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黔东南三穗下寒武统黑色岩系中钒富集机制研究
投稿时间:2021-04-15  修订日期:2021-07-09  点此下载全文
引用本文:薛忠喜,高军波,杨瑞东,徐海,陈军,高磊.2021.黔东南三穗下寒武统黑色岩系中钒富集机制研究[J].地质论评,67(5):1321-1331,[DOI]:.
XUE Zhongxi,GAO Junbo,YANG Ruidong,XU Hai,CHEN Jun,GAO Lei.2021.Enrichment mechanism of vanadium in Lower Cambrian black rock series in Sansui,southeastern Guizhou[J].Geological Review,67(5):1321-1331.
DOI:10.16509/j.georeview.2021.08.041
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作者单位E-mail
薛忠喜 1)贵州大学资源与环境工程学院贵阳5500252)贵州大学喀斯特地质资源与环境教育部重点实验室贵阳550025 luopuxue1996@163.com 
高军波 1)贵州大学资源与环境工程学院贵阳5500252)贵州大学喀斯特地质资源与环境教育部重点实验室贵阳550025 gaojunbo1985@126.com 
杨瑞东 1)贵州大学资源与环境工程学院贵阳5500252)贵州大学喀斯特地质资源与环境教育部重点实验室贵阳550025  
徐海 1)贵州大学资源与环境工程学院贵阳5500252)贵州大学喀斯特地质资源与环境教育部重点实验室贵阳550025  
陈军 1)贵州大学资源与环境工程学院贵阳5500252)贵州大学喀斯特地质资源与环境教育部重点实验室贵阳550025  
高磊 1)贵州大学资源与环境工程学院贵阳5500252)贵州大学喀斯特地质资源与环境教育部重点实验室贵阳550025  
基金项目:本文为贵州省沉积矿床科技创新人才团队项目(编号:黔科合平台人才\[2018\]5613)、国家自然科学基金资助项目 (编号:U1812402)和贵州省人才基地项目(编号:RCJD2018-21)的成果
中文摘要:扬子板块南缘下寒武统黑色页岩地层中分布有一套富含Ni、Mo、V、U、Ba、PGE等的多金属层,并在贵州多地形成Ni—Mo—V—Ba矿床。黔东南三穗钒矿是扬子板块南缘黑色页岩型多金属矿床的重要组成部分,矿体主要赋存于早寒武世九门冲组底部黑色炭质、硅质泥岩中。针对三穗钒矿含矿岩系,通过沉积学和元素地球化学研究,结果表明,赋矿硅质岩、含钒炭质泥岩中存在热水物质贡献的明显信号,指示热水端元输入很可能是钒的重要来源。环境敏感元素及相关参数分析显示,局限盆地内的缺氧水体环境更有利于钒的富集。此外,有机质与钒富集之间具有明显的耦合关系,说明有机质的吸附对钒的沉淀和富集起到重要控制作用。
中文关键词:下寒武统  钒矿床  沉积环境  矿床成因  黔东南
 
Enrichment mechanism of vanadium in Lower Cambrian black rock series in Sansui,southeastern Guizhou
NameInstitution
XUE Zhongxi1)College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;2)Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,550025
GAO Junbo1)College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;2)Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,550025
YANG Ruidong1)College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;2)Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,550025
XU Hai1)College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;2)Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,550025
CHEN Jun1)College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;2)Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,550025
GAO Lei1)College of Resource and Environment Engineering,Guizhou University,Guiyang,550025;2)Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang,550025
Abstract:This paper takes the Sansui Yacha section in Southeastern Guizhou,which is located in the transitional slope area of the Yangtze Block during the Ediacaran(Sinian) Period—Cambrian Period transitional time as the research object,explores the source of ore-forming materials,reveals the redox conditions of ancient sea water during the deposition of the vanadium deposits,and explains the internal relationship between vanadium enrichment and environmental conditions,organic matter.The purpose is to provide a scientific basis for a further understanding of the genesis and metallogenic regularity of the Early Cambrian polymetallic layer in South China.Methods:Field investigation and systematic sampling were carried out in this paper.The samples were tested for major,trace and organic carbon and further through the study of sedimentology and element geochemistry.Results: ① From the bottom to the top of the Sansui Yacha section,TOC is gradually increasing.Compared with the Liuchapo Formation,the TOC content of the Jiumenchong Formation is higher,especially in the vanadium rich layer,which can reach 14.80%.② The enrichment of Mo,U and V in the Liuchapo Formation increased gradually,but decreased significantly in the volcanic ash layer.In Jiumenchong Formation,there is an obvious increase at the barium enrichment layer,and then it decreases gradually.On the other hand,Th/U value shows the opposite trend.Mo/TOC values are less than 15 except for those near the volcanic ash layer.The U/Th ratio increased gradually in the Liuchapo Formation and decreased significantly in the volcanic ash layer but in the vanadium and barium enriched layer of Jiumenchong Formation is high again.Y/Ho was 27.26~49.25,with an average of 35.89.Conclusions: ① The ore bearing rock series of the Sansui vanadium deposit is mainly composed of black carbonaceous and siliceous mudstone.The ore bearing strata are mainly the Lower Cambrian Jiumenchong Formation, followed by the Liuchapo Formation.② The ore-forming materials of the Sansui vanadium deposit have the characteristics of multiple sources. The deep material circulation induced by hydrothermal system and the input of terrigenous material caused by strong continental weathering are likely to be the important material basis of vanadium enrichment.③ The anoxic environment developed in the limited basin creates favorable conditions for vanadium enrichment and mineralization,and the adsorption of organic matter is an important way to cause vanadium precipitation and mineralization.
keywords:Lower Cambrian  vanadium deposit  sedimentary environment  genesis of deposit  southeastern Guizhou
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