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Magnetic anomalies of offshore Krishna–Godavari basin, eastern continental margin of India

DRS at CSIR-National Institute of Oceanography

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Title Magnetic anomalies of offshore Krishna–Godavari basin, eastern continental margin of India
 
Creator Swamy, K.V.
Murthy, I.V.R.
Krishna, K.S.
Murthy, K.S.R.
Subrahmanyam, A.S.
Rao, M.M.M.
 
Subject Magnetic anomalies
Krishna–Godavari basin
continental margin
 
Description The marine magnetic data acquired from offshore Krishna-Godavari (K-G) basin, eastern continental margin of India (ECMI), brought out a prominent NE-SW trending feature, which could be explained by a buried structural high formed by volcanic activity. The magnetic anomaly feature is also associated with a distinct negative gravity anomaly similar to the one associated with 85 degrees E Ridge. The gravity low could be attributed to a flexure at the Moho boundary, which could in turn be filled with the volcanic material. Inversion of the magnetic and gravity anomalies was also carried out to establish the similarity of anomalies of the two geological features (structural high on the margin and the 85 degrees E Ridge) and their interpretations. In both cases, the magnetic anomalies were caused dominantly by the magnetization contrast between the volcanic material and the surrounding oceanic crust, whereas the low gravity anomalies are by the flexures of the order of 3-4 km at Moho boundary beneath them. The analysis suggests that both structural high present in offshore Krishna-Godavari basin and the 85 degrees E Ridge have been emplaced on relatively older oceanic crust by a common volcanic process, but at discrete times, and that several of the gravity lows in the Bay of Bengal can be attributed to flexures on the Moho, each created due to the load of volcanic material
 
Date 2009-08-20T07:46:07Z
2009-08-20T07:46:07Z
2009
 
Type Journal Article
 
Identifier Journal of Earth System Science, vol.118(4); 405-412
http://drs.nio.org/drs/handle/2264/3380
 
Language en
 
Publisher Indian Academy of Sciences