Clay fraction is dominated by illite and kaolinite with small proportions of smectite, chlorite and vermiculite.
Clay fraction is dominated by illite and kaolinite with small proportions of smectite, chlorite and vermiculite.
粘粒组成主要为伊利石和高岭石，也有少量蒙皂石、绿泥石和蛭石。