Metallogenic Conditions and Modes of the Qinglongou Gold Deposit in Tanjianshan Area, Qinghai
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摘要: 青龙沟金矿床位于柴达木盆地北缘赛什腾山-阿尔茨托山造山亚带，是青海省柴北缘成矿带最具找矿潜力的矿床。分析和研究滩间山地区青龙沟金矿床成矿条件及模式，对于在该区进行进一步找矿工作和寻找构造热液蚀变型矿床具有重要的指导和借鉴意义。为研究青龙沟金矿床成矿条件及模式，笔者首先收集了青龙沟金矿床大地构造背景、地层、构造、岩浆岩等方面的资料，对青龙沟金矿床特征分别进行了描述；然后从地层、岩浆岩、构造等3个方面对成矿条件进行了系统的分析和总结，认为青龙沟金矿床具有沉积变质变形，岩浆热液成矿作用的先后富集、叠加等特点，其成因应属岩浆期后热液型和构造蚀变岩型金矿床。其成矿模式经历了：①早期黑色含金岩系沉积期。②金元素初步富集期。③金矿化富集期。④金矿化叠加富集期。该研究对于该区进一步深部找矿工作和寻找构造热液蚀变型矿床具有借鉴意义，有一定的参考价值。Abstract: The Qinglonggou gold deposit is located in Saisitengshan-Aerzituoshan orogenic subzone of Nort Qaidam, which has most prospecting potential in the North Qaidam metallogenic belt of Qinghai Province. The ore-forming condition and the model of this gold deposit have been analyzed and studied in this paper, which has important guidance and reference significance for prospecting the structural-hydrothermal alteration type deposits and other further ore-prospecting works in this area. In this paper, the geotectonic background, regional strata, lithology, structure, magmatic rocks and other information about the Qinglonggou gold deposit have been collected, and then the geological characteristics of this deposit has been described. Finally, from the aspects of strata, magmatic rocks and tectonic, the metallogenic conditions of this deposit have been systematically analyzed and summarized. The results show that this deposit has experienced the sedimentary metamorphic deformation, showing the enrichment and superposition characteristics of magmatic hydrothermal mineralization. Thus, this deposit belongs to postmagmatic hydrothermal type and tectonic altered rock type gold deposit. The ore-forming process was experienced three periods, that is ① sedimentary period of black gold-bearing rock series in early stage, ② initial enrichment period of gold element, ③ enrichment period of gold mineralization and ④ superimposed enrichment period of gold mineralization. This study has a reference value for further ore-prospecting works and prospecting the structural-hydrothermal alteration type deposits and other in this area.
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