Tectono-magmatic evolution of the west coast of india |
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Authors: | K.R. Subrahmanya |
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Affiliation: | aDepartment of Marine Geology, Mangalore University, Mangalagangotri-574 199, India |
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Abstract: | The west and east coasts of India (WCI & ECI) have distinct histories of their own. The WCI originated subsequent to ECI, which has the imprint of two hotspots - Marion and Reunion, evolved through several stages of rifting, magmatism and isostatic movements. Important among them are: felsic magmatism associated with doming (93 Ma); mafic magmatism related to rifting (88 Ma); origin of the Western Ghats of India and the east facing scarp of Madagascar (all the three related to separation of Madagascar from India); mafic (Deccan) volcanism in the north-western parts of India (67 Ma); rifting of Seychelles micro-continent and lava cover from the north-western parts of India along the Carlsberg ridge (62 Ma/A 27); isostatic subsidence relating to loading of Deccan basalts; subsidence of Bombay offshore region due to reactivation of SONATA rift; separation of Laccadive-Chagos ridge from the southern part of Mascarene plateau because of shifting of the Central Indian Ridge (40 Ma); buckling of South India and tilting of the Peninsula northward due to collision and subduction. These events make the WCI unique and endowed with a great deal of dynamism. |
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Keywords: | Tectonics India-Madagascar separation Continental margin Western Ghat West coast |
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