鹤岗煤田泥质岩粘土矿物类型及其地质意义

为了确定鹤岗煤田泥质岩粘土矿物类型及其地质意义,本文采用X射线衍射仪和扫描电镜研究了鹤岗煤田12个泥质岩样品中的粘土矿物。结果表明:本区泥质岩共有4种类型的粘土矿物,并揭示出高岭石主要为来自剥蚀区的碎屑粘土矿物,少部分为自生矿物,伊利石一部分由剥蚀区搬运来,另外则由长石、云母等铝硅酸盐矿物风化形成,伊蒙混层矿物是在成岩过程中,由蒙脱石向伊利石转化的过渡产物,绿泥石则是在深埋阶段由高岭石转变而成。这项研究说明该区在整个晚侏罗世演化过程中处于近中性环境,并在弱酸弱碱环境中频繁振荡。

Clay mineral type and geological significance of mudstone in Hegang Coalfield

To determine the clay mineral type and geological significance of mudstone in Hegang Coalfield, the paper investigated the clay minerals of 12 mudstone samples in Hegang Coalfield by using X-ray diffractometer and scanning electron microscope. The result indicates that there are four types of clay minerals of mudstone in Hegang Coalfield, among which kaolinite primarily originated from rubble minerals of abraded area and minor kaolinite are authigenic minerals, and illite originated from abraded area and aluminumsilicate minerals such as feldspar and mica, mixed layer of illite and smectite are transitional minerals when smectite were transformed into illite during diagenetic stage, and chlorite were transformed by kaolinite. The study indicates that Hegang Coalfield is in neutral environments and oscillating in the environment of weak acid and weakly alkali in Late Jurassic.