Differential thermal behaviour of clay minerals in some nile delta sediments, U.A.R.
✍ Scribed by Laila Fayed; M.I. Hassan
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 280 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0148-9062
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✦ Synopsis
Differential thermal analysis was performed on the clay fractions of some Nile Delta sediments at different depths. The relatively increasing size in low temperature endothermic peak (160-210°C) results either from adsorbed water due to decreased particle size, or from inter-layer water associated with highly disordered structure of the kaolinite. Also, the presence of amorphous material increases the size of this peak.
The low intensity of the thermal reaction at the main endothermic peak (540-597°C) may be attributed to the poor crystallinity of the clay minerals and the presence of quartz. Disappearance of the exothermic peak of kaolinite at about 980°C may be due to the disordering in the lattice of kaolinite and the presence of a large amount of calcite. Both illite and chlorite which were recorded by the X-ray analysis were not detected in the d.t.a, curves. Mixed-layer illitemontmorillonite detected confirmed the X-ray data. This technique also identified abnormal montmorillonite which was not revealed by the X-ray examination.