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Mineralogy of a burned soil compared with four anomalously red Quaternary deposits in Denmark

¹ Department of Earth Sciences, University of Aarhus, DK-8000 Aarhus C, Denmark, ² Lehrstuhl für Bodenkunde, Technische Universität München, D-85350 Freising-Weihenstephan, Germany, ³ Institut für Mineralogie und Lagerstättenlehre, RWTH, D-52056 Aachen, Germany, and ⁴ Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark

View larger version (25K): [in a new window]   FIG. 1. Map showing the geographical positions of Fe oxide sites.

View larger version (15K): [in a new window]   FIG. 2. CIE-colour determinations. The diagram shows the natural samples compared with sectors of pure laboratory goethite and hematite. Sample designations are given in Table 2.

View larger version (33K): [in a new window]   FIG. 3. XRD patterns of <63 µm samples from Naesset Bs1 (Fed: 10.2%), Bs2 (Fed: 17.7%) and Bs3 (Fed: 5.76%) horizons.

View larger version (32K): [in a new window]   FIG. 4. XRD patterns of <63 µm samples I (Fed: 30.8%) and II (Fed: 50.4%) from Salten Skov.

View larger version (32K): [in a new window]   FIG. 5. Mössbauer spectra of sample I from Salten Skov. Solid lines show individual fitting of components and their sum.

View larger version (30K): [in a new window]   FIG. 6. XRD patterns of <63 µm samples I (Fed: 25.2%) and II (Fed: 13.7%) from Salten.

View larger version (30K): [in a new window]   FIG. 7. XRD patterns of <63 µm samples I (Fed: 40.7%), II (Fed: 39.6%) and III (Fed: 42.6%) from Pot Molle.

View larger version (26K): [in a new window]   FIG. 8. Mössbauer spectra of sample I from Pot Molle. Solid lines show individual fitting of components and their sum. The inset figure shows the RT spectrum scaled to show the sextet component.

View larger version (27K): [in a new window]   FIG. 9. XRD patterns of <63 µm samples I (Fed: 40.0%) and II (Fed: 50.9%) from Laasby

View larger version (145K): [in a new window]   FIG. 10. TEM image of the edge of a particle from Salten Skov I.

View larger version (196K): [in a new window]   FIG. 11. TEM image of part of a particle from Pot Molle I.