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

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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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