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Record of the Cretaceous magnetic quiet zone: A precursor to the understanding of evolutionary history of the Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Record of the Cretaceous magnetic quiet zone: A precursor to the understanding of evolutionary history of the Bay of Bengal
 
Creator Ramana, M.V.
Subrahmanyam, V.
Sarma, K.V.L.N.S.
Desa, M.
Rao, M.M.M.
Subrahmanyam, C.
 
Subject plate tectonics
magnetic data
cretaceous
 
Description Magnetic study along a transect joining the sites of Ocean Drilling Programme (OPD) keg 116 (1 degrees S, 81 degrees 24'E) and the vicinity of Deep Sea Drilling Project (DSDP) site 218 (7 degrees N, 87 degrees 30'E) revealed the presence of a wide magnetic smooth zone sandwiched between the known Late Cretaceous anomaly A34 (approx equal to 84 Myr) and the younger magnetic anomaly sequence of Early Cretaceous crust, reproesnted by MO (approx equal to 118 Myr). The smooth magnetic zone seems to have evolved during the Cretaceous long normal polarity epoch (superchron K-T) 118-84 Ma and is usually referred to as the Cretaceous magnetic quiet zone. Identification of this zone in the distal Bengal Fan perhaps serves as a missing link between the Early Cretaceous and the Late Cretaceous evolution of the crust and establishes a continuous evolutionary record of the Bay of Beangal since India's breakup from the estern Gondwanaland continents.
 
Date 2009-01-12T09:18:24Z
2009-01-12T09:18:24Z
1997
 
Type Journal Article
 
Identifier Current Science, Vol.72; 669-673p.
http://drs.nio.org/drs/handle/2264/2054
 
Language en
 
Rights Copyright [1997]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Current Science Association, Bangalore