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Spreading rate dependent seafloor deformation in response to India-Eurasia collision: results of a hydrosweep survey in the Central Indian Ocean basin

DRS at CSIR-National Institute of Oceanography

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Title Spreading rate dependent seafloor deformation in response to India-Eurasia collision: results of a hydrosweep survey in the Central Indian Ocean basin
 
Creator Mukhopadhyay, R.
George, P.
Ranade, G.
 
Subject seafloor spreading
seafloor mapping
deformation
plate convergence
bathymetry
faults
crustal acretion
palaeo studies
 
Description The nature of magnetic anomalies and associated ridge-parallel structural lineaments and topographic complexities from an area bounded by latitudes 9 degrees 45'S and 14 degrees 45'S in the Central Indian Ocean Basin (CIOB) suggest that the underlying crust was generated from the South East Indian Ridge (SEIR) between 60 and 50 Ma. The multibeam bathymetry reveals intense ridge-parallel flexuring and faulting of the seafloor. The nature and intensity of flexures (amplitude and wavelength), and fault scarps (their ridge-parallel orientation, variable length, and non-uniform spacing) implies a pronounced effect of regional tectonic disturbance. We attribute these variations to variation in the rates of spreading at th eridge crest. In particular, a decrease in the rate of plate accretion around magnetic anomalies 26 and 23 about the SEIR, are reflected in the morphology, distribution, and nature of fault scarps and flexures. These deformations seem to have been by two episodes of collision between India and Eurasia: an initial phase at A26 (approx 58.2 Ma) and a final phase at A23 (approx 51.6 Ma)
 
Date 2009-01-12T09:18:24Z
2009-01-12T09:18:24Z
1997
 
Type Journal Article
 
Identifier Marine Geology, Vol.140; 219-229p.
http://drs.nio.org/drs/handle/2264/2053
 
Language en
 
Rights Copyright [1997]. 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.
 
Publisher Elsevier