Geophysical characteristics and prospecting direction of gold deposits in Fengyang area
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摘要: 凤阳江山金矿是皖东地区规模最大的金矿床,近年来在其周边实施了多个勘查项目,但找矿效果不佳。通过开展重力扫面、重力剖面、音频大地电磁测深测量(audio magnetotelluric,AMT)等物探方法,总结区域重磁场特征,认为研究区存在隐伏构造岩浆岩带; 通过对比已知矿床的物探异常特征,认为AMT低阻异常带与含金层间破碎带具有良好的对应关系; 在总结分析成矿地质条件和成矿规律的基础上,认为鹿塘断裂是区内主要控矿构造; 通过重力反演,认为深部隐伏岩体顶界面埋深大部分约1 100 m; 基于“四步”式三维成矿定量预测方法体系,开展凤阳江山地区三维成矿预测研究,圈定了5个找矿靶区,为下步勘查工作提供依据。Abstract: Fengyang Jiangshan gold mine is the largest gold deposit in eastern Anhui Province. In recent years, multiple exploration projects have been implemented in its surrounding areas without any good prospecting results. Through the use of geophysical methods, such as gravity scanning, gravity magnetic profiling, and audio magnetotelluric depth sounding (AMT), the authors summarized the characteristics of regional gravity and magnetic fields and considered that there are hidden tectonic magmatic rocks in the study area. The AMT low resistance anomaly zone is believed to be corresponded well with the gold bearing interlayer fracture zone, after the analysis of the geophysical characteristics of known mineral deposits. Besides, Lutang fault is the main ore controlling structure in the area, on basis of the summary and analysis of the geological conditions and laws of mineralization. Through gravity inversion, it is believed that the top interface burial depth of hidden rock mass in the deep part is mostly around 1 100 m. The 3D mineralization prediction research in Jiangshan of Fengyang area was conducted by 3D mineralization quantitative prediction method system with 4 steps, and 5 prospecting target areas were identified, providing the basis for the exploration work in the future.
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