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下湖铂钯矿点,位于闽北加里东褶皱隆起带,竹洲—仙阳复式背斜南西段近轴部的低角闪岩变质相带。是福建省唯一的赋存在变质岩系中的铜镍铂钯矿点。七十年代地质工作结果认为属岩浆熔离矿床类型,成矿母岩是变质基性岩一斜长角闪岩类。近来,笔者由于参加麻源群地层专题工作,有机会接触矿区大量原始资料,经结合区域地质背景初步分析,感到很有必要对所谓的铂钯成矿母岩—斜长角闪岩类的成因性质和可能的原岩类型进行讨论。至于矿点其他岩类的成因性质,由于显而易见的变余沉积特征——变余砂状结构,层状构造等——已早被人们公认为副变质岩系,本文不多涉及。
Xiahu Pt-Pd deposit is located in the low-amphibolite metamorphic facies belts of the Caledonian fold uplift in northern Fujian and the paraxial parts of the southern part of the Zhuxian-Xianyang duplex anticline. It is the only copper-nickel platinum-palladium deposit in Fujian Province that is hosted in metamorphic rocks. Seventies geological work results that belong to the type of magmatic eruptive deposit, the metallogenic rock is a metamorphic basic rock an amphibolite. Recently, due to participating in the Mayuan stratigraphic work, the author had the opportunity to contact a large amount of raw materials in the mining area. Based on the preliminary analysis of the regional geological background, I felt that it is necessary for the authors to analyze the genesis of the so-called platinum-palladium metallogenic rock-amphibolite Nature and possible types of protoliths are discussed. As for the genesis of other rock types in the ore-hosting area, it has not been much discussed in this paper due to the obvious characteristics of the remnant sedimentary-variable sand structure, stratiform structure and so on.