云南元阳大坪金矿成矿物质来源及成矿时代简析

Source and metallogenic epoch of the Daping gold deposit, Yuanyang, Yunnan

元阳大坪金矿位于哀牢山深大断裂西侧的浅变质带内,位于哀牢山金矿带南段,为石英脉型金矿床。矿区内出露上元古代哀牢山群中-深变质岩,古生代奥陶系、志留系和泥盆系,区内断裂构造发育,以北向西、北北西向为主,区内地质活动频繁。该金矿床受哀牢山深大断裂次级断裂小寨-金平断裂、小新街断裂和三家断裂所夹持。大坪金矿主要赋存于哀牢山断裂西侧脆-韧性剪切带中。矿床分布于小新街断裂东、西两侧,脉状成群产出。依据矿化特征与小新街断裂带在空间上的位置,将大坪金矿分成东矿带及西矿带。本文简略说明大坪金矿成矿物质来源、成矿流体及成矿时代。

The Daping gold deposit in Yuanyang is located in the shallow metamorphic belt on the western side of the deep fault in Ailao Mountain. It is located in the southern section of Ailao Mountain gold belt and is a quartz vein type gold deposit. In the mining area, the middle and deep metamorphic rocks of the Ailao Mountain group were exposed in the Proterozoic, and the Paleozoic Ordovician, Silurian and Devonian systems were found in the Paleozoic, and the faults were developed in the area. The gold deposit is sandwiched by the Ailao Mountain deep fault secondary fault, the Xiao Zhai Jinping fault, the Xiao Xin Jie fault and the three faults. The Daping gold deposit mainly occurs in the brittle ductile shear zone on the western side of Ailao Shan fault. The deposits are distributed on the East and west sides of the Xiao Xin Jie fault, and the veins are distributed in groups. The Daping gold mine is divided into the east ore belt and the west ore belt according to the mineralization characteristics and the space location of the Xiao Xin Jie fault zone. This paper briefly describes the source of ore-forming material, metallogenic fluid and metallogenic epoch.