Abstract
Abstract The Archaean iron ore basin of Singhbhum-Keonjhar in eastern India evolved between 3.8 and 2.9 Ga. The basin is characterized by approximately 7.5 km of volcanogenic and meta-sedimentary materials, mafic and felsic lavas, tuffs and mafic-ultramafic intrusions. It also shows poly-phase deformation with superposed folding and post depositional granite intrusions. The analysis of a thermal model in basin subsidence which incorporates the effects of increased crustal density by igneous intrusions and emplacements and elastic flexuring during gravitational loading is presented. Punctuated thermal pulses from the mantle or crust-mantle boundary can account for the 5 to 7.8 km subsidence of the Singhbhum Basin crust. An estimation of radial stress at the base of the Singhbhum iron ore basin is presented to show its significance in the development of fractures and fault or lineament openings which can provide passages for the migration of mafic and felsic lavas and tuffs inside the basin. The importance of thermal events in the evolution of Archaean iron ore basins on the eastern Indian shield is documented.
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