DIAGENETIC KAOLINITE DICKITE (BETIC CORDILLERAS, SPAIN)

被引:23
作者
CRUZ, MDR
REAL, LM
机构
[1] Departamento de Química Inorgánica, Cristalografía y Mineralogía, 29071, Málaga
关键词
CRYSTALLINITY; DICKITE; DIFFERENTIAL THERMAL ANALYSIS; ELECTRON MICROSCOPY; INFRARED SPECTROSCOPY; INTERSTRATIFIED MINERALS; KAOLINITE; THERMOGRAVIMETRY; X-RAY POWDER DIFFRACTION;
D O I
10.1346/CCMN.1993.0410507
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The lower Permo-Triassic sediments of the Malaguide Complex contain abundant dickite. Whole rocks were studied by optical microscopy, scanning electron microscopy, and X-ray powder diffraction. The 2-20 mu m and <2 mu m size fractions were extracted and analyzed by scanning and transmission electron microscopy, X-ray powder diffraction, infrared spectroscopy, differential thermal analysis, and thermogravimetry. In the coarse-grained samples, the 2-20 mu m size fraction consisted of well-crystallized dickite associated with minor quantities of kaolinite, illite, quartz, and hematite. XRD patterns of the fine-grained samples and the <2 mu m fractions showed the existence of well-crystallized minerals in which several reflections of dickite (11l, 02l) were absent and the 132/13(2) over bar reflections were shifted. These patterns suggest the presence of an intermediate member between well-crystallized dickite and well-crystallized kaolinite. Only locally high-order reflections are present at 10.5 Angstrom and 18-22 Angstrom. DTA and IR data agree with those from XRD. The observed compositional and structural variations are a function of the lithology and the particle size of the sample. The sequence kaolinite --> kaolinite/dickite --> dickite is proposed for the development of these materials during Alpine metamorphism.
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页码:570 / 579
页数:10
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