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

H. N. Bhattacharya ¹, A. Chatterjee ¹, Somnath Chowdhury ¹

Affiliations
1 Department of Geology, Durgapur Govt. College, Durgapur - 713 214, IN

Abstract

Tourmalinite occurs as a stratigraphically persistent unit in the Proterozoic Cu-U belt of Singhbhum, Bihar. Internally the tourmalinite is plane laminated with alternations of tourmaline-rich and quartz-rich layers, and is also cross-stratified. Tounnalinite breccia also forms a significant part of the unit. Preserved primary sedimentary features, amidst deformed and metamorphosed rocks, attest to a primary sedimentary origin of the tourmalinite. Close assocication of Cu-Sulphide mineralizations and tourmalinite suggests volcanogenic origin of the Cu-sulphide mineralization and precipitation of the tourmalinite from boron-rich exhalative fluids.

Keywords

Tourmalinite, Proterozoic, Cu-U Belt, Singhbhum, Dhanjori Group, Bihar.

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