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Early tertiary seafloor spreading magnetic anomalies and paleo-propagators in the northern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Early tertiary seafloor spreading magnetic anomalies and paleo-propagators in the northern Arabian Sea
 
Creator Chaubey, A.K.
Bhattacharya, G.C.
Murty, G.P.S.
Srinivas, K.
Ramprasad, T.
Rao, D.G.
 
Subject Arabian Sea
magnetic anomalies
propagations
mid-ocean ridges
Laccadive Ridges
hot spots
 
Description Study of closely spaced new marine magnetic profiles, in conjunction with published magnetic data, provide an updated identification of linear magnetic anomalies in the northern Arabian Sea from the Owen Fracture Zone in the west to the Laxmi and Chagos-Laccadive Ridges in the east. For the first time the entire magnetic anomaly sequence 28 through 20 is mapped eastwards from 65~'E up to about 70~'E. Further eastward the post-anomaly 28 oceanic crust appears to have been overlain by the volcanic material forming the Chagos-Laccadive Ridge. Contrary to earlier interpretations, the identified magnetic lineations are observed to have been segmented mainly by oblique offsets representing the pseudofaults associated with 11 major paleo-propagating ridges. These ridge propagation eventscommenced around anomaly 28 time (~6 63 Ma) and continued at least until anomaly 23 time (~6 52 Ma) and during the process a large amount of crust was transferred from the African plate to the Indian plate. The pre-anomaly 24 period was characterized by ridge reorientation, whereas such a phenomenon was not apparent durign the post-anomaly 24 period. Almost all these propagating ridges appear to have been propagating westward, probably to migrate away from the proximity of the Reunion hotspot. The accretionary process of the Early Tertiary oceanic crust in the Arabian Sea thus appears to have been greatly influenced by the propagating ridges and the nearly hotspot.
 
Date 2008-02-22T05:31:27Z
2008-02-22T05:31:27Z
1998
 
Type Journal Article
 
Identifier Earth and Planetary Science Letters, Vol.154; 41-52p.
http://drs.nio.org/drs/handle/2264/965
 
Language en
 
Rights Copyright [1998]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Elsevier