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东昆仑成矿带德福胜沟中游金矿床地质特征、 找矿潜力及找矿效果

Geological characteristics, prospecting potential, and prospecting effectiveness of Defushenggou middle reaches gold deposit in East Kunlun Metallogenic Belt

  • 摘要:

    德福胜沟中游金矿床位于东昆仑成矿带,为阐明矿床地质特征、确定找矿潜力,采用地 质草测、水系沉积物测量、激电剖面测量等手段相结合的综合找矿方法,对矿床地质特征、地球化 学特征、地球物理特征进行综合分析,总结找矿潜力,并通过布置探矿工程进行验证。德福胜沟中 游金矿床矿体产于矽卡岩中,受近东西向断裂控制,中三叠世二长花岗岩、花岗闪长岩为成矿提供 了热源及物质来源,金水口岩群为主要赋矿地层,为成矿提供了部分物质来源。矿区内已圈出蚀 变带3条、矿体3条、矿化体10条。其中,银矿体1条、铜矿体1条、金银多金属矿体1条,铜矿化体6条、 铅矿化体1 条、金银矿化体2 条、金矿化体1 条。水系沉积物测量共圈定了15 处综合异常 (GA1~GA15),且综合异常GA3、GA10、GA11、GA14、GA15具有较好的找矿潜力。激电剖面测量圈 定了3条中阻中极化异常(Ⅰ、Ⅱ、Ⅲ),且Ⅱ号激电异常与Ps1、Ps20构造破碎带相吻合,为矿致异 常,具有极好的找矿潜力。通过找矿潜力分析,以布置探槽及钻探等工作手段对具有找矿潜力的 地段进行深部矿(化)体延伸的验证,并对成矿地质特征进行研究,取得了找矿突破,发现了4条金 矿化体,分别为Kh7、Kh8、Kh14、Kh16金矿化体。该研究成果可为区域内同类型矿床的基础地质 研究及找矿突破提供重要借鉴。

     

    Abstract:

    Defushenggou middle reaches gold deposit are situated within the East Kunlun Metallogenic Belt. To clarify the geological characteristics of the deposits and ascertain their prospecting potential, a comprehensive prospecting approach was adopted. This approach combined various methods, including geological reconnaissance surveys, stream sediment surveys, and induced polarization(IP)profile surveys. Through this integrated approach, a comprehensive analysis was conducted on the deposit’s geological, geochemical, and geophysical characteristics, followed by a summary of prospecting potential and a validation through the deployment of exploration projects. The ore bodies of Defushenggou middle reaches gold deposit are hosted within skarn and are controlled by near east west‐trending faults. The monzogranite and granodiorite of the Middle Triassic have provided the heat source and material source necessary for mineralization.The Jinshuikou Rock Group servesasthe primary ore‐hosting stratum,contributing partially to the material source for mineralization. Within the mining district, 3 alteration zones, 3 ore bodies, and 10 mineralized bodies have been delineated. Specifically, there is 1 silver ore body, 1 copper ore body,1 gold-silver polymetallic ore body, 6 copper mineralized bodies, 1 lead mineralized bodies, 2 gold-silver mineralized bodies, and 1 gold mineralized body. The stream sediment survey identified a total of 15 comprehensive anomalies(GA1-GA15). Among them, comprehensive anomalies GA3, GA10, GA11, GA14, and GA15 demonstrated significant prospecting potential. The IP profile survey delineated 3 medium‐resistance and medium‐polarization anomalies(Ⅰ, Ⅱ, and Ⅲ). Notably, Anomaly Ⅱ coincided precisely with the Ps1 and Ps20 structural fracture zones, indicating an ore‐induced anomaly with excellent prospecting potential. Based on the analysis of prospecting potential, exploration techniques such as trenching and drilling were employed to verify the deep extension of ore(mineralized)bodies in areas with prospecting potential and to investigate the metallogenic geological characteristics. This led to a breakthrough in prospecting, with the discovery of 4 gold mineralized bodies, named Kh7, Kh8, Kh14, and Kh16, respectively. The research findings can provide valuable references for fundamental geological research and prospecting breakthroughs for similar deposits within the region.

     

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