文献类型：期刊文献

英文题名：Isotope geochemistry of Zn, Pb and S in the Ediacaran strata hosted Zn-Pb deposits in Southwest China

作者：Zhu, Chuanwei Wang, Jian Zhang, Jiawei Chen, Xiaocui Fan, Haifeng Zhang, Yuxu Yang, Tao Wen, Hanjie

第一作者：Zhu, Chuanwei

通信作者：Wen, HJ[1]

机构：[1]Minist Nat Resources, Key Lab Submarine Geosci, Inst Oceanog 2, State Ocean Adm, Hangzhou 310012, Peoples R China;[2]Chinese Acad Sci, Inst Geochem, SKLODG, Guiyang 550002, Peoples R China;[3]China Univ Geosci, Fac Earth Resources, Wuhan 430074, Peoples R China;[4]Guizhou Geol Survey, Bur Geol & Mineral Explorat & Dev Guizhou Prov, Guiyang 550081, Peoples R China;[5]Guizhou Inst Technol, Guiyang 550003, Peoples R China;[6]Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China

第一机构：Minist Nat Resources, Key Lab Submarine Geosci, Inst Oceanog 2, State Ocean Adm, Hangzhou 310012, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, SKLODG, Guiyang 550002, Peoples R China.

年份：2020

卷号：117

外文期刊名：ORE GEOLOGY REVIEWS

收录：;EI(收录号：20195207933875);Scopus(收录号：2-s2.0-85076956163);WOS:【SCI-EXPANDED(收录号:WOS:000515206900045)】；

基金：This project was financially supported by the National Key R&D Program of China (2017YFC0602500), National Natural Science Foundation of China (Nos. 4160020815, 41773012, 41503011), Guizhou Scientific and Technology Planning Project, China (QKHPTRC[2018]5626), and the Science and Technology Foundation of Guizhou Province ([2016]1159 and [2019]1459). Journal reviewers are gratefully acknowledged for their helpful comments that allowed us to improve the manuscript.

语种：英文

外文关键词：Zn isotope; Sulfide; Cd/Zn ratio; Geochemical tracer

摘要：The Sichuan-Yunnan-Guizhou (SYG) area is a world-class Zn-Pb metallogenic zone and contains over four hundred of carbonate-hosted hydrothermal Zn-Pb deposits, six of which are super large-scale deposits with significant sources of Cd, Ge, and Ag, including the Huize, Wusihe, Xiaoshifang, Maozu, Tianbaoshan and Daliangzi deposits. Although previous studies focused fully on these deposits, the ore genesis of which are still in controversial. Interestedly, four of those super large scale deposits are hosted in the Ediacaran Dengying Formation, including the Maozu, Wusihe, Tianbaoshan and Daliangzi deposits. Based upon previous studies, we investigate the extent, causes and consequences of Zn and Pb isotope signatures at hand specimen scale and ore genesis of the Daliangzi and Tianbaoshan deposits, associated with published data for the Wusihe deposit. Lead isotope ratios, coupled with published data, demonstrate that Pb in the studied deposits was predominantly derived from two components: basements and sedimentary rocks. Meanwhile, a strong positive linear correlation between delta Zn-66 and delta S-34(CDT) values was observed in hand specimen D-2084, suggesting the variations may be resulted by fluid mixing. Furthuremore, the Zn isotope and Cd/Zn dataset from the Tianbaoshan, Daliangzi and Wusihe deposits defines a logarithmic curve (R-2 = 0.82), which, to our knowledege, is firstly reported and lies between two indentified components: a low Cd/Zn end-member with high delta Zn-66 values and a high Cd/Zn end-member with low delta Zn-66 values. Based upon previous studies, we suggest that Zn and Pb in the Wusihe and Tianbaoshan deposits were predominantly derived from basements and Ediacaran sediments; in contrast, Zn and Pb in the Daliangzi deposit were predominantly derived from Ediacaran sediments and upper sedimentary rocks, but we cannot rule out metal contributions of the basements. Furthermore, we suggest that fluid mixing is more propreate to better explain Zn isotope signatures in the studied deposits. In summary, Zn and Pb isotope ratios reflect similar ore genesis and metal sources of the Daliangzi, Tianbaoshan and Wusihe Zn-Pb deposits in the SYG area. The application to the studied deposits with the discovery of Zn, S and Pb isotope compositions for sulfides indicates the potential of Zn isotope, combined with Cd/Zn raito, as new geochemical tracers, which may be useful for distinguishing the metal sources in large hydrothermal systems as suggested previously.