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dc.contributor.authorDesa, M.
dc.contributor.authorRamana, M.V.
dc.contributor.authorRamprasad, T.
dc.date.accessioned2009-06-02T11:35:59Z
dc.date.available2009-06-02T11:35:59Z
dc.date.issued2009
dc.identifier.citationGeophysical Journal International, vol.177(3); 1265-1278
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3352
dc.description.abstractAnalysis of 3100 km of newly acquired marine magnetic data, constrained by satellite and shipborne free air gravity anomalies, in the corridor between the 86°E fracture zone (FZ) and Ninetyeast Ridge, north of the equator reveals the evolutionary history of the Late Cretaceous crust characterized by anomaly 34 through 31 (83.5-68.7Ma) under complex tectonic settings. Seafloor spreading model studies suggest that the crust, particularly between the chrons 33R and 33 (79.0-73.6 Ma), was formed with variable and slightly higher half-spreading rates (4.8-7.1 cm yr sup(-1)) than the crust of similar age either in the regions west of 86 degrees E FZ or east of the Ninetyeast Ridge or the Southern Crozet Basin. Further, the interpretation of magnetic anomalies suggests the presence of fossil spreading ridge segments and extra oceanic crust on the Indian plate that has been transferred from the Antarctica plate by discrete southward ridge jumps. These ridge jumps are caused by thermal instability of the spreading centre as the Indian plate moved northward over the Kerguelen mantle plume. The present study indicates that the spreading ridge-plume interaction is the prime mechanism for these ridge jumps, which have occurred since 75.8 Ma. The newly identified magnetic anomalies 34 through 31 and the inferred approx. N3 degrees E trending FZs refined the plate reconstruction models for that period
dc.language.isoen
dc.publisherThe Royal Astronomical Society
dc.rightsCopyright [2009]. 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.subjectgravity anomalies
dc.subjectmagnetic anomalies
dc.subjectfracture zones
dc.subjectcrustal structure
dc.titleEvolution of the Late Cretaceous crust in the equatorial region of the Northern Indian Ocean and its implication in understanding the plate kinematics
dc.typeJournal Article


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