摘要
钴是重要的战略性关键金属,在现代工业和国防建设中有着广泛的应用。七宝山钴铅锌多金属矿床矿床位于钦杭成矿带中段,矿床中产出高品位钴矿石和大量钴独立矿物,具有鲜明的成矿特色,是我国最具代表性的热液型钴矿床。本次工作以七宝山钴铅锌多金属矿床为研究对象,借鉴地质冶金学研究思路,系统采集了矿床不同类型的矿石样品,通过全岩主微量元素、综合矿物分析系统(TIMA)、电子探针、矿物原位LA-ICP-MS微量元素和原位硫同位素等分析测试方法,定量分析了矿石中钴的赋存状态,并在此基础上探讨钴的来源和富集机制。研究结果表明七宝山矿床中不同类型矿石中钴含量差异极大,其中石英砂岩型钴矿石具有最高的钴含量(4.52%),浸染状铜钴矿石和团块状铜矿石钴含量较高(0.85%和0.56%),块状铅锌矿石中几乎不含钴(<0.1%)。钴的赋存状态定量计算结果表明,矿床中87.9%~95.3%的钴以独立矿物形式存在,主要为辉砷钴矿,其次为铁硫砷钴矿、斜方砷钴矿、方钴矿和硫铜钴矿等,少量钴以类质同象存在于黄铁矿、毒砂、黄铜矿和镍矿物中。硫同位素分析表明七宝山矿床成矿物质来源于富As-Co-Ni的岩浆热液。钴的富集沉淀可能受成矿流体温度、As/S比值和氧逸度等因素控制。
Cobalt is an important strategic critical metal with extensive applications in modern industry and national defense construction.The Qibaoshan cobalt-lead-zinc polymetallic deposit is located in the middle section of the Qin-Hang mineralization belt.The deposit yields high-grade cobalt ores and a large number of cobalt-bearing minerals,demonstrating distinct mineralization characteristics.It is one of the most representative hydrothermal-type cobalt deposits in China.This study focuses on the Qibaoshan cobalt-lead-zinc polymetallic deposit,employing a geological metallurgy approach.Systematic samples from different types of ores were collected from the deposit.Through major and trace element analysis of whole rocks,Tescan Integrated Mineral Analyzer(TIMA),electron probe analysis,in-situ LA-ICP-MS trace element testing,and in-situ sulfur isotope analysis,the occurrence state of cobalt in the ores was quantitatively analyzed.Based on these results,the origin and enrichment mechanisms of cobalt were further discussed.The research findings show that the cobalt content in different types of ores from the Qibaoshan deposit varies greatly.Among them,the quartz sandstone-type cobalt ore has the highest cobalt content(4.52%),followed by the impregnated copper-cobalt ore and the massive copper ore(0.85% and 0.56%,respectively).Cobalt content in massive lead-zinc ores is almost negligible(<0.1%).Quantitative calculations of cobalt occurrence state indicate that 87.9% to 95.3% of cobalt exists as independent minerals in the deposit,mainly as cobaltite,followed by Glaueodot,safflorite,skutterudite,and carrollite.A small amount of cobalt exists as solid solution in pyrite,arsenopyrite,chalcopyrite,and nickel minerals.Sulfur isotope analysis indicates that the metallogenic materials of the Qibaoshan deposit originate from As-Co-Ni-rich magmatic hydrothermal fluids.The enrichment and precipitation of cobalt may be controlled by factors such as the temperature of the metallogenic fluid,the As/S ratio,and the oxygen fugacity.
作者
刘冠宇
范裕
李政
熊燕云
周涛发
孔若颜
王会敏
晏鸿
LIU GuanYu;FAN Yu;LI Zheng;XIONG YanYun;ZHOU TaoFa;KONG RuoYan;WANG HuiMin;YAN Hong(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Provincial Key Laboratory for Deep Exploration,Evaluation and Utilization of Strategic Mineral Resources,Hefei 230009,China;Jiangxi Province Key Laboratory of Exploration and Development of Critical Mineral Resources,Jiangxi Geological Survey and Exploration Institute,Nanchang 330009,China;Jiangxi Copper Group Qibaoshan Mining Co.,LTD.,Yichun 336000,China)
出处
《岩石学报》
北大核心
2025年第8期2631-2647,共17页
Acta Petrologica Sinica
基金
国家自然科学基金项目(42430811、92462305)
重点研发计划项目(2022YFC2903503)
关键矿产资源勘查与开发江西省重点实验室开放课题(GJKC2024KF01)
中国地质调查局地质调查项目(DD202402027)联合资助.
关键词
钴
赋存状态
富集规律
热液型富钴矿床
钦杭成矿带
Cobalt
Occurrence states
Enrichment regulation
Hydrothermal cobalt-rich deposits
Qin-Hang metallogenic belt
作者简介
第一作者:刘冠宇,男,2000年生,博士生,地质学专业,E-mail:766495077@qq.com;通讯作者:范裕,男,1982年生,教授,博士生导师,矿物学、岩石学、矿床学专业,E-mail:fanyu@hfut.edu.cn。
