天然粘土样品分析的伊利石/蒙皂石间层矿物的间层比计算方法

A PRECISE PROCEDURE OF THE PROPORTION OF SMECTITE LAYER CALCULATION SUITABLE FOR INTERSTRATIFIED ILLITE/SMECTITES ANALYSIS OF NATURAL CLAY SAMPLES

陈洪起 赵杏媛 张有瑜

Chen Hongqi Zhao Xingyuan Zhang youyu

石油勘探开发科学研究院, 北京

Scientific Research Institute of Petroleum Exploration and Development, Beijing

乙二醇(EG)处理定向样品的X射线衍射谱图上有无17Å衍射峰,是区分伊利石/蒙皂石无序间层和伊利石/蒙皂石有序间层的重要标志.实验证明,对于纯样品,伊利石/蒙皂石无序间层矿物的17A衍射峰强度变化主要决定于间层比(S%)的大小;对于天然样品,尤其是含有分散伊利石的天然样品,伊利石/蒙皂石无序间层矿物的17Å衍射峰强度除了受间层比的影响以外,还受样品中该间层矿物相对含量的影响,即受其它伴生矿物,尤其是分散伊利石相对含量的影响.本文根据具不同间层比的纯伊利石/蒙皂石无序间层矿物与分散伊利石以不同比例的混合样品的X射线衍射分析结果,提出一种适用于天然粘土样品分析的伊利石/蒙皂石无序间层矿物的间层比计算方法,同时还介绍天然粘土样品分析的伊利石/蒙皂石有序间层矿物的间层比计算方法.

The 17Åreflection of the XRD pattern of oriented preparation ethy-lene glycol-solvated sample is an effective indicator to distinguish the disorderly from orderly (IS-ordered and ISII-ordered) illite/smectite interstrata.The experiments in this paper shows that the 17Åreflection intensity of disorderly interstratified illite/smectite varied mainly with the proportion of smectite layers (S%) for the pure sample rather than with the proportion of smectite layers (S%),but also with the disorderly interstratified illite/smectite content (I/S(%)) and other types of mineral contents,especially the content of discrete illite (I(%)) for the mixtures.From the XRD data of mixture samples composed of disorderly interstratified illite/smectite with two different proportions of smectite layers (S%) and different contents of discrete illites (I/S(%)),a precise procedure on the proportion of smectite layers (S%) calculation suitable for disorderly interstratified illite/smectite analysis of natural clay samples has been deduced.In the paper,a precise procedure on the proportion of smectite layer calculation suitable for orderly interstratified illite/smectite analysis of natural clay samples also has been deduced based on the data of Srodons publication (1984) and author's practical XRD analyses.

https://doi.org/10.11781/sysydz199104408