Evidences for seawater–rock hydrothermal interaction in the serpentinites from Northern Central Indian Ridge

Serpentinites and serpentinized harzburgites were collected from a ridge-transform intersection at 6°39′S–68°19′E from the Northern Central Indian Ridge. The degree of serpentinization is extensive and varies from 90 to 100%. Olivine and orthopyroxene are largely pseudomorphed to lizardite-chrysotil...

Full description

Saved in:
Bibliographic Details
Published in:Current science (Bangalore) 2009-10, Vol.97 (8), p.1239-1243
Main Authors: Ray, Dwijesh, Banerjee, Ranadip, Iyer, Sridhar D., Mukhopadhyay, Subir
Format: Article
Language:English
Subjects:
Geochemistry
Low temperature
Marine
Oceans
Olivine
Peridotite
RESEARCH COMMUNICATIONS
Ridges
Rock textures
Sea water
Serpentine
Veins
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Serpentinites and serpentinized harzburgites were collected from a ridge-transform intersection at 6°39′S–68°19′E from the Northern Central Indian Ridge. The degree of serpentinization is extensive and varies from 90 to 100%. Olivine and orthopyroxene are largely pseudomorphed to lizardite-chrysotile 'mesh' and 'bastite' respectively. Numerous serpentine vein network associated with clusters of magnetite are also present. On the basis of mineralogical paragenesis, mineral chemistry and bulk rock analyses, we infer that the present serpentinites might have formed due to the interaction of harzburgites and seawater at a low temperature. Additionally, positive Eu anomaly, higher La/Sm and low Nb/La ratios suggest substantial hydrothermal input during the onset of serpentinization.
ISSN:0011-3891