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dc.contributor.authorKameshRaju, K.A.
dc.date.accessioned2006-09-01T11:41:48Z
dc.date.available2006-09-01T11:41:48Z
dc.date.issued2005
dc.identifier.citationCurrent Science, vol.89(11), 1932-1937p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/339
dc.description.abstractA three-phase evolutionary scheme since Late Oligocene for the Andaman backarc basin is proposed based on the multibeam swath bathymetry, magnetic and seismological data. A SW–NE trending spreading ridge bisects the basin. The tectonic evolution of the Andaman basin with special reference to the formation of oceanic crust within the backarc basin encompassing the backarc spreading, suggests a phase of ridge propagation. Swath bathymetry data documented topographic fabric of the ridge propagation and reveal several morphotectonic features that divide the basin into a complex western part comprising arc-parallel seamount chains, N–S trending fault systems and a relatively smooth eastern part. Spreading centre jump during Late Oligocene, rifting and extension during Middle Miocene to Early Pliocene followed by the recent true seafloor spreading since last 4 Ma define the three-phase tectonic evolution of the Andaman backarc basin. The recent phase has experienced westward propagation of the spreading centre. It is suggested that ridge propagation modulated the crust. A schematic evolutionary sequence of the Andaman backarc basin is presented.
dc.format.extent249856 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherIndian Academy of Sciences
dc.subjectbathymetry data
dc.subjectridge propagation
dc.titleThree-phase tectonic evolution of the Andaman backarc basin
dc.typeJournal Article


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