A New Report of Serpentinites from Northern Central Indian Ridge (at 6oS) — An Implication for Hydrothermal Activity
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This research is partly funded by ONR grant No. 0014-97-1-0925 and CSIR Network Programme (COR 0006) on Indian Ocean ridges.


A New Report of Serpentinites from Northern Central Indian Ridge (at 6oS) — An Implication for Hydrothermal Activity
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    摘要:

    Serpentinites from the inside corner high (6o38.5′S/ 68o19.34′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 250oC. 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/Sm (up to 4.40) and Nb/La (up to 6.34) ratios suggest substantial hydrothermal influence during the formation of the serpentinites.

    Abstract:

    Serpentinites from the inside corner high (6o38.5′S/ 68o19.34′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 250oC. 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/Sm (up to 4.40) and Nb/La (up to 6.34) ratios suggest substantial hydrothermal influence during the formation of the serpentinites.

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Dwijesh RAY, Ranadip BANERJEE, Sridhar D. IYER, Subir MUKHOPADHYAY.2008. A New Report of Serpentinites from Northern Central Indian Ridge (at 6oS) — An Implication for Hydrothermal Activity[J]. ACTA GEOLOGICA SINICA(English edition),82(6):1213~1222

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  • 收稿日期:2007-04-30
  • 最后修改日期:2008-01-22
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