青海同德县加吾金矿控矿因素与找矿标志

加吾金矿位于秦岭造山带西缘与东昆仑造山带东部衔接部位的青海南山造山带内。区内地层以隆务河群中三叠统为主,构造主要为北北西向,除曲如沟花岗闪长岩体外,其余以岩脉产出。矿区内发现矿区内共发现矿脉23条,依据产出地理位置不同划分为4个脉群。区内矿体产出受地层、构造、岩浆岩等多种因素控制,断裂构造起主要作用,同时矿体在地层中的分布有一定的专属性,矿体主要集中产于中三叠统第三岩组碳质板岩夹砂质板岩中,区内主要的曲如沟花岗闪长岩体对矿体影响不大,但矿区内花岗斑岩脉对矿体影响明显。找矿标志主要有碳质板岩、新近系红色砂砾岩层、构造破碎带、花岗斑岩脉、负地形(洼地、沟谷、鞍部)等。

Ore-controlling Factors and Prospecting Indicator of Jiawu Gold Deposit in Tongde County,Qinghai Province

Jiawu gold deposit is located in Nanshan geosyncline zone of the jointing part between the Eastern Kunlun and the Western Qinling. In this area, the main stratum is middle Triassic Longwu group, the main strike direction of structure is NNW, and all magmatic rocks are dykes except Qurugou granitic rocks. 23 veins in the mining area were found in the ar-ea and 4 vein groups are delineated according to the geographical position. The ore-bodies are controlled by stratum, struc-ture, and magmatic rocks, wherein fault structure plays a major role. At the same time the distribution of ore body in the formation features certain specificity. The ore body is mainly concentrated in the carbonaceous slate clip sandy slate in the Third Rock Group of the Middle Triassic. The ore body is little impacted by the main Qurugou granitic rock in the area, and significantly impacted by the granite porphyry vein in the mining area. The prospecting indicators include mainly carbona-ceous slate, neogene red gravel strata, tectonic fracture zone, granite porphyry dyke, negative terrain ( swales, gully, Col) , etc.