Structure and evolution of the western continental margin of India deduced from gravity, seismic, geomagnetic and geochronological studies

Details Structure and evolution of the western continental margin of India deduced from gravity, seismic, geomagnetic and geochronological studies Structure and evolution of the western continental margin of India deduced from gravity, seismic, geomagnetic and geochronological studies

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41..186c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 41, Issue 2-3, p. 186-198.

Physics

16

Scientific paper

Available geochronological, gravity, seismic and geomagnetic data on the western continental margin of India between 8-20°N are presented. Based on the data three models describing the evolution of the crustal structure are developed. Model 1 describes the evolution of the crustal structure along 19°N. The main basic igneous activity that accompanied the tectonic events since the Late Cretaceous resulted in the formation of rifts along the coast thus giving rise to the present day structure. The acid volcanic event that preceded the above activity at about 93 Ma ago is responsible for the observed crustal structure along 13°30'N shown in model 2. This event resulted in the formation of the St. Mary group of islands along this latitude. Counterclockwise rotation of the Indian plate during the Tertiary period caused rifting of the continental blocks giving rise to the Laccadive-Kerala graben bounded by the Chagos-Laccadive ridge on the west and the west coast fault on the east. Vertical movements of the rifted blocks promoted the deposition of both continental and marine sediments on the coast west of the west coast fault. This tectonic event was accompanied by upwarping of the mantle-crust thus giving rise to the present day structure shown in model 3.

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