摘要
研究不规则混层粘土矿物的结构主要包括两个方面:一是混层粘土矿物的基本结构单元层的种类及比例;二是构造单元层的连结概率。不规则伊/蒙混层粘土矿物(以下简称I/S)在自然界分布极为广泛。在研究二叠/三叠系(以下简称P/T)界线层粘土矿物时,发现从我国西北到东南很多地区,该界线粘土层中均发育有I/S。利用X射线、红外光谱、电子显微镜和化学分析方法对湖南、湖北、四川和浙江等地的这种I/S,进行了系统的矿物学研究,并对其构造单元层的堆垛序列进行了深入探索(做了MacEwan一维直接傅里叶变换),还发现在c轴方向上,伊利石晶层和蒙脱石晶层的堆垛,可用Fibooacci序列进行推导,由此作者提出了这种I/S具有二维晶格一维准晶格的设想。
The study of irregular mixed-layer clay minerals from the P/T boundary layer have great significance in mineralogy and stratigraphy. The authors calculated the ratio of two kind structural units by chemical analysis and X-ray reciprocal vectors analysis, and also calculated the junction probabilities of the structural unit by MacEwan direct Fourier transform. Compared with the I/S minerals from the general sedimentary rocks, this kind of I/S has some special characteristics in mineralogy and thermodynamics. It is proved that it was formed by volcanic or cosmic dust. Using quasicrystal constructing theory, the authors attempt to construct the stacking sequences of the I/S crystal layers, the results are good. It is proposed that there exists in nature the material having two-dimensional crystal lattice and one-dimensional quasicrystal lattice, which is asupplement to the theory of quasicrystal particle fractional dimension model.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1993年第2期123-130,共8页
Acta Geologica Sinica
基金
国家自然科学基金(编号 4880082)
关键词
粘土矿物
混层
堆垛序列
晶格
mixed layer illite/smectite clay minerals
P/T boundary. MacEwan direct Fourier transform
quasicrystal lattice
particle fractional dimension
