青海都兰县五龙沟金矿床地质特征与矿床成因

青海省都兰县五龙沟金矿资源前景较好,本次研究在以往地质矿产勘查工作的基础上,开展槽探、硐探、钻探工程,并采集样品进行岩石薄片、光片等检测分析工作,对五龙沟金矿成矿地质条件与矿床成因开展系统研究。研究结果表明:五龙沟金矿赋存于VII、IX、X、XI四条含矿破碎蚀变带中,圈定金矿体192余条,估算金资源量61.18 t。矿石中金的赋存状态均以独立矿物的形式存在,最主要的金矿物为自然金。矿石结构主要有粒状结构、鳞片变晶结构、交代结构、压碎结构、包含结构等。矿石构造主要以浸染状构造为主。金水口群及青白口系含金背景值高,为金矿集中区的形成提供了重要矿质来源,其与花岗岩体接触带是本区含矿断裂构造产生的基本位置,韧性剪切带的多次活动为金矿热液上升、运移提供了通道,也为金富集成矿提供了重要场所。金矿床成因类型属中低温岩浆热液型。

Geological characteristics and genesis of Wulonggou gold deposit, Dulan county, Qinghai province

The resource prospect of Wulonggou gold deposit is perspective in Dulan county, Qinghai province . This study is based on the previous geological and mineral exploration work, the trenching, tunnel exploration and drilling engineering have been Carried out, samples are collected for the analysis of rock thin section and light .lm, this paper systematically studied the geological conditions and genesis of gold deposits in Wulonggou area. The results show that Wulonggou gold deposit occurs in VII, IX, X and Xi four ore bearing fractured alteration zones, more than 192 gold ore bodies have been delineated, and the estimated gold resource is 61.18 tons. The occurrence of gold in ores is in the form of independent minerals, the main gold mineral is natural gold. The ore structure mainly includes granular structure, scale crystallographic structure, metasomatic structure, crushing structure and inclusion structure. The ore structure is mainly disseminated structure. The gold bearing background values of Jinshuikou group and Qingbaikou system are high, which provided an important mineral source for the formation of gold concentration area, the contact zone with granite body is the basic position of ore bearing fault structure in this area. The multiple activities of ductile shear zone provide a channel for the rise and migration of gold ore hydrothermal solution, which also provides an important place for gold rich integrated ore. The genetic type of gold deposit belongs to medium low temperature magmatic hydrothermal type.