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Western Continental Margin and Adjacent Oceanic Regions

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Geodynamic Evolution of the Indian Shield: Geophysical Aspects

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Abstract

The passive continental margin of Western India and adjoining oceanic regions, are associated with a transitional-type thin crust, having semi-continental character. This margin extends for over 1000 km in length and assumes special significance in the realm of geodynamic evolution of the Indian subcontinent. The period after India’s breakup from Antarctica, was an extremely dynamic phase with extensive plate reorganisations, increase in spreading rates and formation of the Indian Ocean. Indian subcontinent traversed over four mantle hotspots in quick succession during this period. Several major geodynamic events also took place close to this margin around the same time, like Madagascar and Seychelles breakup, K-T impact, Deccan volcanism and formation of Carlsberg and Laxmi ridges to name a few. This region is dotted by thin underplated magmatic crust, high temperature gradients and heat flow and number of hot springs, besides high level of intraplate seismicity, including Reservoir Triggerd Seismicity (RTS) as well. Crust-mantle structure below this region is severely affected by Deccan volcanism and associated geodynamic phenomena.

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Pandey, O.P. (2020). Western Continental Margin and Adjacent Oceanic Regions. In: Geodynamic Evolution of the Indian Shield: Geophysical Aspects. Society of Earth Scientists Series. Springer, Cham. https://doi.org/10.1007/978-3-030-40597-7_6

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