Characterizing and quantifying iron oxides in Chinese loess/paleosols: Implications for pedogenesis

Hu, Pengxiang; Liu, Qingsong; Torrent, J.; Barrón, Vidal; Jin, Chunsheng

doi:10.1016/j.epsl.2013.03.033

Cited by 101 publications

(75 citation statements)

References 95 publications

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“…The P 535 nm group is mainly present in paleosols and can be preferentially dissolved by CBD treatment (Hu et al 2013). Therefore, this component is interpreted as due to hematite pigments that formed via pedogenesis and that the Al content is relatively higher than for the other two groups.…”

Section: Clp-sourcesmentioning

confidence: 99%

“…The blue ellipsoid indicates the properties of Chinese loess with minimal pedogenic alteration (Liu et al 2003(Liu et al , 2004a. regions and loess/paleosol samples from the CLP (Hu et al 2013), hematite particles in the studied natural materials can be classified into three groups: P 560 nm , P 545 nm , and P 535 nm . The P 560 nm component is present only in some samples from the source regions, e.g., XZ, TK, and MG (Figure 8).…”

Section: Magnetic Mineral Assemblagesmentioning

confidence: 99%

“…Therefore, the P 560 nm group is more pure and should correspond to lithogenic hematite that originates from physical disintegration of surrounding bedrock. Lithogenic hematite is expected to be poor in Al, and is resistant to citratebicarbonate-dithionite (CBD) dissolution due to its relatively coarser grain size (Hu et al 2013).…”

Section: Magnetic Mineral Assemblagesmentioning

confidence: 99%

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Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism

et al. 2015

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Eolian dust plays an important role in the Earth's climate system. Environmental magnetism has been widely used to trace dust variations at different spatial and temporal scales. However, the magnetic properties of sediments from key dust sources have not been well determined. In this study, surface samples from potential dust sources in inner Eastern Asia were systematically investigated. Our results indicate that ferrimagnetic and antiferromagnetic minerals are both present in surface sediments and that they have broad grain size distributions. Ferrimagnetic components are dominated by partially oxidized coarse-grained (pseudo-single domain and multi-domain) lithogenic magnetite particles with minor contributions from pedogenic fine-grained (single domain and superparamagnetic) particles. Antiferromagnetic hematite can be classified into three groups in terms of diffuse reflectance spectroscopy (DRS) band positions (P 560 nm , P 545 nm , and P 535 nm , where numbers indicate the DRS band wavelength for hematite). The first group (P 560 nm ) is the coarse-grained hematite of lithogenic origin and is mostly confined to western China. The P 535 nm group is of pedogenic origin. The P 545 nm group is an intermediate phase that is present both in surface samples from the source regions and in loess. Therefore, the P 545 nm and P 535 nm groups are related to eolian inputs to the Chinese Loess Plateau and pedogenic processes, respectively. In addition, significant differences exist between the magnetic properties of eolian material from sources and depositional regions due to gravitational sorting. These insights provide strong constraints on interpretation of dust signals recorded by the Chinese loess and marine sediments from the North Pacific Ocean.

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Section: Clp-sourcesmentioning

confidence: 99%

Section: Magnetic Mineral Assemblagesmentioning

confidence: 99%

Section: Magnetic Mineral Assemblagesmentioning

confidence: 99%

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Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism

et al. 2015

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“…Teniendo en cuenta los resultados de varias investigaciones sobre pedogénesis (Mehra & Jackson, 1960;Wada, 1989;Dahlgren et al, 1993;García et al, 2004;Pansu & Gautheyrou et al, 2006;Zapata, 2006;Jansen et al, 2011;Hu et al, 2013) y las metodologías propuestas por Dai et al (2011) y Asano & Wagai (2014 puede afirmarse que cuando las extracciones selectivas se realizan de manera secuencial el cloruro de potasio permite obtener el Al, Fe y Si intercambiables, con el pirofosfato de sodio se obtienen el Al, Fe y Si presentes en los complejos organometálicos, el oxalato ácido de amonio extrae el Al, Fe y Si que hacen parte de los aluminosilicatos no cristalinos (alofana, imogolita) y de los óxidos e hidróxidos no cristalinos como la ferrihidrita, el ditionito-citrato-bicarbonato se utiliza para disolver los óxidos e hidróxidos de Fe cristalinos (magnetita, hematita y goethita) y el hidróxido de sodio genera la disolución de los óxidos e hidróxidos de Al cristalinos (gibsita), de las arcillas silicatadas 1:1 con bajo grado de ordenamiento y de los ópalos y fitolitos.…”

Section: Marco Teóricounclassified

Extracciones selectivas y secuenciales de Al, Fe y Si en un Andisol del Oriente antioqueño, Colombia

et al. 2018

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Se estudió la extracción selectiva y secuencial de las fracciones de Al, Fe y Si (cloruro de potasio, pirofosfato de sodio, oxalato ácido de amonio, ditionito-citrato-bicarbonato e hidróxido de sodio) de un Andisol del Oriente antioqueño con fines genéticos, lo cual, permitió separar horizontes alofánicos y no alofánicos. En los horizontes A y 2B/A la fracción coloidal estuvo dominada por complejos organometálicos, mientras que en los horizontes 3C/A y 4Bs predominaron los aluminosilicatos y los óxidos e hidróxidos no cristalinos. Este método también logró diferenciar dentro del horizonte A, por lo menos, dos subhorizontes no visualizados en campo. Los bajos contenidos de Ald, Fed y Sid y de Aln y Fen reportados pueden deberse a las extracciones previas realizadas con pirofosfato de sodio y oxalato ácido de amonio, en las que se liberó la mayor proporción del Al, Fe y Si y a las bajas cantidades de coloides inorgánicos cristalinos que presentan los Andisoles.

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“…The postdepositional effects of weathering (Liang et al, 2009) and pedogenesis generate variations in the composition of loess stratigraphic sequences, and these variations have been used as a proxy to reconstruct regional paleoclimates (Sun, 2005;Jeong et al, 2008;Sun et al, 2008;Hu et al, 2013;Wimpenny et al, 2014) and past atmospheric circulations (Gallet et al, 1996). In recent decades, many studies have suggested that the dominant sources of loess on the CLP are gobi and sandy deserts (Torii et al, 2001;Sun, 2002), deflation pans , and piedmont alluvial fans (Derbyshire et al, 1998;Wang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Geochemical evidence for seasonal variations in potential loess sources of the western Chinese Loess Plateau

Wang

Lang

et al. 2015

Atmospheric Environment

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Characterizing and quantifying iron oxides in Chinese loess/paleosols: Implications for pedogenesis

Cited by 101 publications

References 95 publications

Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism

Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism

Extracciones selectivas y secuenciales de Al, Fe y Si en un Andisol del Oriente antioqueño, Colombia

Geochemical evidence for seasonal variations in potential loess sources of the western Chinese Loess Plateau

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