Abstract
Clay minerals from different Cretaceous stratigraphic successions of Egypt were investigated using XRD, DTA, dissolution analysis (DCB), IR, Mössbauer and X-ray Electron Spin Resonance (ESR) spectroscopes. The purity of the samples and the degree of their structural order were determined by XRD. The location of Fe in the octahedral sheet is characterized by absorption bands at ∼875cm−1 assigned as Al-OH-Fe which persist after chemical dissolution of free iron. The Mössbauer spectra of these clays show two doublets with isomer shift and quadrupole splitting typical of octahedrally coordinated Fe3+, in addition to third doublet with hyperfine parameter typical of Fe2+ in the spectra of Abu-Had kaolinite (H) sample. Six-lines magnetic hyperfine components which are consistent with those of hematite are confirmed in the spectra of both Isel and Rish kaolinite samples. Goethite was confirmed by both IR and DTA. Multiple nature of ESR of these clays suggested structural Fe in distorted octahedral symmetry as well as non-structural Fe.
Little dispersion and low swelling indices as well as incomplete activation of the investigated montmorillonite samples by NaCO3 appear to be due to incomplete disaggregation of montmorillonite particles. This can be explained by the ability of Fe-gel to aggregate the montmorillonite into pseudo-particles and retard the rigid-gel structure. However, extraction of this ferric amorphous compound by dithonite treatment recovers the surface properties of the montmorillonite samples.
On the other hand, the amount and site occupation of Fe associated with kaolinite samples show an inverse correlation with the parameters used to describe the degree of crystallinity perfection, color, brightness and vitrification range of these kaolinite samples.
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References
Bahranowski, E., L. Serwicka Stoch, and P. Strycharski, 1993, On the possibility of removal of non-structural iron from kaolinite-group minerals: Clays and clay minerals, v. 28, p. 379–391.
Blakmore, A., 1973, Aggregation of clay by the products of iron (III) hydrolysis: Aust. J. Soil Res., v. 11, p. 75–82.
Buatier, M., K. Ouyang, and J. Sanchez, 1993, Iron in hydrothermal clays from the Galapagos spreading center mounds: consequences for the clay transition mechanism: Clay Minerals, v. 28, p. 641–655.
Childs, C., B. Goodman, and G. Churhman, 1987, Application of Mössbauer spectroscopy to the study of oxides in some red and yellow/brown soil samples from New Zealand: Devel. in sedi No.27, Inter. Clay Conf.
Coey, J., 1980, Clay minerals and their transformation studies with nuclear techniques: Energy Rev., v. 18, p. 73–123.
El-Kholi, M., A. Meshrif, S. Abu Laban, and M. Serry, 1994, Application of Aswan clays for the production of acid resistant engineering bricks: Min. Soc. of Egypt, Int. Symp. On Ind. Appli. of Clay, Egypt.
Farmer, V., J. Russell, J. Ahlrichs, and B. Velde, 1967, Bull. Gr. Argues, v. 19, p. 5.
Goodman, B., J. Russell, H. Fraser, and F. Woodhams, 1978, A Mössbauer and IR spectroscopic study of the structure of montmorillonite: Clays and Clay Minerals, v. 24, p. 53–59.
Grman, D., M. Pisár, and V. Novák, 1973, Silikśty, v. 17, p. 55.
Heller-Kallai, C. and L. Rozenson, 1981, The use of Mössbauer spectroscopy of iron in clay mineralogy: Phys. Chem. Minerals, v. 7, p. 223–238.
Heller, L., V. Farmer, R. Mackenzie, B. Mitchell, and H. Taylor, 1962, Clay Minerals: Bull., v. 5, p. 56.
Hinckley, D., 1963, Variability in crystallinity values among the kaolin deposits of the coastal plain of Georgia and South Carolina: Clays and Clay Minerals, II, p. 229–235.
Kinniburgh, D., J. Syers, and M. Jakson, 1975, Specific adsorption of trace amounts of calcium and strontium by hydrous oxides of iron and aluminum: Soil Soc. Am. J., v. 39, p. 464–470.
McBride, M., T. Pinnavaia, and M. Mortland, 1975, Perturbation of structural Fe3+ in smectites by exchange ions: Clays and Clay Minerals, v. 23, p. 103–108.
Mehra, O. and M. Jackson, 1960, Iron oxide removal from soils and clays by dithonite-citrate system buffered with sodium bicarbonate: Clays and Clay Minerals, v. 7, p. 317–327.
Mestdagh, M., L. Vielvoye, and A. Herbillon, 1980, Iron in kaolinite, II. the relationship between crystallinity and iron content: Clay Minerals, v. 15, p. 1–13.
Mendelovici, E., S. Yariv, and R. Villalba, 1979, Iron-bearing kaolinite in Venezuelan laterites: Clays and Clay Minerals, p. 323–331.
Michalet, B., Guillet, and B. Souchier, 1993, Hematite identification in pseudo-particles of Moroccan Rubified soils: Clay Minerals, v. 28, p. 233–242.
Muard, E. and U. Wagner, 1994, The Mössbauer spectra of illite and their firing products: Clay Minerals, v. 29, p. 1–10.
Pedro, G., A. Chauvel, and J. Melfi, 1976, Recherches sur la constitution et la genese des Terra Rossa Estructurada du Bresil: Ann Argon, v. 27, p. 265–294.
Robet, M., J. Berrier, G. Veneau, and M. Vincente, 1981, Action of amorphous compounds on clay particle associations: Proc. 7th Int. Clay Conf., Bologna-Pavia, p. 411–423.
Rozenson, I. And L. Heller-Kallai, 1977, Mössbauer spectra of dioctahedral smectite: Clays and Clay Minerals, v. 25, p. 94–101.
Shaikum, N. and R. Carr, 1987, Electron spin resonance studies of halloysites: Clays and Clay Minerals, v. 22, p. 287–296.
Stuki, J. and C. Roth, 1976, Clays and Clay Minerals: v. 24, p. 293.
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Hassan, M.S., Salem, S.M. Distribution and influence of iron phases on the physico-chemical properties of phyllosilicates. Chin. J. of Geochem. 20, 120–129 (2001). https://doi.org/10.1007/BF03165993
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DOI: https://doi.org/10.1007/BF03165993