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Synthesis of morphotectonics and volcanics of the Central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Synthesis of morphotectonics and volcanics of the Central Indian Ocean Basin
 
Creator Mukherjee, A.D.
Iyer, S.D.
 
Subject ocean basins
plate tectonics
volcanism
topographic features
petrology
magma
hydrothermal activity
pumice
 
Description The Central Indian Ocean Basin (CIOB) is an enigmatic ocean basin in the young and tectonically complex Indian Ocean. Major tectonic and volcanic forms identified are fracture zones, abyssal hills, seamounts and ridges and a unique zone of intraplate deformation. Petrology indicates the presence of basalts, ferrobasalts and spilites. The basalts have erupted from moderately evolved magmas, the ferrobasalts from a long residing and shallow seated magma body while the spilites have formed due to the hydrothermal effect on the pre-existing subalkaline basalts. Besides these rocks, there is a wide occurrence of pumice of probably in situ origin. A distinct relation occurs between the morpho-tectonic forms and the volcanics. For example, in and around the topographic highs, pillow and massive basalts are common while close to fracture zones, flow lavas occur. Two significant volcanic activities: one during the formation of the near-axis generated seamounts and the other in an intraplate environment are perceived
 
Date 2009-01-10T10:23:29Z
2009-01-10T10:23:29Z
1999
 
Type Journal Article
 
Identifier Current Science, Vol.76; 296-304p.
http://drs.nio.org/drs/handle/2264/1760
 
Language en
 
Rights Copyright [1999]. 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, India