现代海底热液沉积物的硫同位素组成及其地质意义

曾志刚; 蒋富清; 秦蕴珊; 翟世奎

现代海底热液沉积物的硫同位素组成及其地质意义

1.
中国科学院海洋研究所, 山东青岛266071
2.
青岛海洋大学海洋地球科学学院, 山东青岛266003

基金项目: 国家自然科学基金资助项目(49736210);国家重点基础研究发展规划资助项目(G2000046703)

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出版历程
- 收稿日期: 1999-09-15
- 修回日期: 2000-08-28

Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
College of Marine Geosciences, Ocean University of Qingdao, Qingdao 266003, China

摘要

摘要: 共收集到现代海底热液沉积物的1264个硫同位素数据,结合我们对冲绳海槽Jade热液区和大西洋中脊TAG热液区中表层热液沉积物的硫同位素研究成果,对比分析了不同地质-构造环境中海底热液沉积物的硫同位素组成特征及其硫源问题.结果表明:(1)现代海底热液沉积物中硫化物的硫同位素组成集中分布在1‰～9‰之间,均值为4.5‰(n=1042),而硫酸盐矿物的硫同位素组成主要分布在19‰～24‰之间,均值为21.3‰(n=217);(2)无论在洋中脊还是在弧后盆地扩张中心,无沉积物覆盖热液活动区中热液沉积物与有沉积物覆盖热液活动区相比,其硫同位素组成的分布范围相对狭窄;(3)各热液活动区中硫化物硫同位素组成的不同,反映出各自硫源的差异性.无沉积物覆盖洋中脊中热液成因硫化物的硫主要来自玄武岩,部分来自海水,是玄武岩和海水硫酸盐中硫不同比例混合的结果,而在弧后盆地和有沉积物覆盖的洋中脊,除了火山岩以外,沉积物和有机质均可能为热液硫化物的形成提供硫;(4)现代海底热液沉积物硫同位素组成的变化和硫源的不同可能归因于海底热液体系中流体物理化学性质的变化、岩浆演化和构造-地质背景的不同.
- 现代海底热液沉积物 /
- 硫同位素组成 /
- 地质意义
Abstract: A total of 1 264 sulfur isotopic values for modern seafloo rhydrothermal sediments from different hydrothermal fields have been collected.Sulfur isotopic data for surface hydrothermal sediments from the Jade hydrothermal field in the Okinawa Trough with the TAG hydrothermal field in the Mid-Atlantic Ridge,spectively. Comparing the sulfur isotopic compositions and discussing their sources of sulfur in seafloor hydrothermal sediments from different geologic-tectonic setting are comared and their soures of sulfurard discussed.The results show that: (1)Sulfur isotopic values of sulfides and sulfates in modern seafloor hydrothermal sediments are mostly concentrated in a narrow range,δ³⁴ S values of sulfides vary from 1‰ to ~9‰,with a mean of 4.5‰(n=1042),δ³⁴ S values of sulfates vary from 19‰ to ~24‰,with a mean of 21.3‰(n=217);(2)Comparing the sulfur isotopic compositions of hydrothermal sediments from the sedimen-thosted hydrothermal fields,the range of sulfiur isotopic values for hydrothermal sediments from the sediment-free hydrothermal fields is narrow relatively;(3)The differences of sulfur isotopic compositions in sulfides from different hydrothermal fields show the differences in the sources of sulfur.The sulfur of hydrothermal sulfides in the sediment-free mid-ocean ridges is mainely from mid-coean ridge basalt,and partial from reduced sea water sulfate,it is the result of totally to partially reduced sea water sulfate mixing with basaltic sulfur.And in the sedimen-thosted mid-ocean ridges and the back-arc basins,besides the volcanics,the sediments and the organic matters also can offer their sulfur for forming hydrothermal sulfides;(4)The variations of sulfur isotopic compositions and the different sources of sulfur for hydrothermal sediments may probably be attributed to the variations of physical-chemical properties of hydrothermal fluids,the magmatic evolution and the different geologic-tectonic settings of seafloor hydrothermal systems.
- modern seafloor hydrot hermal sediment /
- sulfur isotopic composition /
- geologic significance

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