Variation of soil magnetism across the Russian steppe: its significance for use of soil magnetism as a palaeorainfall proxy

Maher, Barbara A.; Alekseev, A. O.; Alekseeva, Tatiana

doi:10.1016/s0277-3791(02)00022-7

Cited by 135 publications

(80 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fig. 1), a climatically determined equilibrium magnetic value may be reached due to feedback between formation of ferrimagnets and their subsequent loss by oxidation or dissolution (Maher, 1998;Maher et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Magnetic susceptibility, M ARM and IRM data have been outlined elsewhere (Maher et al, 2002). Brie£y, all the soils display higher magnetic susceptibility values in their A and B horizons than their C horizons (Fig.…”

Section: Magnetic Measurementsmentioning

confidence: 90%

“…The soil magnetism/climate relationship was tested recently in a geographically independent, pollution-free and geomorphologically stable region, the Russian steppe (Maher et al, 2002). In contrast to the Chinese Loess Plateau region, minimal dust accumulation occurs across this region at the present day.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic mineralogy of soils across the Russian Steppe: climatic dependence of pedogenic magnetite formation

Maher

Alekseev

Alekseeva

2003

Palaeogeography, Palaeoclimatology, Palaeoecology

187

View full text Add to dashboard Cite

Formation of ferrimagnets in well-drained, buffered, unpolluted soils appears to be related to climate, and especially rainfall. If robust, this magnetism/rainfall couple can be used to estimate past rainfall from buried soils, particularly the multiple soils of the Quaternary loess/soil sequences of Central Asia. However, dispute exists regarding the role of climate vs. dust flux for the magnetic properties of modern loessic soils. Here, we examine the mineralogical basis of the magnetism/rainfall link for a climate transect across the loess-mantled Russian steppe, where, critically, dust accumulation is minimal at the present day. Magnetic and independent mineralogical analyses identify in situ formation of ferrimagnets in these grassland soils; increased ferrimagnetic concentrations are associated with higher annual rainfall. XRD and electron microscopy show the soil-formed ferrimagnets are ultrafinegrained ( 6 V50 nm) and pure. Ferrimagnetic contributions to Mo « ssbauer spectra range from 17% in the parent loess to 42% for a subsoil sample from the highest rainfall area. Total iron content varies little but the systematic magnetic increases are accompanied by decreased Fe 2þ content, reflecting increased silicate weathering. For this region, parent materials are loessial deposits, topography is rolling to flat and duration of soil formation effectively constant. The variations in soil magnetic properties thus predominantly reflect climate (and its co-variant, organic activity)ŝ tatistical analysis identifies strongest relationships between rainfall and magnetic susceptibility and anhysteretic remanence. This magnetic response correlates with that of the modern soils across the Chinese Loess Plateau. Such correlation suggests that the rainfall component of the climate system, not dust flux, is a key influence on soil magnetic properties in both these regions. ß

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Magnetic Measurementsmentioning

confidence: 90%

See 1 more Smart Citation

Magnetic mineralogy of soils across the Russian Steppe: climatic dependence of pedogenic magnetite formation

Maher

Alekseev

Alekseeva

2003

Palaeogeography, Palaeoclimatology, Palaeoecology

187

View full text Add to dashboard Cite

show abstract

“…The magnetic properties of soils proved to be suitable parameters, as they reflect the various degrees of contamination due to human activities and allow us to detect the area most affected by pollution. The measurement of magnetic properties in samples taken in soil profiles enables: 1) acquisition of information about the boundary depth between polluted soil and clean soil (Blaha et al, 2008), 2) discrimination between anthropogenic and lithogenic contributions (Fialová et al, 2006;Magiera et al, 2006), 3) discovery of the underlying parent material's influence on the magnetic signal (Hanesch and Scholger, 2005), 4) understanding of the development of pedogenic processes (Jordanova et al, 2010;Maher et al, 2002) and 5) attainment of climate reconstructions (Alekseeva et al, 2007;Maher et al, 2002). In the present study, data from 6 soil profiles, which formed on diverse parent material and in different environments (rural/urban), are analysed.…”

Section: Introductionmentioning

confidence: 99%

Magnetic, geochemical and pedological characterisation of soil profiles from different environments and geological backgrounds near Coimbra, Portugal

et al. 2014

View full text Add to dashboard Cite

This study presents an application of environmental magnetism techniques for the characterisation of the soils near Coimbra (central Portugal). Magnetic measurements, scanning electron microscopy and geochemical studies were carried out on samples collected in 6 soil profiles in order to find possible relationships and to interpret environmental implications. Magnetic susceptibility, saturation isothermal remanent magnetisation and isothermal remanent magnetisation at the backfield of 100 mT and 300 mT were measured. HardIRM %, SIRM/χ and S-ratios were also calculated. Polluted soils showed higher values of magnetic parameters in the superficial soil horizons closer to the roads, plants and urban areas. The lowest values were observed in the deeper horizons of the soil and in the areas least disturbed by human activity. The magnetic results also suggested that the magnetic signal of these soils is mainly influenced by ferrimagnetic magnetite-like minerals and with only a minor contribution from antiferromagnetic carriers (such as hematite minerals). In unpolluted soils, lithogenic contribution is reflected by the enhancement of magnetic susceptibility near parental rock material. Scanning electron microscope images of the topsoil samples revealed the presence of magnetic spherules typical of vehicular exhaust and combustion processes. This evidence suggests that the atmospheric deposition of fly ash is the main reason for the enhancement of the magnetic signal in the topsoil. Chemical analyses showed that the concentration of various heavy metals was higher than the mean background values for Portuguese soils, and higher in superficial soils. Heavy metals showed significant positive correlation with magnetic properties. The conclusions highlight the importance of using environmental magnetism methods and techniques in the evaluation process of soil evolution and pollution history throughout time.

show abstract

“…are closely related with soil forming factors during pedogenesis, especially precipitation. Magnetic parameters, which are fast, inexpensive, non-destructive, and sensitive, have been commonly used as indicators of paleoprecipitation for decades, especially the mass-specific susceptibility (χ) (Balsam et al, 2004;Balsam et al, 2011;Liu et al, 2007;Liu et al, 2012;Maher, 1998;Maher et al, 2002;Maher and Possolo, 2013;Maher et al, 1994;Orgeira and Compagnucci, 2006). Maher and Thompson (1995) reported that pedogenic χ (defined as χ-χ C , where χ C represents the χ of the parent material) rises to a peak until MAP reaches about to reductive dissolution or alteration of the iron oxides.…”

Section: Introductionmentioning

confidence: 99%

Quantifying paleoprecipitation of the Luochuan and Sanmenxia Loess on the Chinese Loess Plateau

Liu

Wei

Wang

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

Variation of soil magnetism across the Russian steppe: its significance for use of soil magnetism as a palaeorainfall proxy

Cited by 135 publications

References 14 publications

Magnetic mineralogy of soils across the Russian Steppe: climatic dependence of pedogenic magnetite formation

Magnetic mineralogy of soils across the Russian Steppe: climatic dependence of pedogenic magnetite formation

Magnetic, geochemical and pedological characterisation of soil profiles from different environments and geological backgrounds near Coimbra, Portugal

Quantifying paleoprecipitation of the Luochuan and Sanmenxia Loess on the Chinese Loess Plateau

Contact Info

Product

Resources

About