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不规则伊／蒙混层粘土矿物在沉积地层中广泛存在，通过对１７例伊／蒙混层粘土矿物样品进行系统研究得出：（１）沉积地层中的部分有序型伊／蒙混层矿物的晶层连接概率介于完全随机混层与机械混和物的连接概率之间；（２）伊／蒙混层中的蒙皂石晶层向伊利石的转化分两步完成：两层水蒙皂石单层水蒙皂石伊利石；（３）随着成岩作用的进行（埋藏深度增加），Ｉ／Ｓ中的Ｉ晶层含量增加，在此同时，Ｉ／Ｓ晶体结构中四面体片的类质同相代换增加，四面体电荷及总层电荷亦增加，匹配该增加部分电荷的是层间域Ｋ的含量明显增加；（４）在沉积地层中的Ｉ／Ｓ混层矿物中，Ｉ晶层具有白云母的成分特点，层电荷为０．７５左右；Ｓ晶层则具有纳蒙脱石的成分特点，层电荷为０．３０左右
The results show that: (1) Partially ordered crystal of the mound / montmorillonite layer in the sedimentary strata is obtained by systematic study of 17 Iraqi / mulitided clay mineral samples. Layer connectivity probability lies between the completely random mixture and the probability of the mechanical mixture joining; (2) The conversion of the smectite layer to the illite in the i / hue layer is done in two steps: two layers of water smectite Monolayer water smectite illite; (3) with diagenesis (burial depth increased), I / S in the I crystal layer content increased at the same time, I / S crystal structure tetrahedron sheet In the I / S mixed mineral in the sedimentary strata, I (superscript +) and (superscript +) in the mixed strata of I The crystal layer has the compositional characteristics of muscovite, the layer charge is about 0.75; the S crystal layer has the characteristics of nano-montmorillonite, the layer charge is about 0.30