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Precambrian mega lineaments across the Indian sub-continent - Preliminary evidence from offshore magnetic data

DRS at CSIR-National Institute of Oceanography

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Title Precambrian mega lineaments across the Indian sub-continent - Preliminary evidence from offshore magnetic data
 
Creator Subrahmanyam, V.
Subrahmanyam, A.S.
Murthy, K.S.R.
Murty, G.P.S.
Sarma, K.V.L.N.S.
SuneetaRani, P.
Anuradha, A.
 
Subject Magnetic data
mega lineaments shear zones
 
Description Marine and airborne magnetic data over south Indian continent including the western and eastern continental margins between latitudes 12°30`N and 10°N were studied and interpreted. The total intensity magnetic anomalies over the south Indian continental block between 10°45`N and 12°30`N exhibit distinct character compared to the adjoining northern and southern blocks. The study revealed the presence of two Precambrian mega lineaments over a stretch of 750–800 km running in east-west direction. They were mapped approximately from the isobath of 1500 m in the western continental margin, across the south Indian Peninsula and through the eastern continental margin up to a water depth more than 3000 m. These mega lineaments may be acting as a crustal junction/contact between two major geological provinces, viz. the Southern Granulite Terrain (SGT) and the Dharwar Craton. In addition to these two mega lineaments, major faults have been inferred, which acted as controlling parameters to create a bulge/ bite in the coastline off Cuddalore. The continent–ocean boundary/transition on the Eastern Continental Margin of India (ECMI) may be the offshore boundary for these two Precambrian mega lineaments
 
Date 2006-06-21T12:09:25Z
2006-06-21T12:09:25Z
2006
 
Type Journal Article
 
Identifier Current Science, vol. 90(4), 578-581
http://drs.nio.org/drs/handle/2264/146
 
Language en
 
Format 147456 bytes
application/pdf
 
Publisher Indian Academy of Sciences