地质通报2023，Vol.42Issue(11)：1793-1807,15.DOI:10.12097/j.issn.1671-2552.2023.11.001
广西金秀寒武系黑色岩系中的热液脉状镍钴矿床超常富集规律与成矿条件
The supernormal enrichment regularity and metallogenic conditions of hydrothermal vein-type nickel-cobalt ore deposit in the Cambrian black rock series of Jinxiu,Guangxi,South China
摘要
Abstract
A hydrothermal vein-type nickel-cobalt deposit was discovered in the Cambrian black rock series in Jinxiu,Guangxi,South China.The deposit is exceptionally rare and holds significant scientific and prospecting importance.This paper introduces the geological characteristics of the Longhua deposit,the rules governing ore enrichment,as well as mineralogical and geochemical investigations.The ore-bearing rock is carbonaceous mudstone in the lower part of the Cambrian Qingxi Formation,and the ore-bodies can be classified into two types:high-grade hydrothermal veins and low-grade disseminated types.Two main mineral assemblages are identified:Ni-Co-As and Ni-Co-S,occurring within the primary vein.Their distribution aligns with NWW and NNW trending faults,respectively.The primary ore minerals consist of Ni-Co arsenide,accompanied by a minor presence of sulfide,quartz and carbonate.Elemental contents of niccolite,gersdorffite,polydymite,millerite,skutterudite,bismuthite,and native bismuth minerals were analyzed using the electron probe method.Additionally,the Fe-Co-Ni ternary diagram of the primary ore minerals was examined.Based on the internal structure and paragenetic relationships of minerals,the sequence of mineral formation is elucidated,and the formation process of ore minerals can be divided into endogenic hydrothermal stage and epigenetic stage.The results of elemental mapping analysis reveal significant zonation characteristics in Ni,Co,and S elements within niccolite,possibly indicating secondary growth as the underlying cause.The hydrothermal vein-type nickel-cobalt deposit may be the product of the old crustal material recirculation before Caledonian Movement.The relationship between granites and mineralization is still difficult to judge.The supernormal enrichment of nickel-cobalt elements may mainly come from the late tectonic-fluid reformation.关键词
黑色岩系/Ni-Co超常富集/热液脉状矿床/改造成矿/广西Key words
black rock series/Ni-Co supernormal enrichment/hydrothermal vein-type ore deposit/metallogenic condition/Guangxi分类
天文与地球科学引用本文复制引用
张宝林,王学海,苏艳平,沈晓丽..广西金秀寒武系黑色岩系中的热液脉状镍钴矿床超常富集规律与成矿条件[J].地质通报,2023,42(11):1793-1807,15.基金项目
科技部国家重点研发计划项目专题《热液型矿床钴成矿作用与找矿勘查》(编号2022YFC2903503)、中国科学院地质与地球物理研究所自主创新项目《隐伏矿床定位预测理论与方法研究》(编号:31351460)、山东省自然科学基金项目《下寒武统黑色页岩中Ni-Co多金属矿床沉淀-富集机制研究》(编号:ZR2020QD030)、云南伟力达地球物理勘测有限公司科研项目《隐伏矿床预测与探查的新理论新技术应用研究》(编号:51650930)、四川恒康矿业有限公司科研项目《目标矿区调查与评价研究》(编号:51741170) （编号2022YFC2903503）
