青海省赛什腾山地区三角顶金矿区地质、地球化学特征及找矿方向

Geological,geochemical characteristics and prospecting direction of the Sanjiaoding Gold District in Saishiteng mountain area,Qinghai Province

三角顶金矿床地处南祁连山南缘、柴达木盆地北缘,位于赛什腾山—阿尔茨托山PbZn-Au-W-Sn(Cu、Co、稀土)成矿带赛什腾山成矿亚带。三角顶金矿床矿石类型主要为黄铁矿化、褐铁矿化石英脉型,次为黄褐色碎裂岩化、褐铁矿化蚀变花岗闪长岩型。含矿石英脉产出于花岗闪长岩节理、裂隙中,北西向构造为主要的控矿因素,围岩蚀变有青磐岩化、硅化、钾化,局部可见糜棱岩化。1∶1万土壤测量显示,矿区内Au异常明显,共圈定组合异常13处,其中AP4、AP5、AP7、AP9异常具有良好的找矿潜力。

The Sanjiaoding Gold Deposit is located in the south margin of southern Qilian mountain and north margin of Qaidam Basin,and Saishiteng mountain metallogenic sub-belt of Saishiteng mountain-Alzto mountain Pb-Zn-Wu-W-Sn(Cu,Co and rare earth)metallogenic belt.The ore types in Sanjiaoding Gold Deposit are mainly pyritiztation,ferritization quartz vein type,and secondarily cataclasitic and ferritization alteration granodiorite.The ore-bearing quartz vein occurs in the joint and fissure of granodiorite,and NW-trending structure is the main ore-controlling factor.The wall rock alteration is composed of propylitization,silicification and potash feldspathization,and local mylonitization.According to 1∶10 000 soil survey,Au anomaly in the district is obvious.13 combination anomalies are delineated,among which the AP4,AP5,AP7,AP9 combination anomalies have good prospecting potentials.