青海省红石山地区金矿床地球化学异常特征及找矿潜力分析

红石山地区金矿床位于东昆仑多金属成矿带中段,研究区通过1∶5万水系沉积物测量圈出4处以As、Sb为主的综合异常;通过1∶2.5万地球化学测量圈出4处以Au、As、Sb为主的综合异常。不同比例尺的化探异常位置基本吻合,而Au异常最为明显,且与断裂构造关系最为密切,为本区金矿找矿提供了依据。进一步对3处以Au、As、Sb为主的1∶2.5万综合异常实施地化剖面、槽探、浅钻工程,圈出含金构造破碎蚀变带4条,带内圈定8条金矿体、6条金矿化体。区内矿化主要赋存于中三叠统洪水川组和闹仓坚沟组地层之间的构造破碎蚀变带中,矿化受北西西向断裂构造控制明显,主要赋矿岩性为构造碎裂岩及强硅化蚀变岩。综上所述,研究区具有优越的成矿地质条件,地球化学异常发育,经检查发现了较好的金矿找矿信息,充分展示出本区具有较大的找矿潜力,通过进一步工作,有望取得较好的找矿成果。

Geochemical anomaly characteristics and prospecting potential of gold deposits in the Hongshishan Area, Qinghai Province

The Gold deposit of Hongshishan area is located in the middle part of East Kunlun polymetallic metallogenic belt, four comprehensive anomalies dominated by As and Sb were circled by 1/50000 stream sediment survey. But after the 1/25000 stream sediment survey, four Au, As and Sb dominated comprehensive anomalies were delineated, which showed that through geochemical exploration work in different scales, the anomaly positions were basically consistent, but Au anomaly appeared more obviously, showing a closer relationship with fault structure, laying the foundation for the prominence of gold ore prospecting in this area. After carrying out geochemical profiles, trenching and shallow drilling engineering in the three Au, As and Sb anomaly area of 1/25000 stream sediment survey, we marked out four gold-containing fragmentation and alteration zones, eight gold mineralization bodies and six polymetallic bodies. The mineralization in this area was mainly occurred in the construction of alteration zone between the stratum of the middle Triassic Hongshuichuan group and Naocanggou group, and it was controlled by the NWW-trending fault. The gold mineralization is related to tectonic fissure rocks and strongly silicified altered rocks. In conclusion, the Hongshishan area has excellent metallogenic geological conditions and developed geochemical anomalies, where has found good prospecting information for gold deposition, showing that this area has a large ore prospecting potential and is expected to achieve good ore prospecting results by carrying out further work.