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Geophysical studies over a segment of the Carlsberg Ridge, Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Geophysical studies over a segment of the Carlsberg Ridge, Indian Ocean
 
Creator Ramana, M.V.
Ramprasad, T.
KameshRaju, K.A.
Desa, M.
 
Subject geophysics
magnetic data
gravity data
bathymetric data
transform faults
 
Description The study of magnetic, gravity and bathymetric data over a segment of Carlsberg Ridge between 3 degrees and 4 degrees N lat., and 63 degrees 30' and 64 degrees 30'E long. revealed the presence of a prominent 57 degrees W trending rift valley. The depth of the valley varies from 3250 to 4400 m and its width varies from 15 to 19 km. Analysis of the magnetic data leads to the identification of the Brunhes/Matuyama boundary (0.73 Ma) across the ridge axis. The Jaramillo event commonly associated with the fast spreding centres is not reflected in the present study. The late Pliocene-Recent oceanic crust across part of the Carlsberg Ridge evolved with an average spreading rate of 1.25 cm yr sup(-1). The rift valley shallows in the southeast, narrows in the middle and is deeper and wider toward the northwest. The occurrence of large amplitude magnetic and gravity anomalies in association with the bathymetric deep in the northwest within the rift valley is suggested to be a zone of future segmentation of the ridge axis. A new transform fault appears to offset the trend of bathymetric and gravity contours in the northwestern part of the study area
 
Date 2009-05-06T10:40:27Z
2009-05-06T10:40:27Z
1993
 
Type Journal Article
 
Identifier Marine Geology, Vol.115; 21-28p.
http://drs.nio.org/drs/handle/2264/2823
 
Language en
 
Rights Copyright [1993]. 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