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Magnetic Enhancement and Iron Oxides in the Upper Luochuan Loess–Paleosol Sequence, Chinese Loess Plateau

^a Departamento de Ciencias y Recursos Agrícolas y Forestales, Universidad de Córdoba, Edificio C4, Campus de Rabanales, 14071 Córdoba, Spain
^b School of Ocean and Earth Science, National Oceanography Centre, Univ. of Southampton, European Way, Southampton SO14 3ZH, UK
^c Dep. of Geography, Roxby Building, Univ. of Liverpool, Liverpool L69 7ZT, UK

View larger version (59K): [in this window] [in a new window]   Fig. 1. Distribution of the Chinese Loess Plateau and site location.

View larger version (25K): [in this window] [in a new window]   Fig. 2. Depth plots of (a) low-frequency magnetic susceptibility, LF; (b) frequency-dependent magnetic susceptibility, FD; (c) anhysteretic remanent magnetization susceptibility, ARM; (d) hematite concentration; (e) goethite concentration; and (f) dithionite-extractable Fe/total Fe ratio (Fed/Fet). Gray bars and S notations denote the paleosols and L notations the loess units.

View larger version (15K): [in this window] [in a new window]   Fig. 3. Plots of (a) frequency-dependent magnetic susceptibility, FD, against low-frequency magnetic susceptibility, LF, and (b) anhysteretic remanent magnetization, ARM, against FD. The x axis intercept and y axis intercept of the regression lines in (a) and (b) are named o (0.2 x 10–6 m3 kg–1) and ARM,o (0.46 x 10–6 m3 kg–1), respectively, and are the estimates of FD and ARM contributed by aeolian inputs.

View larger version (25K): [in this window] [in a new window]   Fig. 4. Temperature dependence of frequency-dependent magnetic susceptibility, FD, for (a) samples of S5 (this study, central Chinese Loess Plateau [CLP]), and (b) samples of S1 from Yuanbao (western CLP) and Yichuan (eastern CLP) (Liu et al., 2005).

View larger version (15K): [in this window] [in a new window]   Fig. 5. Relationships between (a) the concentration of hematite and frequency-dependent magnetic susceptibility, FD; and (b) the concentration of goethite and FD.

View larger version (34K): [in this window] [in a new window]   Fig. 6. The ratio of carbonate-free pedogenic hematite, Hmcf, and goethite, Gtcf, concentrations, as Hmcf/(Hmcf + Gtcf), in the paleosol samples where dithionite-extractable Fe/total Fe >0.26.