Melt Extrusion at Puruliya, West Bengal


Affiliations
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, India
 

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A detailed investigation of the 'rock melt extrusion', reported about three years back in this journal from Puruliya district, suggests it to be a surface phenomenon. The heat generated by burning of the torn out overhead 11 KV electric lines melted locally the fragmentary amphibolite pieces as well as the enclosing deep brown soil to the south of Jabjabigora. Petrographic, physical and geochemicaI data suggest that both the deep brown soil and amphibolite fragments underwent possibly complete melting on the surface, the former at a temperature a little above 1100°C and the latter at above 1350° to 1360°C.
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  • Rock Melt Extrusion at Puruliya, West Bengal

Abstract Views: 210  |  PDF Views: 141

Authors

C. Bhattacharyya
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, India
S. Das
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, India
J. Banerjee
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, India
S. P. Pal
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, India

Abstract


A detailed investigation of the 'rock melt extrusion', reported about three years back in this journal from Puruliya district, suggests it to be a surface phenomenon. The heat generated by burning of the torn out overhead 11 KV electric lines melted locally the fragmentary amphibolite pieces as well as the enclosing deep brown soil to the south of Jabjabigora. Petrographic, physical and geochemicaI data suggest that both the deep brown soil and amphibolite fragments underwent possibly complete melting on the surface, the former at a temperature a little above 1100°C and the latter at above 1350° to 1360°C.