Magnetic expression of some major lineaments and Cretaceous quiet zone in the Bay of Bengal |
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| Authors: | A S Subrahmanyam K S R Murthy S Lakshminarayana M M Malleswara Rao K Venkateswarlu T C S Rao |
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| Institution: | (1) National Institute of Oceanography, Regional Centre, 176, Lawson’s Bay Colony, Visakhapatnam 530 017, India, IN |
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| Abstract: | Magnetic data over the eastern continental margin of India and adjacent Bengal fan demarcate two major lineaments. A high
amplitude N–S-trending lineation of the Cauvery offshore Basin corresponds to the offshore fragment of the 80°E lineament
recorded onland. A N–S lineation of very high amplitude anomaly off Chilka lake considered as the possible northward extension
of the 85°E ridge delineated, hitherto in Bengal Fan. A subdued magnetic anomaly zone is demarcated seaward of the continent–ocean
boundary (COB) in the Bengal Fan. Over the northern Bengal Fan this zone is delineated east of 85°E lineation. This quiet
zone might have evolved during the Early Cretaceous period of normal magnetic polarity between M0 and 34 (120–84 Ma) anomalies.
Received: 6 April 1995 / Revision received: 3 September 1996 |
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