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Gravity anomalies and crustal structure of the Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Gravity anomalies and crustal structure of the Bay of Bengal
 
Creator Subrahmanyam, V.
Krishna, K.S.
Murthy, I.V.R.
Sarma, K.V.L.N.S.
Desa, M.
Ramana, M.V.
KameshRaju, K.A.
 
Subject gravity anomalies
crustal structure
lithosphere
freeair anomalies
freeair gravity charts
 
Description The Bengal Fan is covered afresh by systematic geological and geophysical investigations by National Institute of Oceanography (NIO), India and a detailed free-air gravity map of the fan is prepared. The map shows two strong gravity lows - one corresponding to the continental shelf and the other to the 85 degrees E Ridge. The Ninetyeast Ridge is brought out as a gravity high. The anomalies are inverted to determine the anomaly-producing interfaces, which suggest that the 85 degrees E Ridge anomaly could not be explained by an isolated geophysical model invoking a negative density contrast for the ridge material. The 85 degrees E Ridge anomaly and several other isolated gravity lows are attributed mostly to the depression-like structures in the Moho. Each depression of the Moho is associated with a basement high. The depression beneath the 85 degrees E Ridge is about 6 km deep from the regional Moho boundary, which is at variance to the earlier results. It is suggested that the depressions may possibly have developed due to the surface volcanic loads emplaced on already evolved oceanic crust of the Bay of Bengal
 
Date 2009-01-07T10:28:50Z
2009-01-07T10:28:50Z
2001
 
Type Journal Article
 
Identifier Earth Planetary Science Letters, Vol.192; 447-456p.
http://drs.nio.org/drs/handle/2264/1549
 
Language en
 
Rights Copyright [2001]. 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