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Magnetic expression of some major lineaments and Cretaceous quiet zone in the Bay of Bengal
Authors:A S Subrahmanyam  K S R Murthy  S Lakshminarayana  M M Malleswara Rao  K Venkateswarlu  T C S Rao
Institution:(1) National Institute of Oceanography, Regional Centre, 176, Lawson’s Bay Colony, Visakhapatnam 530 017, India, IN
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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