矿床地质2024，Vol.43Issue(4)：935-950,16.DOI:10.16111/j.0258-7106.2024.04.012
沉积黄铁矿微量元素和硫同位素组成对黄金洞金矿床的成因约束
Trace elements and sulfur isotopic composition of sedimentary pyrite on con-straining ore genesis of Huangjindong gold deposit
摘要
Abstract
The Huangjindong gold large-scale deposit is located in the northeastern Hunan ore cluster,Jiangnan orogen-ic belt,and the ore bodies mainly occur in the slate of the Neoproterozoic Lengjiaxi Group,and auriferous quartz vein is the main ore type. In order to further restrict the sources of gold and sulfur in the ore-forming system,re-veal the role of wallrock to the mineralizing system,and finally make a better understanding of the genesis This paper focuses on the sedimentary pyrite from slate of the Lengjiaxi Group,systematic analyses including petrog-raphy,microstructure using electron probe,laser in situ trace elements and sulfur isotope were conducted. The re-sults show that sedimentary pyrite occurs as assemblages and the individuals is mostly of hundreds to thousands of μm in size. LA-ICP-MS trace element analytical results show that w(As) concentrations vary from 796×10-6 to 10 667×10-6,and invisible w(Au) is mostly less than 1.0×10-6. In situ S isotope analytical results reveal that δ34S value of sedimentary pyrite mainly ranges from-10.7‰ to-4.7‰,which is similar to the hydrothermal pyrite in the ore (δ34S=-14.2‰ to-0.5‰). All results suggest that the majority of Au is sourced from wallrock,indicating Au is mainly associated with deep processes. During the fluid-rock interaction processes,sedimentary sulfur add-ed to the mineralization system,which gives implications for the interpretation of S isotope composition of hydro-thermal pyrite in Huangj indong deposit.关键词
沉积黄铁矿/原位和微量元素S同位素/黄金洞/湘东北矿集区/江南造山带Key words
sedimentary pyrite/In-situ trace elements and S isotope/Huangjindong/northeastern Hunan ore cluster/Jiangnan orogenic belt分类
天文与地球科学引用本文复制引用
孟亚群,李伟,毛景文,吴圣刚,陈孝刚,阴芳圆..沉积黄铁矿微量元素和硫同位素组成对黄金洞金矿床的成因约束[J].矿床地质,2024,43(4):935-950,16.基金项目
本文得到国家自然科学基金项目(编号:42272073、42003039)资助 （编号:42272073、42003039）
