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Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics

DRS at CSIR-National Institute of Oceanography

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Title Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics
 
Creator Mukhopadhyay, R.
Khadge, N.H.
 
Description The Central Indian Ocean Basin (CIOB) was subjected to tectonic reactivation in geological past which is unusual for a basin occurring on an apparently single tectonic plate. ENE-WSW trending latitude parallel zone of reactivation across the central part of the basin is reported. Distinct difference in characters of seamounts, manganese nodules and bottom sediment are found in this deformed central part as compared to those from northern and southern parts of this basin. Much lower ratio of height to basal width (h/Wb) of seamounts; and presence of several guyots in this central part are reported. Abundance of smaller, spheroidal, smooth textured nodules; and absence of index radiolarian zone I fossil, coupled with sediment erosion of top several centimeters indicate activity of west-bound Antarctic Bottom Water (ABW) and other turbulent water masses that later passed through the reactivated central part. The cause of this deformation is attributed to wrench-faulting as part of large scale tectonic reactivation during late Miocene
 
Date 2009-05-08T12:02:02Z
2009-05-08T12:02:02Z
1992
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, Vol.40; 443-452p.
http://drs.nio.org/drs/handle/2264/3061
 
Language en
 
Rights Copyright [1992]. 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 Geological Society of India