地质学报(英文版)2024，Vol.98Issue(2) ：416-429.DOI:10.1111/1755-6724.15126

Sedimentary Environment and Mineralization of the Black Shale Polymetallic Layer in the Early Cambrian,SW China:Constraints from in situ LA-ICP-MS Analysis of Pyrite

YANG Zhen FU Yong LI Chao CAI Xi GUO Chuan
地质学报(英文版)2024，Vol.98Issue(2) ：416-429.DOI:10.1111/1755-6724.15126
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Sedimentary Environment and Mineralization of the Black Shale Polymetallic Layer in the Early Cambrian,SW China:Constraints from in situ LA-ICP-MS Analysis of Pyrite

YANG Zhen 1FU Yong 2LI Chao 3CAI Xi 1GUO Chuan2
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作者信息

  • 1. College of Eco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China
  • 2. College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Georesources and the Environment,Ministry of Education,Guizhou University,Guiyang 500025,China
  • 3. National Research Center for Geoanalysis,Chinese Academy of Geological Sciences,Beijing 100037,China
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Abstract

A polymetallic layer is usually developed at the bottom of the early Cambrian black shale in Guizhou Province.The mineral that makes up the polymetallic layer is related to the sedimentary facies.To analyze the differentiation mechanism between polymetallic deposits(Ni-Mo and V),the Zhijin Gezhongwu profile located in the outer shelf and the Sansui Haishan V deposit located in the lower slope are selected to study the in situ sulfur isotopes and trace elements of pyrite.The results show that δ34S values of pyrite vary widely from-7.8 ‰ to 28 ‰ in the Gezhongwu profile,while the δ34S values are relatively uniform(from 27.8 ‰ to 38.4 ‰)in the Haishan profile.The isotopic S composition is consistent with the transition that occurs in the sedimentary phase from the shelf to the deep sea on the transgressive Yangtze platform;this indicates that the δ34SO42-values in seawater must be differently distributed in depositional environments.The sulfur in the Ni-Mo layer is produced after the mixing of seawater and hydrothermal fluid,while the V layer mainly originates from seawater.Overall,the Ni-Mo and V deposits have been differentiated primarily on the basis of the combined effect of continental weathering and hydrothermal fluid.

Key words

sedimentary environment/black shale/polymetallic layer/pyrite/early Cambrian

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基金项目

National Natural Science Foundation of China(42272103)

National Natural Science Foundation of China(92062221)

National Natural Science Foundation of China(42063009)

National Natural Science Foundation of China(U1812402)

Guizhou Provincial Science and Technology Projects(Qiankehejichu-ZK[2022]common 213)

Higher Education Scientific Research Projects of the Education Department of Guizhou Province(Qianjiaoji[2022]157)

出版年

2024
地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
参考文献量62
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