Record Details

Marine geophysical studies off Karwar, West Coast of India

DRS at CSIR-National Institute of Oceanography

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Title Marine geophysical studies off Karwar, West Coast of India
 
Creator Subrahmanyam, V.
Ramana, M.V.
SubbaRaju, L.V.
 
Subject Geology and Geophysics
Geology and Geophysics
continental margins
topography
ridges
magnetic anomalies
continental shelves
gravity data
models
ISW, India, Karnataka, Karwar
 
Description Geophysical studies of the southwestern continental margin revealed significant surface and subsurface topographic highs (ridges) trending NNW-SSE to NW-Se beyond the shelf break. Residual magnetic anomaly map depicts prominent NNW-SSE, NW-SE and E-W trends. The magnetic anomaly map also reveals three different provinces, A, B and C, based on magnetic signatures, confined to inner shelf, outer shelf and lower shelf. A prominent E-W trending structural lineament with a NW-SE trending offset is observed cutting across the inner shelf and the lower shelf. Model studies of the geopotential data over the topographic rise indicate about 18 km thick mafic basement of continental origin at a shallow depth (~800 m). The gravity model studies indicate a thick consolidated sediment layer deposited over the horst and grabenlike features within the granitic layer. The occurrence of ridges parallel to the shelf edge shows the similarity of the western Indian continental margin with the outer typical and extensively studies passive margins
 
Date 1997-12-01T10:01:55Z
2017-09-30T01:29:56Z
1997-12-01T10:01:55Z
2017-09-30T01:29:56Z
1989
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, vol.34(2); 1989; 121-132
0016-7622
http://drs.nio.org/drs/handle/2264/7228
 
Language en
 
Relation J Geol Soc India
SCI
 
Publisher Geological Society of India