青海亚日何师金矿床地质特征及成因

Characteristics and genesis of the Yariheshi gold deposit in Qinghai

亚日何师金矿区位于青海省中部,夹持于东昆南断裂和布青山南缘断裂之间,属阿尼玛卿铜、钴、锌、金、银成矿带,区内次级断裂构造发育,岩浆活动频繁,成矿物质组成丰富。亚日何师金矿床是近年来该成矿带上在马尔争组地层中发现的小型金矿床,赋矿岩石主要为褐铁矿化微晶灰岩、蚀变花岗斑岩,矿化主要分布于碳酸盐岩层间破碎带及花岗斑岩与围岩接触带,矿体受北西向断裂构造控制特征明显,共圈定金矿体14条。作者通过勘查实践,分析了亚日何师金矿床特征、找矿标志,总结了矿床成因,认为该矿床成因类型为构造蚀变岩型矿床。

The Yariheshi gold deposit is located in the central part of Qinghai Province,between the East Kunnan fault and the south edge of Buqingshan fault.It belongs to the Animaqing copper,cobalt,zinc,gold and silver metallogenic belt.The secondary faults in the area are well developed,magmatic activities are frequent,and the mineralizing material composition is rich.The Hoshi gold deposit in Yari is a small gold deposit discovered in the strata of Marzheng Formation in recent years.The ore-hosting rocks are mainly limonite microcrystalline limestone and altered granitic porphyry.Mineralization is mainly distributed in the interlayer fracture zone of carbonate rocks and the contact zone between granite porphyry and wall rocks.The ore bodies are obviously controlled by NWtrending faults,and 14 gold orebodies are delineated.Through exploration practice,the author has analyzed the characteristics and prospecting criteria of the Yari Hoshi gold deposit,summarized the genesis of the deposit,and considered that the genetic type of the deposit is structural altered rock type deposit.