Satellite gravity anomalies and crustal features of the Central Indian Ocean Basin
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Satellite free-air gravity anomaly contour map at 5 mGal interval, seismic reflection and bathymetric data lead to the identification of deformed crustal structure of the Central Indian Ocean Basin. Twenty-three NE-SW trending deformed crustal features have been identified between 5 degrees S to 4 degrees N and 77 degrees to 89 degrees E. Pattern of deformation varies with large relief anticlines in the west, numerous long wavelength anticlinal basement rises in the middle of the basin, and zones of high-angle reverse faults and low-amplitude broad basement rises dominated with reverse faults in the east. Their disposition and deformation pattern record excess folding and shortening in the east of the basin. A chain of near circular free-air anomalies due to volcanic constructs that trend in arcuate shape from north to south parallel to 82.5 degrees E are noted as southern continuity of the 85 degrees E Ridge, which terminates at the Afanasy Nikitin seamount. Change in rheology of the crustal rocks and deformation in the east appears to result due to high heat-flow in the middle of the basin and intense seismicity of the eastern part of the basin. The present plate boundary forces contribute to the change in physical state and architecture of deformation of crust and result in vast area undergoing NNW-SSE to NW-SE compression.
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