甘肃两当寺合金矿床地质特征及控矿因素浅析

Geological Characteristics and Ore-Controlling Factors of Sihe Gold Deposit,Gansu Province

沿西秦岭太阳寺—庞家河多金属成矿带,先后发现了西安河金矿、湘潭子金银矿、庞家河金矿和柳梢沟金银铅矿等大—中型矿床,而寺合金矿与柳梢沟金银铅矿毗邻。寺合金矿位于东峪—太阳寺断裂北侧的震旦—奥陶系丹凤群中,区内近EW-NEE向次级断裂较为发育,岩浆岩活动明显,矿化蚀变限定在构造变形带内,范围基本与矿体范围相一致,与成矿关系最为密切的蚀变有硅化、黄铁矿化和方铅矿化。该区矿体较薄,多赋存于次级断裂中。本次研究以寺合金矿为切入点,分析了寺合金矿乃至太阳寺一带的控矿因素,认为该区具有"三位一体"的控矿特点,并指出该区下一步找矿方向。

Along the Taiyangsi-Pangjiahe metallogenic belt,we have found Xi＇anhe gold deposit,xiangtanzi goldsilver deposit, Pangjiahe gold deposit, Liushaogou gold-silver-lead deposit and other large-medium sized deposits, and Sihe gold deposit adjacent with Liushaogou gold-silver-lead deposit.Sihe gold deposit is located in the north side of Dongyu-Taiyangsi fracture of Sinian-Ordovician Danfeng Group, nearly EW-NEE trending secondary faults are more development,magmatic activity is significantly,orebody occurrence in the secondary faults.The mineral- ization and alteration is defined in the tectonic deformation zone, the range of fundamental and orebodies range consistent,and mineralization is most closely connected silicification,pyritization and party lead mineralization. Taking Sihe gold deposit as the breakthrough point,we analyze the ore-controlling factors of Sihe gold deposit and Taiyangsi area,it is considered that the apparent ＂the trinity＂ ore-controlling conditions,and we point out the prospecting direction.