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Depth anomalies in the Arabian Basin, NW Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Depth anomalies in the Arabian Basin, NW Indian Ocean
 
Creator Ajay, K.K.
Chaubey, A.K.
 
Subject Indian Ocean
Arabian Basin
sediments
upwelling
Laccadive Ridge
 
Description Unreported depth anomalies in the Arabian Basin, northwest Indian Ocean is presented previously, to provide constraints on the evolution of the oceanic lithosphere of that basin. The depth anomaly reported in this study was calculated as the difference between the observed depth to oceanic basement (corrected for sediment load) and the calculated depth to oceanic basement of the same age. The results indicate an anomalous depth to basement of oceanic crust in the Arabian Basin in the age bracket of 63-42 Ma, suggesting that subsidence in this basin does not follow the age-depth relationship of normal oceanic crust. The depth anomalies in the basin vary from +501 to −905 m. A negative depth anomaly zone, mapped in the eastern part of the basin near the Laccadive Ridge, indicates that here the basement depth is shallower than predicted. By contrast, a positive depth anomaly zone, mapped in the western part of the basin, indicates a deeper basement depth than expected. It is proposed that the excess subsidence of basement of the western part of the basin is probably caused by a relatively cold mantle, compared to the nearby eastern part of the basin which is affected by the intense thermal field of the former Reunion hotspot. Here, the rise in oceanic basement is caused by the vertical upwelling of oceanic crust due to convection, followed by a lateral across-axis flow facilitated by the Reunion hotspot at the time of spreading in early Tertiary times. This interpretation is in good agreement with spreading-ridge propagation and ridge-hotspot interaction reported earlier for the basin.
 
Date 2008-02-22T05:31:26Z
2008-02-22T05:31:26Z
2008
 
Type Journal Article
 
Identifier Geo-Marine Letters, Vol.28(1); 15-22p.
http://drs.nio.org/drs/handle/2264/961
 
Language en
 
Rights Copyright [2008]. 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 If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.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 Springer