青海独树沟金矿区地质特征及找矿前景

Geological characteristics and prospecting potential of Dushugou gold deposit,Qinghai

独树沟金矿区位于青海省大柴旦镇境内,大地构造隶属秦祁昆造山系东昆仑造山带赛什腾山—阿尔茨托山造山亚带。在总结区内地层、构造、岩浆岩的基础上,分析了矿体特征,得出矿体主要位于构造破碎蚀变带或其上下盘位置,含矿岩性主要为炭质绢云千枚岩,次为白云石大理岩,主要矿化蚀变有黄铁矿化、褐铁矿化、黄钾铁矾化、硅化。地层、构造、岩浆岩均对该区成矿具有明显的控制作用。矿床成因类型为中温热液构造蚀变岩型。区域化探资料显示,该区异常具规模大、浓集中心明显、峰值高等特征,通过分析认为该区成矿条件优越,找矿前景良好。

The Dushugou gold deposit located at Dachaidan town,Qinghai Province, tectonically occurs in the Saishiteng-Alci- tuo orogenic subzone, eastern Kunlun orogenic belt within Qinling-Qilianshan-Kunlun orogenic system. On the basis of summarizing geological, structure and magmatic rocks and analyzing orebody characteristics, it is concluded that the gold ore bodies are mainly loca- ted in the fractured alteration zone or in hanging wall and footwall. The main host rock is carbonaceous sericite phyllite, secondary dolo- mite marble, the main mineralized alteration are pyritization, limonitization,jarositization and silicification. The strata, structure, mag- matic intrusion have obvious control for the gold mineralization in the region. The deposit genesis is mesothermal structured alteration type. The gegional geochemical data indicates that the geochemical anomaly has characteristics of large anamolous distribution, obvious concentration center and higher anomalous peak. The integrated analysis results show that there is favorable metallogenic conditions in the region and sounding prospecting potential.