Gravity inferred subsurface structure of Gadwal schist belt, Andhra Pradesh |
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Authors: | G Ramadass I B Ramaprasada Rao N Srinivasulu |
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Institution: | (1) Center of Exploration Geophysics, Department of Geophysics, Osmania University, 500 007 Hyderabad, India |
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Abstract: | Detailed gravity data collected across the Gadwal schist belt in the state of Andhra Pradesh show an 8.4 mgal residual gravity
anomaly associated with meta-sediments/volcanics of the linear NNW-SSE trending schist belt that shows metamorphism from green
schist to amphibolite facies. This schist belt is flanked on either side by the peninsular gneissic complex. The elevation
and slab Bouguer corrected residual gravity profile data were interpreted using 2-D prism models. The results indicate a synformal
structure having a width of 1.8 km at the surface, tapering at a depth of about 2.6 km with a positive density contrast of
0.15 gm/cc with respect to the surrounding peninsular gneissic complex. |
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Keywords: | Schist belt subsurface structure gravity-inferred basement |
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