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Marine magnetic anomalies off the southwest coast of India and their analysis

DRS at CSIR-National Institute of Oceanography

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Title Marine magnetic anomalies off the southwest coast of India and their analysis
 
Creator Rao, D.G.
Bhattacharya, G.C.
 
Subject Geology and Geophysics
palaeo studies
basalts
deep-sea drilling
bathymetry
continental shelves
magnetic anomalies
ISW, India, West Coast
 
Description Total magnetic intensity and bathymetric surveys were carried out in the offshore area of Ratnagiri on the western continental shelf of India and an isomagnetic anomalies map at a contour interval of 50 nT was prepared which reveals N-S trends of magnetic anomalies. Two-dimensional model and spectral studies of these anomalies were carried out, and subsurface models of the geology in the area have been derived from anomalies at a number of places. The results suggest that the anomalies occur over a magnetic crystalline basement at a depth of 1-1.2 km which is similar (in magnetization) to onshore basalts of northwest India. These anomalies are believed to be an expression of a considerable thickness (around 1.7 km) of basalt, underlain by sediments. Identification of these basalts in offshore areas along the northwestern continental shelf of India would support (1) the idea that the onshore Deccan basalts of western India and the rhyolitic tuffs at the Laccadive ridge system (DSDP Site 210) are related to the same volcanic events, and (2) subsequent downfaulting of onshore Deccan basalts into the Arabian Sea and submergence below the Tertiary sediments
 
Date 1995-04-12T09:56:53Z
2017-09-29T13:47:01Z
1995-04-12T09:56:53Z
2017-09-29T13:47:01Z
1977
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, vol.18; 1977; 504-508
0016-7622
http://drs.nio.org/drs/handle/2264/5427
 
Language en
 
Relation J Geol Soc India
SCI
 
Publisher Geological Society of India