青海金龙沟金矿床地质特征及成因

文章着重分析了青海金龙沟金矿床的地质特征和矿床成因,结果表明:金龙沟金矿床受断裂构造控制明显,主要产于中元古界万洞沟群(Pt2W)炭质千枚岩和炭质片岩形成的复式褶皱层间断裂破碎带及层间滑脱带中;矿体形态以似层状、脉状、透镜状为主,且在褶皱轴部或者层间破碎带部位较发育,其厚度较大;含金黄铁矿具富砷、亏损硫,微量元素Co、Ni含量低,贫Cu、Pb、Zn、Hg、Se、Te的特征,是热液型黄铁矿的标型特征,其成矿与区域中酸性岩浆活动关系密切;金龙沟金矿床的形成是同生热水沉积初步富集金元素以及后期构造—岩浆活动再富集双重叠加作用而形成的,为中温热液脉型金矿,按照成矿动力学背景分类,应属造山型金矿中成类型,成矿发生在造山晚期地壳伸展阶段。

Geological characteristics and genesis analysis of Jinlonggou gold deposit in Qinghai Province

This paper focuses on the analysis of the geological characteristics of the Jinlonggou gold deposit in Qinghai and the genesis of the deposit,the results show that:the Jinlonggou gold deposit is obviously controlled by the fracture structure,which is mainly produced in the Middle Proterozoic Wan. The fracture break zone between the double folds and the interlayer slip zone formed by the carbon phyllite and the carbon schist. The ore body morphology is mainly layered,veined and lenticular,and it is more developed in the fold shaft or interlayer crushing zone,and its thickness is thicker,and the content of yellow ore rich with arsenic,loss sulfur,trace elements Co and Ni is low,poor Cu,Pb,The characteristics of Zn,Hg,Se and Te are the characteristics of hydrothermal pyrite,and its mineralization is closely related to the activity of acidic magma in the region,and the formation of Jinlonggou gold deposit is formed by the double superposition of the initial enrichment element of the same raw hot water deposition and the re-enrichment of the later tectonic-magmatic activity. According to the background classification of Metallogenic dynamics,it should belong to the type of orogenic gold deposit,which occurs in the stage of crustal extension in the late Orogenic period.