地质学报（英文版）2008，Vol.82Issue(6)：1213-1222,10.
A New Report of Serpentinites from Northern Central Indian Ridge (at 6°S)—An Implication for Hydrothermal Activity
A New Report of Serpentinites from Northern Central Indian Ridge (at 6°S)—An Implication for Hydrothermal Activity
摘要
Abstract
Serpentinites from the inside corner high (6°38.5'S/ 68°19.34'E) from the Northern Central Indian Ridge (NCIR) are comprised mainly of high Mg-rich lizardite and chrysotile pseudomorphs with varying morphologies.'Mesh rim','window', 'hourglass'and'bastite'are the most common textures displayed by both chrysotile and lizardite.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 (Eu/Eu*up to +3.38), higher La/Sin (up to 4.40) and Nb/La (up to 6.34) ratios suggest substantial hydrothermal influence during the formation of the Serpentinites.关键词
serpentinite/serpentinisation/hydrothermal alterationKey words
serpentinite/serpentinisation/hydrothermal alteration分类
天文与地球科学引用本文复制引用
Dwijesh RAY,Ranadip BANERJEE,Sridhar D.IYER,Subir MUKHOPADHYAY..A New Report of Serpentinites from Northern Central Indian Ridge (at 6°S)—An Implication for Hydrothermal Activity[J].地质学报（英文版）,2008,82(6):1213-1222,10.基金项目
We thank the Director, NIO, for permission to publish the manuscript. Ship time was provided by the Department of Ocean Development, New Delhi. This research is partly funded by ONR grant No. 0014-97-1-0925 and CSIR Network Programme (COR 0006) on Indian Ocean ridges. We appreciate the help extended by the Captain and crew members onboard ORV Sagar Kanya and other colleagues during the sampling operations. DR is grateful to CSIR, New Delhi, for financial support in the form of a Senior Research Fellowship. We thank Dr. Wang, H.J. for his critical comments and suggestions to improve the manuscript. This is NIO contribution No. 4361 （COR 0006）
