Tungsten enriched in submarine hydrothermal fluids
Tungsten enriched in submarine hydrothermal fluids
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DOI：
10.1016/j.epsl.2004.03.034
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发表时间：
2004-06-15
影响因子：
5.3
通讯作者：
Ishibachi, J
中科院分区：
文献类型：
--
作者：
Kishida, K;Sohrin, Y;Ishibachi, J
在这里，我们报告了深海热液喷口流体中W的第一个数据。本文收集了位于中印度洋脊Rodriguez三重交界处的海中脊热液场Kairei田、北太平洋伊豆-波宁弧水洋海山的弧-弧后热液系统以及东海冲绳海槽的Hatoma和Yonaguni丘的热液流体。水热液中W的浓度随Mg浓度的降低呈线性增加，而端元液中W的浓度差异很大。Kairei油田为0.21 nmol/kg， Suiyo海山为15 nmol/kg， Hatoma山为123 nmol/kg，比海水环境水平高4个数量级。W浓度不是Cl、碱度、B和NH4的简单函数。热液区通过与分选钙碱性英安岩和陆源沉积物的反应有效富集W。虽然Mo在含氧海水中是W的化学类似物，但热液流体中的Mo浓度下降到2- nmol/kg，可能是由于Mo硫化物的沉淀。(C) 2004 Elsevier B.V.版权所有
Here we report the first data for W in hydrothermal vent fluids in the deep oceans. Vented hydrothermal fluids were collected from the Kairei Field, a mid ocean ridge hydrothermal field at the Rodriguez Triple Junction, Central Indian Ridge, and from arc-backarc hydrothermal systems at the Suiyo Seamount in the Izu-Bonin Arc, North Pacific Ocean and at the Hatoma and Yonaguni Knolls in the Okinawa Trough, East China Sea. While the dissolved W concentration in hydrothermal fluids linearly increased with a decrease in the Mg concentration for each system, the W concentration in endmember fluids was very different. It was 0.21 nmol/kg at the Kairei Field, 15 nmol/kg at the Suiyo Seamount, and 123 nmol/kg at the Hatoma Knoll, which was 4 orders of magnitude above the ambient level in seawater. The W concentration was not a simple function of Cl, alkalinity, B, and NH4. The hydrothermal fields are efficiently enriched with W through reaction with fractionated calc-alkaline dacite and with terrigenous sediments. Although Mo is a chemical analogue of W in oxic seawater, the Mo concentration decreased in the hydrothermal fluids to 2- nmol/kg probably due to precipitation of Mo sulfide. (C) 2004 Elsevier B.V. All rights reserved.