The Discovery and Prospecting Significance of the Qianhongquan Gold Deposit in the South Beishan Orogenic Belt, Gansu Province, China
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摘要:
甘肃北山南带是中国西北地区重要的金属矿床富集区，已发现多处韧性剪切带型金矿床或与韧性剪切带有关的金矿床，但近年来该区有关韧性剪切带型金矿的研究和找矿勘查工作陷入沉寂。前红泉金矿是在基础地质调查工作的基础上通过大比例尺化探手段逐步发现的中型金矿床。通过野外勘查和室内综合研究发现，该金矿床产于长城纪古硐井群千糜岩、千枚岩和千枚状板岩中，严格受NWW向韧性剪切带控制，硅化、毒砂化、绢云母化、黄铁矿化是与之关系密切的矿化蚀变。区内金化探异常高值区及相关矿化蚀变可作为该矿床主要的找矿标志。前红泉金矿的发现对北山南带寻找与韧性剪切带有关的金矿具有重要的指导意义，尤其是在勘查方法手段选择、找矿思路及方向上具有一定的借鉴价值。文章提出已有矿床外围、深部及重要化探异常区是下一步找矿突破的重点区域。
Abstract:The southern belt of Beishan orogenic in Gansu is an important metallogenic concentration area in the northwest region of China, where numerous gold deposits of ductile shear zone−type or associated with such zones have been discovered. Nevertheless, research and prospecting activities focusing on ductile shear zone-type gold deposits in this region have undergone a period of relative dormancy in recent years. The Qianhongquan Gold Deposit is a medium−sized gold deposit that has been gradually discovered through large−scale exploration based on basic geological survey work. Through field exploration and indoor comprehensive research, it was found that the gold deposit is located in the mylonite, gneiss and phyllonite of the Gudongjing group, strictly controlled by the NWW ductile shear zone. Silicification, arsenopyritization, sericite alteration, and pyrite mineralization are closely related to mineralization alteration. The areas with abnormal high values of gold geochemical anomalies, and related mineralization alterations can serve as the main prospecting indicators for this deposit. The discovery of The Qianhongquan Gold Deposit has important guiding significance for searching for gold deposits associated with the ductile shear zone in the southern belt of Beishan orogenic, especially in terms of the selection of exploration methods, prospecting ideas and direction. The article proposes that the peripheral and deep parts of the existing deposits and important geochemical anomaly areas are the key areas for the next prospecting breakthrough.
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Key words:
- Qianhongquan /
- ductile shear zone /
- gold deposit /
- prospecting significance /
- Beishan region
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