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Three-phase tectonic evolution of the Andaman backarc basin

DRS at CSIR-National Institute of Oceanography

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Title Three-phase tectonic evolution of the Andaman backarc basin
 
Creator KameshRaju, K.A.
 
Subject bathymetry data
ridge propagation
 
Description A 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.
 
Date 2006-09-01T11:41:48Z
2006-09-01T11:41:48Z
2005
 
Type Journal Article
 
Identifier Current Science, vol.89(11), 1932-1937p.
http://drs.nio.org/drs/handle/2264/339
 
Language en
 
Format 249856 bytes
application/pdf
 
Publisher Indian Academy of Sciences