西南印度洋中脊热液硫化物成矿物质来源探讨:同位素证据

报道了西南印度洋中脊47°E~55°E洋脊段热液区硫化物中 He、Pb和 Cu同位素特征,探讨了热液硫化物成矿物质来源特征。结果表明:硫化物N(^3 He)/N(^4 He)值变化范围较大(R/R a=0.85~7.02),显示洋中脊玄武岩和海水对He来源具有不同贡献,硫化物中He主要来源于洋中脊玄武岩,也有部分放射性成因 He的混入;热液硫化物 Pb 同位素比值变化范围很小(N (^206 Pb)/N(^204 Pb)=18.196~18.239,N (^207 Pb)/N (^204 Pb)=15.479~15.490和 N (^208 Pb)/N (^204 Pb)=37.951~38....

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Published in地球科学与环境学报 Vol. 36; no. 1; pp. 193 - 200
Main Author 李小虎 初凤友 雷吉江 赵宏樵 余星
Format Journal Article
LanguageChinese
Published 国家海洋局第二海洋研究所,浙江 杭州 310012 2014
国家海洋局海底科学重点实验室,浙江 杭州 310012
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ISSN1672-6561

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Summary:报道了西南印度洋中脊47°E~55°E洋脊段热液区硫化物中 He、Pb和 Cu同位素特征,探讨了热液硫化物成矿物质来源特征。结果表明:硫化物N(^3 He)/N(^4 He)值变化范围较大(R/R a=0.85~7.02),显示洋中脊玄武岩和海水对He来源具有不同贡献,硫化物中He主要来源于洋中脊玄武岩,也有部分放射性成因 He的混入;热液硫化物 Pb 同位素比值变化范围很小(N (^206 Pb)/N(^204 Pb)=18.196~18.239,N (^207 Pb)/N (^204 Pb)=15.479~15.490和 N (^208 Pb)/N (^204 Pb)=37.951~38.023),与西南印度洋中脊玄武岩 Pb 同位素比值较大的变化范围相比,热液流体循环过程中Pb同位素发生了明显均一化;硫化物单矿物 Cu同位素组成均为正值(δ(^64 Cu)=(0.02~0.52)×10^-3),显示西南印度洋中脊热液硫化物呈现略微富集 Cu重同位素特征;西南印度洋中脊热液硫化物中 He、Pb和 Cu同位素记录了热液喷口流体和金属源区特征,热液硫化物成矿物质主要来源于洋中脊玄武岩和海水,但明显经历了热液流体再循环和后期改造过程。
Bibliography:61-1423/P
LI Xiao-hu, CHU Feng-you, LEI Ji-jiang, ZHAO Hong-qiao, YU Xing (1. Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, Zhejiang, China; 2. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, Zhejiang, China)
geochemistry;hydrothermal sulfide;isotope;source;mineralization;Southwest Indian Ridge
The source of hydrothermal fluid and metals of deposit is very important to understand mineralization of hydrothermal sulfide on the mid-ocean ridge. He, Pb and Cu isotopic characteristics of hydrothermal sulfide from the section of ocean ridge (47°E-55°E)of Southwest Indian Ridge were analyzed,and the characteristics of mineralization sources of hydrothermal sulfide deposit were discussed.The results show that the range of N(^3 He)/N(^4 He)of sulfide is wide with the R/R a of 0.85-7.02,so that the contributions of mid-ocean ridge basalt (MORB) and seawater to the sources of He are different,and the main source of He of sulfide is MORB with rad
ISSN:1672-6561