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Quantifying grain size distribution of pedogenic magnetic particles in Chinese loess and its significance for pedogenesis

Liu, Qingsong, Torrent, José, Maher, Barbara A., Yu, Yongjae, Deng, Chenglong, Zhu, Rixiang and Zhao, Xixi (2005) Quantifying grain size distribution of pedogenic magnetic particles in Chinese loess and its significance for pedogenesis Journal of Geophysical Research, 110, (B11), B11102-[7pp]. (doi:10.1029/2005JB003726).

Record type: Article


Quaternary glacial/interglacial cycles have been imprinted on the Chinese loess/paleosol sequences through pedogenesis. In order to accurately decode the paleoclimatic signals carried by these pedogenic particles it is essential to quantify the pedogenically produced magnetic particles in terms of mineralogy as well as grain size distribution (GSD). To date, the GSD has not been accurately determined because of the dearth of available means for analyzing extremely fine grained (nanometer-scale) pedogenic magnetic particles. Using low-temperature techniques, we systematically investigated the temperature dependency of ?fd (defined as ?1Hz ? ?10Hz, where ?1Hz and ?10Hz are AC magnetic susceptibility measured at 1 and 10 Hz, respectively) from two characteristic loess profiles, one located at the western Chinese Loess Plateau and the other in the central plateau. On the basis of Néel theory for a shape anisotropy dominant grain and experimental analysis at low temperatures, a quantitative GSD for pedogenic particles in Chinese loess/paleosols was constructed. We found that the dominant magnetic grain size lies just above the superparamagnetic/single-domain threshold (~20–25 nm) and that the GSD is almost independent of the degree of pedogenesis. This observation agrees well with other constraints from previous studies. This new GSD model improves our understanding of the pedogenic processes in Chinese loess, enabling further explicit linkage of environmental magnetism to paleoclimate changes.

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Published date: November 2005
Keywords: chinese loess, grain size distribution, pedogenesis


Local EPrints ID: 41264
ISSN: 0148-0227
PURE UUID: cf5fc2c0-1733-45da-bdd7-47aeb88f923c

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Date deposited: 11 Aug 2006
Last modified: 17 Jul 2017 15:31

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Author: Qingsong Liu
Author: José Torrent
Author: Barbara A. Maher
Author: Yongjae Yu
Author: Chenglong Deng
Author: Rixiang Zhu
Author: Xixi Zhao

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