贵州省福泉磷矿新桥磷矿构造沉积岩相特征及成矿模式简析

Tectonic Sedimentary Rocks Phase Fearure And Metallogenic Model Analysis Of Xinqiao Phophorus Mine In Guizhou province

新桥磷矿是陡山沱期磷矿的典型矿床之一,共有a、b两层磷矿,主要类型为砂屑磷块岩、白云质团块状磷块岩和致密块状磷块岩,a矿层以硅氧化物高、低镁,b矿层以高镁、低氧化物为特点。本矿区矿层构造岩相等特征的变化规律反映了沉积构造环境的改变,本区磷块岩的成矿条件中,除了一定的成矿期,特定的成矿域和适宜的古构造背景、陡山沱组的浅水碳酸盐构造沉积岩相、地层条件、气候状况等因素等是磷矿分布及富矿形成最主要的控矿因素。

Xinqiao phosphorite ore is one of the typical deposits of phosphorite ore in Doushantuo Fm.There are two layers of phosphorite ore,a ore and b ore.The main types are shavings phosphorite ore,dolomite lumpy phosphorite ore and dense lumpy phosphorite ore.Ore seam a is characterized by high and low magnesium silicon oxide,while ore seam b is characterized by high magnesium and low oxide.The change rule of the equal characteristics of orebed tectonic rocks in this area reflects the change of sedimentary tectonic environment.In the ore-forming conditions ofphosphorite ore in this area,besides a certain ore-forming period,specific ore-forming region and suitable paleotectonic background,shallow water carbonate tectonic sedimentary facies stratigraphic conditions of Doushantuo Formation,climatic conditions and other factors are the most important controlling factors for the distribution ofphosphorite ore and the formation of rich ore.