Abstract
Abstract The status of the Proterozoic volcano-sedimentary Simlipal complex (covering latitudes 21°14’-22°20’N and longitudes 86°03’-86°35’E) of Singhbhum, eastern India remains unclear till date. The Simlipal complex has classically been designated to represent three layers of alternate spilitic volcanics and quartzite deposited in a geosyncline that unconformably overlies the meta-sedimentary Singhbhum Group of rocks. The study of the authors (entailing digital elevation map) bring out that the concentric ring-like outcrop pattern of Simlipal complex is only topography-controlled and repetitive bands of quartzite and volcanics do not exist. Further, it has been documented that the Simlipal complex comprises basemental weakly metamorphosed quartzite-phyllite (~450m thick) heterolith unit (proposed Lulung Formation), which is followed upward by fresh, sub-horizontal (~250m thick) volcanic unit (proposed Barehipani Formation) with local presence of peridotite-gabbro, and finally to quartz arenite unit (~150m thick) as the topmost layer (proposed Jurunda Formation). The heterolith unit (proposed Lulung Formation) has been envisaged as a part of the older Singhbhum Group. The basaltic rocks (Barehipani Formation) correspond to calc-alkaline tectonic affinity based on geochemistry. We propose an arc-subduction related setting for the Simlipal complex which may be further confirmed through detailed major/trace elements and isotopic studies.
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