Seaward dipping reflectors along the SW continental margin of India: Evidence for volcanic passive margin

Show simple item record Ajay, K.K. Chaubey, A.K. Krishna, K.S. Rao, D.G. Sar, D. 2010-12-20T11:29:35Z 2010-12-20T11:29:35Z 2010
dc.identifier.citation Journal of Earth System Science, vol.119(6); 2010; 803-813
dc.description.abstract Multi-channel seismic reflection profiles across the southwest continental margin of India (SWCMI) show presence of westerly dipping seismic reflectors beneath sedimentary strata along the western flank of the Laccadive Ridge-northernmost part of the Chagos-Laccadive Ridge system. Velocity structure, seismic character, 2D gravity model and geographic locations of the dipping reflectors suggest that these reflectors are volcanic in origin, which are interpreted as Seaward Dipping Reflectors (SDRs). The SDRs; 15 to 27 km wide overlain by approx. 1 km thick sediment; are observed at three locations and characterized by stack of laterally continuous, divergent and off-lapping reflectors. Occurrence of SDRs along western flank of the Laccadive Ridge adjacent to oceanic crust of the Arabian Basin and 2D crustal model deduced from free-air gravity anomaly suggest that they are genetically related to incipient volcanism during separation of Madagascar from India. It is suggested that (i) SWCMI is a volcanic passive margin developed during India-Madagascar breakup in the Late Cretaceous, and (ii) continent-ocean transition lies at western margin of the Laccadive Ridge, west of feather edge of the SDRs. Occurrence of SDRs on western flank of the Laccadive Ridge and inferred zone of transition from continent to ocean further suggest continental nature of crust of the Laccadive Ridge.
dc.language.iso en
dc.publisher Indian Academy of Sciences
dc.rights Copyright [2010]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subject continental margins
dc.subject seismic reflection
dc.subject gravity model
dc.subject Laccadive Ridge
dc.title Seaward dipping reflectors along the SW continental margin of India: Evidence for volcanic passive margin
dc.type Journal Article

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