综合物探在栖霞金山金矿深边部找矿预测中的应用
Application of Integrated Geophysical Exploration Techniques in Deep and Edge Prospecting and Prediction of the Jinshan Gold Deposit in Qixia
金山金矿区位于胶东地区栖霞—蓬莱成矿带中南部,属于中小型蚀变岩型金矿床。随着地表找矿工作进入瓶颈期,开展深边部找矿的迫切性日益凸显。为开辟第二找矿空间,实现深边部找矿突破,在金山金矿区东部开展高精度磁测和CSAMT测量工作。根据测量结果,确定了磁异常极小值跳变、反演电阻率低阻异常带是指示控矿构造小庄—大庄头韧性剪切带的地球物理标志。通过钻探结果验证了高精度磁测和CSAMT测量反演解译结果的可靠性,在推断的2处成矿有利区共发现隐伏金矿体一层,金矿化体5层。综合分析认为:金山金矿区东部具有较大的找矿潜力,值得进一步开展深边部找矿工作;高精度磁法测量与CSAMT相结合的综合物探方法是开展深边部找矿工作的有效手段,具有良好的应用前景。
The Jinshan gold mining area is located in the central-southern segment of the Qixia-Penglai metallogenic belt within the Jiaodong region and is characterized as a medium-sized altered rock-type gold deposit. As surface prospecting efforts have reached a bottleneck, there is an increasing urgency to pursue deep-side prospecting to identify additional resources. To expand the prospecting domain and achieve breakthroughs in deep and edge exploration, geophysical techniques such as high-precision surface magnetic surveys and controlled source audio magnetotelluric (CSAMT) soundings are employed to assess and evaluate gold resources in the eastern part of the Jinshan mining area. By processing inversion data from high-precision ground magnetic surveys and CSAMT soundings, and integrating these with previous geological research, a comprehensive geological interpretation was performed on the magnetic anomaly correlation imaging inversion results and the CSAMT inversion outcomes. This study elucidated the magnetic properties, geoelectrical characteristics, and spatial distribution of deep geological formations and fault structures in the eastern segment of the Jinshan gold mining area. It also delineated the development location, extension, and variations in the deep attitude of the regional ore-controlling structure, specifically the Xiaozhuang-Dazhuangtou ductile shear zone, within the eastern Jinshan gold mining area. Furthermore, the research identified that the minimum magnetic anomaly jump points, low-value anomaly zones in magnetic anomaly correlation imaging coefficients, and low-resistivity anomaly zones in apparent resistivity serve as geophysical indicators of the Xiaozhuang-Dazhuangtou ductile shear zone. Based on these insights, potential areas for mineralization were inferred. Subsequent drilling operations led to the discovery of one concealed gold ore body and five gold mineralization bodies within the two inferred favorable mineralization areas, thereby validating the reliability of the inversion interpretation results derived from the high-precision magnetic survey and controlled source audio magnetotelluric sounding. A comprehensive analysis indicates that the integration of high-precision magnetic surveys with CSAMT surveys enables precise detection of the spatial distribution and extension of deep geological formations and fault structures in the eastern sector of the Jinshan gold mining area. The ore-controlling structure, identified as the Xiaozhuang-Dazhuangtou ductile shear zone, is characterized by geophysical signatures of“low magnetism and low resistivity.” In the eastern region of the Jinshan mining area, this shear zone exhibits an approximately east-west orientation, with its dip angle decreasing progressively from nearly vertical to 45°~60° southward. Drilling validation results suggest that the eastern section of the Jinshan gold mining area possesses substantial prospecting potential, justifying further exploration in both deep and peripheral zones. The integrated geophysical methodology, combining high-precision magnetic surveys with CSAMT surveys, is demonstrated to be an effective strategy for deep and peripheral prospecting, highlighting its promising application potential.
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中国地质调查局项目“山东栖霞台前—西陡崖金矿资源调查评价项目”(DD20242294)
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