云母类粘土矿物的研究及其地质意义

A study on Al-Dioctahedral mica group minerals and its geological significance

云母类粘土矿物的研究及其地质意义刘云（中国科学院南京地质古生物研究所，江苏南京，２１０００８）关键词云母类粘土矿物，红外谱线变化，矿物学研究，地质意义铝二八面体云母类粘土矿物是蒙脱石一伊利石、蒙脱石混层一伊利石系列的一个过渡型矿物，在沉积岩中广泛分布...

Twelve clay samples consisting largely of illite have been selected for the mineralogical study by means of IR, X-ray, DTA, chemistry, SEM, ect. The analytic results show that the intensity and shape of IR absorption bands near 3600,830, 750cm-1 are changed with sample, which is related to illite ordered degree,when above absorption bands are changed from sharp into broad, from strong to weak, the illite polymorph is transformed from 2M-1Md mixed to 1Md, the ordered degree decreasing and expansion layer increasing from <10 % to >63%, with the amount of H2O+ increasing and K+ values decreasing. Thus, it is possible to identify the structure ordering and mineral expansibility in the Al-Dioctahedral mica group minerals by means of infrared spectrum, which are useful in the indication of the degree of diagensis, and identity of detrital or diagenetic illite.