| 洋中脊热液系统中的锇及其同位素 |
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| 引用本文： | 黄威,陶春辉,李军,孙治雷,邓希光,崔汝勇.洋中脊热液系统中的锇及其同位素[J].地球科学,2016,41(3):441-451. |
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| 作者姓名： | 黄威 陶春辉 李军 孙治雷 邓希光 崔汝勇 |
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| 作者单位： | 1.青岛海洋地质研究所、国土资源部海洋油气资源与环境地质重点实验室，山东青岛 266071 |
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| 基金项目： | 中国科学院海洋地质与环境重点实验室开放基金MGE2012KG06国土资源部海洋油气资源与环境地质重点实验室开放基金MRE-201235国际海域资源调查与开发“十二五”课题DY125-11-R-06国家自然科学基金项目41506074国土资源部海底矿产资源重点实验室开放基金KLMMR-2013-B-01 |
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| 摘 要： | 洋中脊热液系统是将相对富集在深部的Os运移到海底表面的重要媒介，同时该过程也是全球Os循环的重要组成部分.在归纳总结洋中脊热液系统各物源组分和产物中Os的化学形态、含量及其同位素组成特征的基础上，探讨了Os在洋中脊热液活动各阶段中的分布演化规律及物源贡献特征.在缺乏沉积物覆盖的洋中脊区域，热液系统中的Os及其同位素组成特征主要受控于海水和不同构造环境下洋壳组分特征的差异以及这两种物源组分混合比例的不同.经历了海底之下的水岩反应后，围岩会将下渗海水中的部分放射性成因Os固定，而将自身富集的非放射性成因Os释放进入热液流体中.堆积在海底之上的各种热液产物中的Os大多来自海水，而海底之下的热液产物则因为海水下渗深度以及海水与热液流体混合程度的差异而体现出宽泛的Os含量和187Os/188Os比值变化范围.
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| 关 键 词： | 洋中脊 热液系统 Os 同位素 |
| 收稿时间： | 2015-12-23 |
Osmium Isotopic Compositions and Osmium Distribution in the Mid-Ocean Ridge Hydrothermal System |
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| Abstract: | The hydrothermal fluids occur along the mid-ocean ridges are capable of transporting a great amount Os from deep interior of the earth where it is relatively enriched to the ocean floor, this process plays a significant role in the global cycling of Os. The geochemical behavior of Os during the various stages of the hydrothermal circulation, its distribution and evolution features and source contributions are estimated basing on the chemical speciation, concentrations and isotopic compositions of Os in the sources for the hydrothermal systems and the hydrothermal deposits. The Os data from the sediment-free mid-ocean ridge systems indicated that there is a nearly complete Os isotope exchange between the interacting seawater and the oceanic crust during the hydrothermal circulation, the behavior of Os appears to be controlled by the relative proportions of seawater and crustal composition in the different tectonic areas. Reactions of seawater with surrounding rock result in the radiogenic Os removing from seawater to the altered host rock, and the nonradiogenic Os lost from the wall rock to the hydrothermal fluid. The hydrothermal deposits accumulated above the seafloor carry Os which is predominately seawater-derived, the Os of the hydrothermal products beneath the the seafloor reflecting mixing of seawater-derived and ocean crust-derived Os. |
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