【摘要】 内蒙地区由花岗岩、玄武岩和黄土状沉积物等三种不同母质所发育的暗粟钙土,经理化分析、差热分析和X射线鉴定表明,剖面中颗粒分布状况大致相近,剖面中部微有粘化现象。原生矿物的组成随母质不同而异,但粘土矿物的主要成分都是濛脱?我惩量笪锏某煞植钜旆从沉四钢实牟煌?这种差异在剖面下部愈益显著。各层粘土矿物组成的差异似乎表明,濛脱在干草原条件下,可经复钾作用而演变为伊利石,也可风化为高岭石。更多还原

【Abstract】 A comparative study of the chemico-mineralogical properties of three profiles of chestnut earth of Inner Mongolia developed from granite, basalt and loess were made by chemical analysis, thermal differentiation and X-ray diffraction. The composition of the primary minerals of the three soils differs markedly, but that of the secondary minerals remains much alike. They are composed essentially of montmorillonite, although illite is also present. The influence of parent materials shows more prominantly in the accessory secondary minerals, especially in the deeper soil horizons. It is suggested that under the steppe condition, montmorillonite might be elther transformed into illite through repotassication, or weathered into kaolinite.更多还原