摘要
铁矿石中硫化物对选冶工艺具有显著影响,为了查明袁家村—狐姑山BIF铁矿床中硫的赋存状态、空间分布规律、源区及成因机制,对袁家村—狐姑山铁矿床中硫化物开展了野外地质调查、显微鉴定、矿物自动分析(MLA)与硫同位素分析。实验结果表明:(1)袁家村铁矿石中硫化物主要形成于沉积期、变质期、辉绿岩期与热液期,而狐姑山铁矿床中硫化物主要形成于沉积期、变质期与热液期;(2)袁家村—狐姑山铁矿床矿石中硫主要赋存于黄铁矿,次为黄铜矿、磁黄铁矿,另有少量的毒砂及硫酸盐类矿物;(3)各期次黄铁矿δ34 S均在零值附近,表明其主要来源于岩浆,沉积期部分可能混合了海水硫,显示混合来源的特征。综合分析认为袁家村—狐姑山铁矿床中硫化物的形成可能主要与海底火山热液活动相关,并受后期多期次岩浆热液叠加发生富集,可能与区域变质作用以及矿区广泛分布的岩浆活动有关。
Sulfide in iron ore has significant impact on the beneficiation and smelting process.In order to determine the occurrence state,spatial distribution,source and genetic mechanism of sulfur in the Yuanjiacun-Hugushan deposit,field geological survey,microscopic identification,automatic mineral analysis(MLA)and sulfur isotope analysis were performed.The experimental results show that:(1)The sulfides in Yuanjiacun iron ore can be divided into four phases:sedimentation period,metamorphic period,diabase period and hydrothermal period,while the sulfides in Hugushan iron ore are mainly formed in sedimentation period,metamorphic period and hydrothermal period;(2)Sulfur in Yuanjiacun-Hugushan iron ore mainly occurs in pyrite,followed by chalcopyrite,magnetite,and a small amount of arsenopyrite and sulfate minerals;(3)Theδ34 S of each stage is near zero,indicating that it is mainly derived from source magma and sedimentation period may mixed seawater,indicating the mixed sources.Comprehensive analysis shows that the formation of sulfide in iron ore may be mainly related to submarine volcanic hydrothermal activity.The sulfide spatial distribution is mainly controlled by submarine volcanic hydrothermal activity,and enriched by multi-stage magmatic hydrothermal superposition,which may be related to regional metamorphism and widespread magmatic activity in the mining area.
作者
蒋亚松
邓敏
刘飚
刘玉国
蒋江波
杨学习
JIANG Yasong;DENG Min;LIU Biao;LIU Yuguo;JIANG Jiangbo;YANG Xuexi(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South University,Changsha 410083,Hunan,China;Changsha Research Institute of Mining and Metallurgy Co.LTD.,Changsha 410083,Hunan,China)
出处
《矿产勘查》
2023年第3期416-431,共16页
Mineral Exploration
基金
山西省自然资源厅科技项目(0632-1911FW1L2054)资助。
