Cu-Zn isotope compositions of hydrothermal sediments from the southern Mid-Atlantic Ridge:implications to the sediment formation and mineral exploration

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外文摘要：Six hydrothermal sediment samples were collected from the Xunmei and Tongguan hydrothermal fields along the southern Mid-Atlantic Ridge during the China Ocean Cruise DY46 in 2017.Sulfides and oxides in the samples were separated,and Cu and Zn isotope compositions were analyzed.Results show that the ranges of δ65Cu values of the bulk sediments,sulfides,and oxides were 0.36‰-2.46‰,-0.21‰-1.10‰,and 0.68‰-1.52‰,respectively.The δ65Cu values of sulfides in four samples(46Ⅱ-14,46Ⅱ-30,46Ⅲ-06,and 46Ⅱ-09)were relatively low(-0.21‰-0.50‰),corresponding to the δ65Cu values of sulfides from inactive old hydrothermal chimneys in northern Mid-Atlantic Ridge(nMAR),suggesting that the sulfides in the sediments were originated from collapsed dead chimney mainly.While the δ65Cu values of the other two samples(46Ⅲ-02 and 46Ⅲ-08)were relatively high(1.10‰-0.96‰),corresponding to the δ65Cu values for active hydrothermal chimneys sulfides in nMAR,which indicated that the sulfides in these two samples might mainly come from sulfide particles settled from active hydrothermal plume.Because of the high density of sulfide particles,they tended to settle near the hydrothermal vents first.Therefore,high δ65Cu values of sulfides in 46Ⅲ-02 and 46Ⅲ-08 implied that undiscovered active hydrothermal vents near the sampling positions of 46Ⅲ-02 in the Xunmei hydrothermal field and 46Ⅲ-08 in the Tongguan hydrothermal field.The δ66Zn values of hydrothermal sediments and sulfides ranged 0.11‰-0.43‰ and 0.29‰-0.67‰,respectively.In the four samples from the Xunmei hydrothermal field,a positive correlation was found between the distance of the sampling position from sulfide mineralized spot and the Zn isotopic ratio,showing that the greater the distance from the mineralized spot,the heavier the Zn isotope composition as seen in two samples(46Ⅱ-30 and 46Ⅱ-14)of the Xunmei-3 spot.This result aligned with the findings of Wilkinson et al.(2005)and Baumgartner et al.(2023),suggesting that the lower the Zn isotope composition,the closer it is to the hydrothermal vent.However,in the Xunmei hydrothermal field,the Zn isotope composition in the other two samples(46Ⅲ-02 and 46Ⅲ-06)showed the opposite trend.This indicated that there might be an active hydrothermal vent near the sampling location of sample 46Ⅲ-02.This observation aligned with the Cu isotope analysis results.This study showed that Cu-Zn isotopes are good indicators for understanding the formation mechanisms of hydrothermal sediments and for locating active hydrothermal vents.

外文关键词：

Cu-Zn isotopehydrothermal sedimentsmineral explorationsouthern Mid-Atlantic Ridge

作者：

Baoju YANG、Lianhua HE、Chuanshun LI、Qiannan HU、Bingfu JIN、Jihua LIU

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作者单位：

School of Resources and Environmental Engineering,Ludong University Yantai 264025,China

Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China

College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China

基金：

National Natural Science Foundation of ChinaLaboratory for Marine Geology,China Ocean Mineral Resources R&D Association ProjectNatural Science Foundation of Shandong ProvinceTalents Research Startup Funding Project of Ludong University

项目编号：

42106080DY135-S2-2-03ZR2020QD074

出版年：

2024

DOI：

10.1007/s00343-024-3209-7

海洋湖沼学报(英文版)

中国海洋湖沼学会

海洋湖沼学报(英文版)

CSTPCD

影响因子：0.386

ISSN：2096-5508

年,卷(期)：2024.42(5)