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A new report of serpentinites from Northern Central Indian Ridge (at 6 degrees S) - An implication for hydrothermal activity

DRS at CSIR-National Institute of Oceanography

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Title A new report of serpentinites from Northern Central Indian Ridge (at 6 degrees S) - An implication for hydrothermal activity
 
Creator Ray, Dwijesh
Banerjee, R.
Iyer, S.D.
Mukhopadhyay, S.
 
Subject serpentinite
sepentinisation
hydrothermal alteration
 
Description Abstract: Serpentinites from the inside corner high (6O38.5'SI 6S019.34'E) from the Northern Central Indian Ridge (NCIR) are comprised mainly of high Mg-rich lizardite and chrysotile pseudomorphs with varying morphologies. 'Meshrim', 'window', 'hourglass' and 'bastite' are the most common
textures displayed by both chrysotile and liuardite. Numerous chrysotile veins in association with cross cutting magnetite veins indicate an advanced stage of serpentinisation. The relatively high abundance of chrysotile and lizardite suggest their close association and formation at a temperature below 250°C.
Abundant 'mesh rim' and 'bastite' texture and variegated matrix reveal that the present serpentinites might have formed due to the interaction of harzburgite and seawater. Positive Eu anomaly (EuJEu* up
to +3.38), higher LaISm (up to 4.40) and NbLa (up to 6.34) ratios suggest substantial hydrothermal influence during the formation of the serpentinites.
 
Date 2009-01-28T05:12:11Z
2009-01-28T05:12:11Z
2008
 
Type Journal Article
 
Identifier Acta Geologica Sinica, vol. 82(6); 1213-1222
http://drs.nio.org/drs/handle/2264/2414
 
Language en
 
Rights Copyright [2008]. 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 China