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New insights into the origin of early Cambrian carbonate-hosted Pb-Zn deposits in South China: A case study of the Maliping Pb-Zn deposit
Luo, Kai1,2,3; Zhou, Jia-Xi1,3,5; Huang, Zhi-Long1; Wang, Xuan-Ce4,5; Wilde, Simon A.5; Zhou, Wei3; Tian, Liyan6,7
2019-06-01
Source PublicationGONDWANA RESEARCH
ISSN1342-937X
Volume70Issue:1Pages:88-103
Abstract

The western margin of the Yangtze Block hosts the giant Upper Yangtze Pb-Zn metallogenic province, with the occurrence of >400 carbonate-hosted Pb-Zn deposits. More than 50% of these deposits are hosted in carbonate rocks of late Ediacaran to early Cambrian age. Although they have attracted great attention over the past two decades, it is still unclear why such carbonate sequences host so many Pb-Zn deposits and the role that the country rocks played during mineralization. The newly-discovered Maliping Pb-Zn deposit (similar to 6 Mt @ 4.18 wt% Pb and 9.18 wt% Zn) is hosted in early Cambrian strata composed of carbonate and phosphate rocks, black shales, as well as evaporite sulfates, of which the carbonate rocks are the direct ore-hosting rocks. Evidence from mineralogy and the concentrations of ore-forming metals indicate that the phosphate rocks played an important role in providing geochemical barriers during Pb-Zn ore formation. Homogenization temperatures of the primary fluid inclusions in sphalerite and quartz range from 185 to 282 degrees C, and their salinities vary from 3.39 to 17.17 wt% NaCl equiv. The REE and C-O isotopes imply that the hydrothermal carbonates were formed under relatively oxidizing conditions and that the wall rocks were involved in the Pb-Zn mineralization through dissolution. Sulfur isotopic compositions (delta S-34 = +7.60-+31.79 parts per thousand) of sulfides reveal that S2- originated from evaporite sulfates within the ore-hosting strata, and that the black shales acted as an important reducing agent during thermo-chemical reduction (TSR). Pb isotopic ratios of galena (Pb-206/Pb-204 = 17.856-17.973, Pb-207/Pb-204 = 15.668-15.689 and Pb-208/Pb-204 = 37.953-38.101) are similar to those of Proterozoic basement rocks in the region. This implies that the basement could be the key source of mineralizing metals. Hence, we propose that: (i) The favorable lithological combination of early Cambrian phosphate rocks, black shales, carbonates and evaporites, as well as Proterozoic basement in the area, were responsible for controlling the majority of Pb-Zn deposits in the late Ediacaran-early Cambrian carbonate sequences in the western Yangtze Block; and (ii) the Maliping Pb-Zn deposit resulted from a combination of mineralized fluids, various trap structures and favorable lithologies, of which the fluids were epigenetic with low to moderate temperatures and salinities. (C) 2019 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

KeywordEarly Cambrian Sedimentary Rocks Proterozoic Basement Rocks Maliping Pb-zn Deposit Upper Yangtze Pb-zn Metallogenic Province
DOI10.1016/j.gr.2018.12.015
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China ; National Key R&D Program of China ; Knowledge Innovation Program of the Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences ; Research Startup Project for Introduced Talent of Yunnan University ; Cultivation Project for Excellent Youth of the National Natural Science Foundation of Yunnan University
Language英语
Funding ProjectNational Natural Science Foundation of China[41872095] ; National Natural Science Foundation of China[41430315] ; National Key R&D Program of China[2017YFC0602502] ; Knowledge Innovation Program of the Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences[Y570031QY1] ; Research Startup Project for Introduced Talent of Yunnan University[YJRC4201804] ; Cultivation Project for Excellent Youth of the National Natural Science Foundation of Yunnan University[2018YDJQ009]
WOS KeywordC-o-s ; Thermochemical Sulfate Reduction ; Freezing-point Depression ; Isotope Geochemistry ; Ore Genesis ; Lead Immobilization ; Sichuan Province ; Fluid Inclusion ; Yangtze Block ; Black Shales
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000486980200006
PublisherELSEVIER
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/6994
Collection深海科学研究部_深海地质与地球化学研究室
Corresponding AuthorZhou, Jia-Xi
Affiliation1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Queensland, Sch Earth & Environm Sci, Radiogen Isotope Facil & Stable Isotope Geochem L, Brisbane, Qld 4072, Australia
4.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Shaanxi, Peoples R China
5.Curtin Univ, Sch Earth & Planetary Sci, Inst Geosci Res, GPO Box U1987, Perth, WA 6845, Australia
6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
7.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Shandong, Peoples R China
Recommended Citation
GB/T 7714
Luo, Kai,Zhou, Jia-Xi,Huang, Zhi-Long,et al. New insights into the origin of early Cambrian carbonate-hosted Pb-Zn deposits in South China: A case study of the Maliping Pb-Zn deposit[J]. GONDWANA RESEARCH,2019,70(1):88-103.
APA Luo, Kai.,Zhou, Jia-Xi.,Huang, Zhi-Long.,Wang, Xuan-Ce.,Wilde, Simon A..,...&Tian, Liyan.(2019).New insights into the origin of early Cambrian carbonate-hosted Pb-Zn deposits in South China: A case study of the Maliping Pb-Zn deposit.GONDWANA RESEARCH,70(1),88-103.
MLA Luo, Kai,et al."New insights into the origin of early Cambrian carbonate-hosted Pb-Zn deposits in South China: A case study of the Maliping Pb-Zn deposit".GONDWANA RESEARCH 70.1(2019):88-103.
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