Microstructure characteristics of illite from Chuanlinggou formation of changcheng system in Jixian County, Tianjin City
Microstructure characteristics of illite from Chuanlinggou formation of changcheng system in Jixian County, Tianjin City
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DOI：
10.1007/s11430-007-0090-0
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发表时间：
2007-10-01
期刊：
影响因子：
--
通讯作者：
Wang HeJing
中科院分区：
文献类型：
--
作者：
Chen Tao;Wang HeJing
The microstructure charateristics of illite from the Chuanlinggou Formation of Changcheng System (Chch) in Jixian County, Tianjin City has been studied by means of high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), X-ray energy dispersive spectrum (EDS) and X-ray powder diffraction (XRD). The KUbler index of "illite crystallinity" is 0.505 degrees Delta 2 theta, which indicates that the host rock is in a middle diagenetic stage. The chemical analyses of EDS for illite studied indicate a heavily absent in interlayer cation and an average chemical formula of K-0.57(Al1.80Mg0.42Fe2+ (0. 12))(Sigma=2.34)(Si2.92Al1.08)(Sigma=4)O-10(OH)(2). It is found, from one-dimensional lattice images, that the layers of illite not only stack in a flat way but also in a curving way. A "matting fabric" illite structure results from stacking faults. Combined with SAED analysis the illite studied can be affirmed as 1 M illite. The two-dimensional lattice images are obtained from [100] and [1110] incidences, whose lattice images have-the same devalues but different intersecting angles. The two-dimensional lattice image with [100] incidence is orthogonal to each other, whilst that with [110] incidence is oblique. This paper provides some important structure information of authigenic clay minerals for the well-known mesoproterozoic section of Jixian County.
