地质与勘探2025，Vol.61Issue(5)：926-937,12.DOI:10.12134/j.dzykt.2025.05.004
胶东上庄金矿物化探异常特征与找矿方向
Characteristics of Geophysical and Geochemical Anomalies and Prospecting Direction of the Shangzhuang Gold Deposit in Jiaodong Peninsula
摘要
Abstract
Metamorphic core complexes represent one of the key geological factors controlling the spatial distribution of gold deposits in the Jiaodong Peninsula.Previous studies on gold mineralization in Jiaodong have predominantly focused on the relationship between intrusive rocks and mineralization,while paying less attention to the metamorphism associated with these intrusions.In particular,there has been a lack of systematic tracing of the metamorphic-hydrothermal origin of the ore-forming fluids,which has constrained the accurate targeting of exploration directions.This study takes the Shangzhuang gold deposit in Jiaodong as a case study.Through systematic petrographic observations,integrated with analysis of geophysical and geochemical anomalies and elemental geochemistry,we aim to clarify the metamorphic conditions and identify the source of metamorphic fluids.Petrographic results indicate that the granodiorite in the Shangzhuang deposit underwent high greenschist-facies metamorphism overprinted by low greenschist facies metamorphism.It is suggestive of possible transition to higher-grade metamorphic zones at depth and reflects a process of exhumation and uplift of the metamorphic complex.Furthermore,the replacement of metamorphic quartz by fine-grained sericite and quartz indicates that mineralization occurred after the latest metamorphic event.The simple mineral assemblage of pyrite-sericite-quartz rock(ore),with significantly higher sericite content compared to the wall rock,further supports the metamorphic-hydrothermal nature of the ore-forming fluids.Integrated geophysical and geochemical analyses reveal a strong correlation between apparent resistivity anomalies and mineralization.A high-resistivity anomaly in the southeastern deep part of the deposit suggests the presence of a hidden intrusive body,i.e.,a concealed segment of the metamorphic core complex.Significant differences in the concentration of primary halo elements such as Au,Bi,and Mn between the hanging wall and footwall of the Jiaojia fault indicate that the ore-forming fluids were mainly derived from the footwall(southeastern block).In the vertical direction,the unclosed anomalies of ore-forming elements such as Au,Bi,Ag,and Cu suggest that the mineralization extends downward,though further deep exploration should be conducted cautiously.Comprehensive research indicates that the area with concealed intrusive rocks in the southeastern part of the Shangzhuang gold deposit is a key target for future exploration,with high potential for discovering new ore bodies.关键词
变质核杂岩/变质热液/高绿片岩相/高阻异常/原生晕/找矿方向/上庄金矿/胶东地区Key words
metamorphic core complex/metamorphic fluid/high greenschist facies/high resistivity anomaly/primary halo/exploration direction/Shangzhuang gold deposit/Jiaodong Peninsula分类
天文与地球科学引用本文复制引用
孙靖,周辉,王志浩,方立东,贾静,张启连,韦访..胶东上庄金矿物化探异常特征与找矿方向[J].地质与勘探,2025,61(5):926-937,12.基金项目
广西教育科学规划专项课题(编号:2023ZJY1454)资助. （编号:2023ZJY1454）
