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Source and nature of ore-forming fluids of the Edmond hydro-thermal field, Central Indian Ridge:evidence from He-Ar isotope composition and fluid inclusion study

机译:中印度洋脊埃德蒙德热液田成矿流体的来源和性质:来自He-Ar同位素组成和流体包裹体研究的证据

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摘要

To understand the source and nature of the ore-forming fluids of the Edmond hydrothermal field on the Central Indian Ridge, we studied the He-Ar isotope composition and fluid inclusions of the hydrothermal precipitates. Our results show that the sulfide samples contain noble gases He, Ne, Kr, and Xe with their abundances in between those of air-saturated water (ASW) and mid-ocean ridge basalt (MORB). The3He/4He ratio varies from 1.3 to 8.7 Ra (n=10, average: 5.1 Ra), whereas the40Ar/36Ar ratio is from 285.3 to 314.7 (n=10, average: 294.8). These results suggest that the He was derived from a mixture of MORB with variable amounts of seawater, but the Ar in the ore-forming fluids trapped in the sulfides is predominantly derived from seawater. The fluid inclusions of barite have a wide range of homogenization temperatures and salinities varying from 163°C to 260°C and 2.6 wt%to 8.5 wt% NaCl equiv., respectively. It is suggested that the ore-forming fluids were produced by phase separation, which agreed with the present-day vent fluid study.
机译:为了了解中印第安岭上埃德蒙德热液田的成矿流体的来源和性质,我们研究了热液沉淀物中的He-Ar同位素组成和流体包裹体。我们的结果表明,硫化物样品中的稀有气体He,Ne,Kr和Xe的丰度介于空气饱和水(ASW)和中海脊玄武岩(MORB)之间。 3He / 4He比在1.3至8.7 Ra(n = 10,平均值:5.1 Ra)之间变化,而40Ar / 36Ar比在285.3至314.7(n = 10,平均值:294.8)之间变化。这些结果表明,He是由MORB与不同量的海水的混合物衍生而来的,但被硫化物捕集的成矿流体中的Ar主要来自海水。重晶石的流体包裹体的均质温度和盐度范围分别从163°C至260°C和2.6 wt%至8.5 wt%NaCl当量。建议成矿流体是通过相分离产生的,这与目前的排放流体研究相吻合。

著录项

  • 来源
    《海洋学报(英文版)》 |2017年第1期|101-108|共8页
  • 作者单位

    Key Laboratory of Submarine Geosciences, Second Institute of 0ceanography, State 0ceanic Administration, Hangzhou 310012, China;

    Key Laboratory of Submarine Geosciences, Second Institute of 0ceanography, State 0ceanic Administration, Hangzhou 310012, China;

    Key Laboratory of Submarine Geosciences, Second Institute of 0ceanography, State 0ceanic Administration, Hangzhou 310012, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-19 03:57:49
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