Rock-water interaction and evolution of sulphide ores in the late Archaean Chitradurga greenstone belt of southern India |
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| Authors: | H N Bhattacharyay A D Mukherjee P K Bhattacharyay |
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| Institution: | (1) Department of Geology, Durgapur Government College, Durgapur, West Bengal, India;(2) Center for Advance Study in Economic Geology, Jadavpur University, 700 032 Calcutta, India |
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| Abstract: | Sulphide ore mineralization developed in proximity to iron formations in a cyclic volcano-sedimentary sequence that forms
the offshore part of the late Archaean intracratonic basin of the Chitradurga greenstone belt, south India. The chemistry
of volcanic suite attests to an extensive rock-water interaction resulting in exchange of Si and Na for divalent cations,
including Cu, Pb and Zn. The exchange took place during hydrothermal alteration of basalt prior to its involvement in regional
deformation and metamorphism. A hydrothermal convection system extracted Cu, Zn and Pb from sea-floor basalts during a static
phase of evolution of the Chitradurga basin and developed the stratabound ore deposit within the pyroclastics and the stringer
ores below. |
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