Metallogenic Conditions and Modes of the Qinglongou Gold Deposit in Tanjianshan Area, Qinghai

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.