| 中印度洋脊Edmond热液区成矿流体属性与来源:来自流体包裹体和He-Ar同位素的证据 |
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| 引用本文： | 王叶剑,韩喜球,邱中炎.中印度洋脊Edmond热液区成矿流体属性与来源:来自流体包裹体和He-Ar同位素的证据[J].海洋学报(英文版),2017,36(1):101-108. |
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| 作者姓名： | 王叶剑 韩喜球 邱中炎 |
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| 作者单位： | 国家海洋局第二海洋研究所, 国家海洋局海底科学重点实验室, 杭州 310012,国家海洋局第二海洋研究所, 国家海洋局海底科学重点实验室, 杭州 310012,国家海洋局第二海洋研究所, 国家海洋局海底科学重点实验室, 杭州 310012 |
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| 基金项目： | The National Natural Science Foundation of China under contract No. 41306056; the China Ocean Mineral Resources R&D Association Project under contract No. DY125-12-R-03; the Scientific Research Fund of the Second Institute of Oceanography, SOA under contract No. JG1308. |
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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). The ~3He/~4He ratio varies from1.3 to 8.7 R_a(n=10, average: 5.1 R_a), whereas the ~(40)Ar/~(36) Ar 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% Na Cl equiv., respectively. It is suggested that the ore-forming fluids were produced by phase separation, which agreed with the present-day vent fluid study.
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| 关 键 词： | 流体包裹体 He-Ar同位素 相分离 块状硫化物 中印度洋脊 |
| 收稿时间： | 2016/3/25 0:00:00 |
| 修稿时间： | 2016/6/14 0:00:00 |
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 |
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| WANG Yejian,HAN Xiqiu and QIU Zhongyan.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[J].Acta Oceanologica Sinica,2017,36(1):101-108. |
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| Authors: | WANG Yejian HAN Xiqiu and QIU Zhongyan |
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| Institution: | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | 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). The 3He/4He ratio varies from 1.3 to 8.7 Ra (n=10, average: 5.1 Ra), whereas the 40Ar/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. |
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| Keywords: | fluid inclusion helium and argon isotopes phase separation massive sulfides Central Indian Ridge |
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