华南地质2026，Vol.42Issue(1)：45-64,20.DOI:10.3969/j.issn.2097-0013.2026.01.002
湘东北横江冲金矿床黄铁矿微量元素特征及其对成矿机制的指示
Characteristics of Trace Elements in Pyrite and Their Implications for the Ore-forming Mechanism in the Hengjiangchon Gold Deposit,Northeastern Hunan
摘要
Abstract
The Jiangnan Orogenic Belt is a significant gold-polymetallic metallogenic belt in South China,with total identified gold resources reaching nearly 1,000 tons.Northeastern Hunan region,situated in the central segment of this belt,hosts three major gold districts:Wangu,Huangjindong,and Liling,all of which record multiple episodes of gold mineralization.While previous studies have provided substantial insights into Indosinian and Yanshanian gold mineralization events in this region,research on Caledonian gold mineralization remains relatively limited,and the genesis of these gold deposits requires further clarification.The Hengjiangchong Gold Deposit,located in the Liling gold orefield,is a typical Caledonian gold deposit in the central Jiangnan Orogenic Belt.However,key aspects such as its trace element geochemical characteristics,evolution of ore-forming fluids,and gold enrichment mechanisms are still poorly understood,which constrains a comprehensive understanding of this mineralization processes.Based on detailed field geological investigations,this study divides the mineralization of the deposit into three stages:(I)Quartz-Pyrite-Arsenopyrite Stage,(II)Quartz-Pyrite-Polymetallic Sulfide-Native Gold Stage,and(III)Quartz-Calcite Stage.Within these seven generations of pyrite have been identified euhedral granular pyrite(Py1)from Stage I,exhibiting core(Py1a)-mantle(Py1b)-rim(Py1c)textures;Stage II includes anhedral patchy Py2a in altered wall rocks and porous Py2b,as well as pyrite in smoky-gray quartz veins with a porous core(Py3a)and a homogeneous rim(Py3b).Mineralogical and trace element geochemical analyses reveal that gold was primarily transported as gold-bisulfide complexes[Au(HS)2-]and eventually incorporated into pyrite as solid-solution gold(Au+).Integrated with previous research,we propose that dissolution-reprecipitation and wall rock sulfidation were the principal mechanisms controlling gold precipitation in this deposit.关键词
黄铁矿/微量元素/赋存状态/迁移与沉淀机制/横江冲金矿床/湘东北Key words
pyrite/trace elements/occurrence state/migration and precipitation mechanisms/Hengjiangchong gold deposit/Northeastern Hunan分类
天文与地球科学引用本文复制引用
胡立君,邵拥军,刘清泉,黄智民,李永顺,苏积恒..湘东北横江冲金矿床黄铁矿微量元素特征及其对成矿机制的指示[J].华南地质,2026,42(1):45-64,20.基金项目
国家自然科学基金项目(42272100)、湖南省科技创新计划项目(2021RC4055) （42272100）
