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Gravity Field and Subsurface Geometry of the Kalpatta Granite, South India and the Tectonic Significance
Authors:P John Kurian  M Radha Krishna  CG Nambiar  BVS Murthy
Institution:1. Geological Studies Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata 700108, India;2. Department of Geosciences, Shimane University, Matsue 690-8504, Japan;3. Department of Biostatistics and Statistical programming, Global data operations, Novartis Healthcare private limited, Bandra Kurla Complex, Mumbai 400051, India;4. Department of Applied Geosciences, German University of Technology in Oman, P.B. 1816, Athaiba, PC 130, Muscat, Oman;5. Graduate school of Science and Technology, Division of Earth Sciences, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8512, Japan
Abstract:The Kalpatta granite, of Pan-African age occurs in the southern granulite terrain of Peninsular India. Bouguer anomaly map of the Kalpatta and adjoining areas reveals a gravity low of 8–10 mGal centered over the Kalpatta granite and a minor low of 4–6 mGal over the adjacent Ambalavayal granite pluton. The residual anomaly map prepared for the Kalpatta granite has been utilized to obtain depth extent and 3-D geometry of the pluton. The analysis suggests that the Kalpatta granite is an elliptical and somewhat pear shaped body with horizontal dimensions of 6–11 km and extending to a depth of 6.5km, has steeply inward dipping contacts and the shape seen on the surface continues throughout its depth. The smooth oval shape could indicate low ductility contrast, deeper level of emplacement and permissive nature of the pluton. The 3-D depth model indicates an oblique section with much deeper levels exposed in the south, in other words, the crustal block encompassing the pluton has suffered a NNW tilt during uplift after the emplacement. It is further inferred that there was no post intrusive shape modification, the NW tilting of the region and denudation gave rise to the present outcrop pattern of the body.
Keywords:Gravity  Kalpatta granite  crustal model  South India  tectonics
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