应用^（29）Si和^（27）AlMASNMR谱研究粘土结构

APPLICATION OF ￣(29)Si and ￣(27)Al NMR TO CHARACTERIZING CLAY MINERALS

用２９Ｓｉ和２７ＡｌＭＡＳＮＭＲ谱研究粘土矿物，可测定其化学位移及四面体、八面体相对含量和粘土中伴生矿物（ＳｉＯ２）ｘ的含量，得出高岭石、伊利石结晶度和峰宽关系。该实验技术可鉴定不同类型的粘土矿物及其含量，可用于粘土矿物的物源、成因环境和有机质热演化等方面的研究。

In this paper, various natural clay minerals: montmorillonite, kaolinite, illite, chlorite, pyrophyllite, talc and mixed layer clay have been studied by solid-state 29Si and 27Al magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR). 29Si and 27Al chemical shift, the extend of 27Al substitution for 29Si and the extent of (SiO2 ). of clay minerals are detected. There are some relations between 29Si chemical shift and Si-Al micro-ordering [Si(nAl)] configuration, and between line width and crystallinity. We found that to distinguish between two kinds of illite and montmorillonite maybe depends on diagenesis and to distinguish between randomly interstratfied I/S and orderly interstratified I/S also maybe depends on diagenesis. 29Si and 27Al NMR application to petroleum geochemistry and sedimentology is discussed.