Geophysical characteristics and deep prospecting prediction of the Dachaigou gold deposit in the eastern Kunlun area
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摘要: 东昆仑成矿带是我国重要的金属矿成矿带, 分布有大量造山型金矿床, 其中较大规模的有昆仑河、沟里和五龙沟金矿集区。打柴沟是五龙沟金矿田近年来新发现的大型金矿床, 有较大的成矿潜力, 但是矿带向西延展情况不明, 为此开展了激电和广域电磁法测深工作。研究表明, 已知矿带位于区域重力异常梯级带、正负弱磁异常过渡区域, 在激电异常上位于激电异常边部或电性梯度带位置, 区域构造带发育区位于大面积激电异常区段; 区域构造带表现为大范围的低阻异常带, 已知矿带Ⅳ号蚀变带异常表现为低阻异常带开口位置, Ⅲ号蚀变带位于浅部电性异常梯度带。基于上述认识和西延段几条平行剖面的电磁法异常变化规律, 推断区域控矿构造向W-NWW向延伸稳定, 在矿区西延段形成有利的找矿空间。在打柴沟矿区开展的深部物探工作成果显示, 地球物理方法在深部地质找矿研究工作中具有明显优势, 为东昆仑金矿区深部找矿提供了成功经验。Abstract: The eastern Kunlun metallogenic belt, as a significant metal metallogenic belt in China, hosts extensive orogenic gold deposits and large-scale Kunlunhe, Gouli, and Wulonggou gold concentration areas. The Dachaigou gold deposit is a large-scale gold deposit newly discovered in the Wulonggou gold field in recent years. Despite its high metallogenic potential, the western extension of its ore belt has not been defined. Hence, this study conducted induced polarization (IP) sounding and wide-field electromagnetic sounding in the deposit. The results show that the known ore belt is situated in the regional gravity anomaly gradient zone, the transition zone of positive and negative weak magnetic anomalies, the edge of IP anomalies, or the electrical gradient zone. The development zone of the regional tectonic belt resides in the large-scale IP anomaly section. The regional tectonic belt is characterized by a wide range of low-resistivity anomaly zones. The IV and III alteration zones of the known ore belt are located in the opening position of the low-resistivity anomaly zone and the shallow electrical anomaly gradient zone, respectively. Based on the above understanding and the electromagnetic anomaly change patterns of several parallel profiles in the western extension segment, it was inferred that the regional ore-controlling structure extends steadily in the W-NWW direction, forming a favorable prospecting space in the western extension segment of the deposit. The results of deep geophysical exploration in the Dachaigou deposit indicate that geophysical methods manifest significant advantages in deep geological prospecting research, providing successful experience for deep prospecting in the eastern Kunlun gold deposit area.
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Key words:
- geophysics /
- gold deposit /
- deep prospecting /
- eastern Kunlun /
- Dachaigou
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