砒砂岩的结构组成研究

Study on the Structural Composition of Pisha Sandstone

明晰砒砂岩的结构组成和矿物组成,是揭示砒砂岩地区水土流失机制及研发治理砒砂岩地区水土流失方法的基础。通过借助定量XRD及光学显微镜分析等材料分析法,分析中国内蒙古鄂尔多斯地区砒砂岩的结构组成和矿物组成。结果表明:砒砂岩的结构由颗粒状骨架物质和黏土类胶结物质组成,其胶结方式为接触式胶结;砒砂岩颗粒状骨架物质主要由石英、碳酸钙及长石等组成,黏土类胶结物质为蒙脱石、绿泥石、高岭石及氧化铁等;砒砂岩颗粒状骨架晶体(石英和长石等)是依靠亲水弱胶结黏土物质的胶结力、晶体间的摩擦力、机械咬合力及颗粒支撑作用所形成的固体混合物,为三元颗粒支撑渗透式结构。

Clarifying the structural composition and mineral composition of arsenic sandstone is the basis for revealing the mechanism of soil erosion in the arsenic sandstone area and developing methods for controlling soil erosion in the arsenic sandstone area. This article analyzes the structural composition and mineral composition of arsenic sandstone in the Ordos area of Inner Mongolia by means of material analysis methods such as quantitative XRD and optical microscope analysis. The results show that:the structure of arsenic sandstone is composed of granular framework materials and clay-like cementing materials, and its cementing method is contact cementation;arsenic sandstone granular framework materials are mainly composed of quartz, calcium carbonate and feldspar, etc. Clay cementing materials are montmorillonite, chlorite, kaolinite and iron oxide, etc.;arsenic granular framework crystals(quartz and feldspar, etc.) rely on the cementing force of hydrophilic weak cementing clay materials. The solid mixture formed by friction between crystals, mechanical bite force and particle support is a ternary particle support permeable structure.