福建武平青径矿区羊坡塘矿段银多金属矿床地质特征

Geological Characteristics of Silver Polymetallic Deposit of Yangpotang Ore Section of Qingjing Mining Area in Wuping County, Fujian Province

武平青径矿区银多金属矿床受基底与火山岩系不整合面附近发育的一组断裂裂隙带控制,矿体主要贮存于中粗粒-细粒花岗岩中(紫金岩体组成部分)。矿体主要呈似层状,次为脉状,走向总体为北北东向,部分近北东向,倾向南东,局部北西向,倾角较平缓,从北东往西南方向矿体呈波状起伏。区内矿石工业类型为花岗岩型硫化银(金)矿石、花岗岩型硫化黄铜矿石及英安岩型硫化黄铜矿石。区内银金矿化年龄为(91.47±0.39)Ma;区内成矿热液主要来自次火山活动期后的中低温热液。根据矿体的主要产出部位以及矿石特征等,研究认为该区矿床与晚白垩世中酸性火山-次火山作用有成因联系,应属于中低温热液银多金属矿床。

The Qingjing silver polymetallic deposit in Wuping area is controlled by a group of fractured zones developed near the unconformity surface of basement and volcanic rock series. The orebody is mainly assigned to medium coarse-grained granite(Zijin rock mass component). The orebody is mainly layered, secondary vein. Its the general direction is north-east, part is near north-east, tends to south-east, local north-west direction. The inclination angle is more gentle. The orebody is wave-like undulation phenomenon from north-east to southwest direction. The ore industry types in the area are granite silver sulfide(gold) ore, granite type sulphide brass ore and Ying’an type sulphide brass ore. The age of silver mineralization in the area is(91.47±0.39 Ma). The ore-forming hydrothermal solution mainly comes from the middle and low temperature hydrothermal solution after the subvolcanic activity period. According to the main producing site and ore characteristics of the ore body, it is considered that the ore deposit in this area should belong to the middle and low temperature hydrothermal silver polymetallic deposit with genetic relationship between intermediate in the late Cretaceous.