东北辽河盆地混合层粘土矿物及其与沉积环境的关系

混合层粘土矿物是由两种或两种以上不同类型的粘土矿物晶层按不同比例、沿(001)基面平行地、相互重迭地组成规则或不规则结构的一种过渡型矿物。它是从一种粘土矿物向另一种粘土矿物转变的中间产物。自格鲁那(J.W.Gruner)于1934年在研究蛭石的过程中首次发现混合层矿物以来,相继有许多学者陆续报道了混合层矿物。经大量研究证明,混合层矿物分布极为广泛。

STUDY OF A MIXED-LAYER CLAY MINERALS FROM THE LIAOHE BASIN OF NORCHEAST CHINA AND THEIR SEDIMENTARY ENVIRONMENT

X-ray diffraction analysis shows that the three fresh clay samples collected from cores of Oligocene Sha-3 members in a region of Northeast China are irregular mixed-layer illite-montmorillonite minerals. The respective propertions of both layers were also estimated from the diffraction diagrams. It is suggested that the presence of mixed-layer minerals reflects to a certan extent the changes in the sedimentary environment and physico-chemical conditions during their formation.