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"Iron Mineral Modifications in the Sand Fraction of A Subtropical Soil from Argentina"
A. Mijovilovich, H. Causevic, H. Morrás and C. Saragovi
Proc. of the "26th International Conference on Applications of the Mössbauer Effect" (ICAME 2001), Oxford, United Kingdom, September 2-7, 2001. Ed. M.F. Thomas, J.M. Williams and T.C. Gibb
Hyperfine Interactions (C), Vol.5, Kluwer Academic Publishers (2002) 439-442
ISBN: 1-4020-1087-7
The sand fraction of a Bt22 horizon (105-155 cm depth) of a clayey red Ultisol in a subtropical forest environment (Misiones, Argentina) was studied by X-ray diffraction (XRD), saturation magnetization (ss) optical microscopy (OM) and Mössbauer spectroscopy (MS). Saturation magnetization for the whole sand fraction (wsf), the non magnetic (nmsf) and the magnetic fractions (msf) gave ss values of 10.79 JT-1Kg-1, 16.92 JT-1Kg-1 and 1.50 JT-1Kg-1 respectively. Mainly quartz, ilmenite, Al-substituted hematite, magnetite together with maghemite contribution and goethite were found. Magnetite/maghemite contents are high, being magnetite predominant in the msf. Results are compared with those from the upper B1 horizon (10-35cm depth) of the same soil, in which a lower wsf ss value and higher values of msf ss and of (ss (msf)-ss(wsf)) values were measured. These results confirm the stability of magnetite in this soil contrasting with other results on soils from neighbouring areas.
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