湘东北长沙—平江断裂带关键金属钴的赋存状态与成矿规律  

Occurrence State and Ore-forming Regularity of Critical Metal Cobalt in the Changsha-Pingjiang Fault Zone,Northeastern Hunan Province

作　　者：王智琳 伍杨 许德如 邹少浩 董国军[3] 彭尔柯 宁钧陶[3] 康博[3] WANG Zhilin;WU Yang;XU Deru;ZOU Shaohao;DONG Guojun;PENG Erke;NING Juntao;KANG Bo(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,School of Geosciences and Info-Physics,Central South University,Changsha 410083,Hunan,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China;Team 402,Hunan Geology and Mineral Resources Exploration and Development Bureau,Changsha 410004,Hunan,China)

机构地区：[1]中南大学地球科学与信息物理学院,有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [2]东华理工大学省部共建核资源与环境国家重点实验室,江西南昌330013 [3]湖南省地质矿产勘查开发局402队,湖南长沙410004

出　　处：《黄金科学技术》2020年第6期779-785,共7页Gold Science and Technology

基　　金：国家重点研发计划项目“深地资源勘查开采”重点专项“中国东部中生代构造格局与演化”(编号:2016YFC0600401);国家自然科学基金项目“湘东北地区钴铜多金属成矿作用研究”(编号:41672077)和“海南石碌铁多金属矿床中钴铜矿成矿物质来源及年代学研究”(编号:41302049)联合资助。

摘　　要：近年来,我国在湘东北长沙—平江断裂带东侧的井冲—北山一带的钴资源找矿勘查取得了较大进展,相继发现了井冲铜钴多金属矿床(中型)、横洞钴铜矿床(中型)和大岩金钴矿化点等热液脉型钴独立/共生矿床(点)。通过系统分析长沙—平江断裂带钴的成矿特征和控矿因素,在识别不同成矿阶段的基础上,总结了钴的主要产出形式和赋存状态。结果表明:与毒砂共生的细粒黄铁矿中钴含量高达13.48%,明显高于其他类型的黄铁矿中的钴含量(最高仅为1.06%),据此提出细粒黄铁矿+毒砂矿物组合可作为长沙—平江钴矿带寻找高品位钴矿的直接矿物标志。结合含钴矿物的类型、分布与丰度,提出了初步的选冶建议。Recently,the exploration of cobalt resources in the Jingchong-Beishan area,the east of Changsha-Pingjiang fault zone,northeastern Hunan Province,has made great advances.Some Co(-polymetallic)vein deposits including the medium-size Jingchong Cu-Co polymetallic deposit and Hengdong Co-Cu deposit,and Dayan Au-Co occurrence were discovered in this region.Based on the detailed field observation,this study identified the ore stages,and concluded the metallogenic characteristics of Changsha-Pingjiang cobalt ore belt as well as the ore-forming factors.The combined microscopic observation and in-situ analytical methods revealed that the metal Co was mainly incorporated in fine-grained pyrite and arsenopyrite as stoichiometric substitution,with subordinate occurrence as independent mineral cobaltite.The complicated texture and chemical compositions of Co-beating pyrite and arsenopyrite indicated that pyrite associated with arsenopyrite has the higher Co concentration(up to 13.48%),greater than that in arsenopyrite-exclusive assemblages.Therefore,the mineral assemblage of fine-grained pyrite and arsenopyrite can be used as the mineral fingerprint to trace the high-grade Co ores during the prospecting exploration.Subsequently,the preliminary mineral processing technology was proposed.

关 键 词：关键金属钴 黄铁矿 毒砂 辉砷钴矿 长沙—平江断裂带 赋存状态 湘东北 

分 类 号：P618.51[天文地球—矿床学]