青海五龙沟地区金多金属矿成矿规律

Metallogenic Regularity of the Gold-polymetallic Deposits in Wulonggou Area,Qinghai Province

五龙沟金矿是青海省东昆仑成矿带最具找矿潜力的矿床。在搜集五龙沟地区金多金属矿床成矿大地构造背景、区域地层、岩性、构造、岩浆岩等方面资料的基础上,首先对区内典型金多金属矿床地质特征分别进行了描述,然后从地层、岩浆岩、构造等方面对区内金多金属矿床的控矿因素进行了系统分析,最后从矿床成矿时间、空间分布及成因等方面对成矿规律进行了总结。结果表明:1五龙沟地区金多金属矿床产于构造韧性剪切带中,受构造及其演化控制明显;2金矿床在时间上具有多阶段性和长期性的分布规律,在空间上严格沿3条韧性、脆-韧性剪切带分布,各剪切带内矿床具有等距性和平行性的分布特点;3多金属矿床多分布于剪切带与后期NE—SW向的断裂带交汇部位,往往成群成组分布;4金矿体形成于多金属矿之前,以深部岩浆为主的壳幔混源、壳源是金多金属矿的重要成矿物质来源,伴随构造演化使成矿物质进一步活化并富集形成金多金属矿体。上述研究成果对于区内进一步开展金多金属矿、构造热液蚀变型矿床的找矿工作具有一定的参考价值。

Wulonggou gold deposit is the most potential mineralization deposit in eastern Kunlun metallogenic belt of Qinghai province. Based on collecting the geological information of Wulonggou gold deposit including its ore-forming tectonic background,regional strata and intrusions,structure and so on,firstly,the geological characteristics of typical gold-polymetallic deposits in Wulonggou area are analyzed in depth; then,the ore-controlling factors of the gold-polymetallic deposits in Wulonggou area are analyzed systematically from the perspective of strata,magmatic rocks and structures; finally,the metallogenic regularity of the gold-polymetallic in Wulonggou area are summarized from the aspects of metallogenic time,space distribution and ore genesis. The results show that： 1Wulonggou gold deposit is located in the ductile shear zones and it is controlled obviously by the structure evolution; 2the gold deposits have the multiple stages and long-term distribution regularities in time domain while in spatial domain,the gold deposits are along the three ductile and brittle-ductile shear zones strictly,the deposits within the shear zones has the distribution characteristics of equidistance and parallelism; 3the gold-polymetallic deposits are located in the intersection zones of the shear zones and NE-SW trending fault,they are distributed in groups frequently; 4the gold orebody is formed before the polymetallic ore,deep magma is the main composition of crust-mantle mixed source and crust source,they are the important source of ore-forming materials,associated with the tectonic evolution,the ore-forming materials are activated further and enriched into polymetallic orebody. The above research results have some reference for the further prospecting work of gold-polymetallic and tectonic hydrothermal alteration type deposits in this area.