矿床地质2025，Vol.44Issue(2)：299-316,18.DOI:10.16111/j.0258-7106.2025.02.003
义兴寨金矿床斑岩成矿系统特征与矿体定位规律
Characteristics of porphyry metallogenic system and orebody localization regularities of Yixingzhai gold deposit
摘要
Abstract
In the Yixingzhai mining area,which contains the only super-large gold deposit in Shanxi Province,three pri-mary types of gold mineralization have been recognized,namely quartz-vein type,breccia-pipe type,and altered-porphyry type.Based on recent exploration results,from the metallogenic system perspective,this paper systemat-ically summarizes the geological characteristics of the three types of gold mineralization within the Yixingzhai gold deposit and analyzes the localization rules of the orebody.Further,we propose the prediction signature and target areas for prospecting.Residual volcanic capping layers mainly composed of welded tuff with magma frag-ments and rhyolitic lava were identified in the Nanmenshan area within the mining area,indicating that the mine area is shallowly denuded and the metallogenic system is well preserved.The three types of gold mineralization exhibit distinctive geological characteristics.The quartz-vein type gold orebodies are dominated by steeply dip-ping ore veins with a nearly north-south strike,the controlling mineralization elevation from the near-surface(～1450 m elevation)to～300 m.The Tietangdong gold orebody is a typical breccia-pipe type orebody,character-ized by the zonation of the upper skarnized breccia and the lower felsite porphyry-breccia.The Hewan altered-porphyry type gold orebody is large in scale(main orebody),characterized by the development of phyllic altera-tion and hematite alteration,with the orebody being divided from top to bottom into the breccia type mineraliza-tion zone,the altered-porphyry type mineralization zone(main body),and the irregular-vein type mineralization zone.The formation age of the porphyry and the mineralization age of the gold deposit are～140 Ma,forming a"trinity"metallogenic system of vein type,breccia-pipe type,and altered-porphyry type related to the Early Creta-ceous continental volcanic-intrusive complex.The felsite porphyry is the mineralized intrusion related to the gold mineralization.The combination of porphyry bodies and fracture systems control the localization of the gold orebody,and a metallogenic model for the metallogenic system is established.The three types of gold mineraliza-tion are mutually signatures for gold prospecting,especially the quartz-vein type gold mineralization distributed widely,exposed near the surface and yielded near the porphyry body,which is an important prediction signature for the(altered)porphyry type gold deposits.Based on the deposition patterns and the prediction signatures,the target areas for prospecting,such as the east of Tietangdong,are proposed.关键词
定位规律/成矿系统/找矿预测/义兴寨金矿床/山西省Key words
localization regularity/metallogenic system/prospecting prediction/Yixingzhai gold deposit/Shanxi Province分类
天文与地球科学引用本文复制引用
张会琼,王玉往,孙荣良,杨卫立,陈昱..义兴寨金矿床斑岩成矿系统特征与矿体定位规律[J].矿床地质,2025,44(2):299-316,18.基金项目
本文得到"紫金矿业集团矿山综合找矿预测专项-重要矿床类型成矿规律与找矿预测研究"(编号:4116-FW-2023-00035)资助 （编号:4116-FW-2023-00035）
