洋中脊热液系统中的锇及其同位素

黄威; 陶春辉; 李军; 孙治雷; 邓希光; 崔汝勇

doi:10.3799/dqkx.2016.036

洋中脊热液系统中的锇及其同位素

doi: 10.3799/dqkx.2016.036

黄威^1,2,3,,
陶春辉^3,4, ,,
李军¹,
孙治雷¹,
邓希光²,
崔汝勇¹

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
2.
广州海洋地质调查局、国土资源部海底矿产资源重点实验室，广东广州 510075
3.
中国地质大学地球物理与空间信息学院，湖北武汉 430074
4.
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，浙江杭州 310012

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

详细信息

作者简介:
黄威(1981-)，助理研究员，博士，从事现代海底热液系统的贵金属成矿作用研究. E-mail: qimg_huangwei@sina.com

通讯作者:
陶春辉, E-mail: taochunhuimail@163.com

中图分类号: P736.4
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出版历程
- 收稿日期: 2015-12-23
- 刊出日期: 2016-03-15

Osmium Isotopic Compositions and Osmium Distribution in the Mid-Ocean Ridge Hydrothermal System

Huang Wei^{1,2,3
,},
Tao Chunhui^{3,4
, ,},
Li jun¹,
Sun Zhilei¹,
Deng Xiguang²,
Cui Ruyong¹

1.
Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
2.
Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou Marine Geological Survey, Guangzhou 510075, China
3.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
4.
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

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.
- 洋中脊 /
- 热液系统 /
- Os /
- 同位素
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.
- Mid-ocean ridge /
- Hydrothermal system /
- Osmium /
- isotopics

HTML全文

图 1 Os在洋中脊热液系统中的循环过程

底图改编自美国国家海洋和大气管理局网站(http://oceanexplorer.noaa.gov/explorations/02fire/background/vent_chem/media/chemistry.html)，圆括号中从左到右依次标注的是热液系统各端元和产物的Os同位素组成特征及Os含量的平均值(单位为10^-12)，方括号中标注的是其可能的组成形态，数据出处见下文

Fig. 1. The cycle process of Os in the mid-ocean ridge hydrothermal system

下载: 全尺寸图片幻灯片

图 2 高温和低温热液流体的Os含量的倒数与Os同位素组成之间的关系

高温和低温热液流体数据引自Sharma et al.(2000, 2007)；海水的数据引自Levasseur(1998)、Woodhouse et al.(1999)、Chen and Sharma(2009)；洋壳的数据引自Peucker-Ehrenbrink et al.(2012)

Fig. 2. Os contents versus ¹⁸⁷Os/¹⁸⁸Os plots for the high temperature and low temperature fluids

下载: 全尺寸图片幻灯片

图 3 热液硫化物的Os含量与Os同位素组成之间的关系

表层硫化物数据引自Ravizza et al.(1996)、Zeng et al.(2014)；深部硫化物数据引自Brügmann et al.(1998)；海水的数据引自Levasseur(1998)、Woodhouse et al.(1999)、Chen and Sharma(2009)；洋壳的数据引自Peucker-Ehrenbrink et al.(2012)

Fig. 3. Os concentrations versus ¹⁸⁷Os/¹⁸⁸Os plots for the hydrothermal massive sulfide

下载: 全尺寸图片幻灯片

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