青海同德小曲如沟—加日亥一带地质地球化学特征及钨矿找矿潜力分析

Geological,Geochemical Characteristics and Prospecting Potential of the Tungsten Ore in Xiaoqurugou-Jiarihai Area,Tongde County,Qinghai Province

研究区大地构造位置处于东昆仑与西秦岭衔接部位,经历了复杂的构造演化过程,出露地层主要为中—下三叠统隆务河群,中酸性岩浆岩发育,成矿地质条件优越,已发现显龙沟锑金矿、加吾金矿等矿床,但区内以前未发现有钨矿化。以1/5万水系沉积物测量原始数据为依据,对研究区内地质、地球化学特征及成矿条件进行分析,结合实际找矿工作,认为区内W、Au、Ag、As、Sb元素富集程度较高,在钨矿找矿方面具有很大潜力,指出有利找矿地段为隆务河群第二岩性段内钨异常分布区,赋矿岩性为中薄层砂岩及板岩段内厚大的中薄层砂岩夹层,矿化类型以蚀变岩型及石英脉型为主。

The study area is located at the join position between the eastern Kunlun and the West Qinling,which experiences a complex tectonic evolution,consists of the Lower Triassic Longwuhe Group strata mainly,and outcrop mediate-acidic magmatic rocks,but the tungsten mineralization did not been discovered before.The Xianlonggou antimony-gold deposit and the Jiawu gold deposit have been discovered un the area,it displays a good geological metallogenic condition.The primary data of 1/50 000 stream sediments suggest that it enriches the W,Au,Ag,As and Sb elements in the area.Analyzing the geological and geochemical characteristics and the regional metallogenic conditions,combining with the actual prospecting work,all these indicate that the Xiaoqurugou-Jiarihai mine has better tungsten-forming potential.As mentioned above,we propose that the tungsten anomalies are the first precondition and the favorable object for the tungsten prospecting,which is predominated by the alteration rock and quartz vein type mineralization,the medium-thin sandstones and the thin sandstone inter-layers within slate,which belong to the second rock department of the Longwuhe Group.