太行山南段桃园铜矿地质特征及成矿作用

Geological Characteristics and Mineralization of Taoyuan Copper Deposit in South Part of Taihang Mountain

桃园铜矿位于太行山南段赞皇幔枝构造的西侧,其周边地区先后发现了铜矿床(点)达30余处。由于桃园铜矿的研究程度相对较低,对其成因和成矿模式还没有清晰的认识。为进一步探讨矿床成因,以现代矿床理论为基础,通过野外地质调查和锆石U-Pb定年等手段对桃园铜矿做了进一步探讨,并得出以下认识:桃园铜矿的成矿物质主要来源于辉绿岩脉、次玄武岩和甘陶河群南寺掌组变质砂板岩;主要控矿构造为次玄武岩、变质砂板岩等岩性中节理、裂隙;热源来自深部隐伏的中生代岩浆热液活动,由此可以确定桃园铜矿属于中生代热液型矿床。另外,结合矿区地球化学异常特征及矿点位置的分布,得出银河铺—虎寨口和白鹿角—桃园—槐树庄一带,有很大的找矿前景。

Taoyuan copper deposit is located in the west side of Zanhuang mantle branch structure from the southern part of Taihang Mountain.More than 30 copper deposits(points)have been discovered in the surrounding area.Because of the relative low degree researches,there is no clear understanding of its origin and metallogenic model.In order to further explore the origin of the copper deposit and summarize the regularity of mineralization,the Taoyuan copper deposit is further discussed in this paper by means of field geological survey and zircon U-Pb dating on the basis of modern deposit theory,and the following conclusions are drawn:the ore-forming materials of Taoyuan copper mainly come from diabase dike,sub-basalt and metamorphic sand slates of Nansizhang Formation in Gantaohe Group;the main ore-controlling structures are joints and fissures in sub-basalt and metamorphic sand slates;the heat comes from deep Mesozoic magmatic hydrothermal activity.Therefore,it can be concluded that Taoyuan copper deposit belongs to Mesozoic hydrothermal type deposit.In addition,combined with the geochemical anomaly characteristics of the mining area and the distribution of mineral location,it is concluded that Yinhepu—Huzhaikou and Bailujiao—Taoyuan—Huaishuzhuang areas have great prospecting prospects.