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DOI	10.1002/2014GC005616
	Bulk particle size distribution and magnetic properties of particle-sized fractions from loess and paleosol samples in Central Asia
	Zan, Jinbo; Fang, Xiaomin; Yang, Shengli; Yan, Maodu
通讯作者	Fang, XM (通讯作者)
发表日期	2015
ISSN	1525-2027
起始页码	101
结束页码	111
卷号	16 期号:1
英文摘要	Recent studies demonstrate that particle size separation based on gravitational settling and detailed rock magnetic measurements of the resulting fractionated samples constitutes an effective approach to evaluating the relative contributions of pedogenic and detrital components in the loess and paleosol sequences on the Chinese Loess Plateau. So far, however, similar work has not been undertaken on the loess deposits in Central Asia. In this paper, 17 loess and paleosol samples from three representative loess sections in Central Asia were separated into four grain size fractions, and then systematic rock magnetic measurements were made on the fractions. Our results demonstrate that the content of the <4 mu m fraction in the Central Asian loess deposits is relatively low and that the samples generally have a unimodal particle distribution with a peak in the medium-coarse silt range. We find no significant difference between the particle size distributions obtained by the laser diffraction and the pipette and wet sieving methods. Rock magnetic studies further demonstrate that the medium-coarse silt fraction (e.g., the 20-75 mu m fraction) provides the main control on the magnetic properties of the loess and paleosol samples in Central Asia. The contribution of pedogenically produced superparamagnetic (SP) and stable single-domain (SD) magnetic particles to the bulk magnetic properties is very limited. In addition, the coarsest fraction (>75 mu m) exhibits the minimum values of chi, chi(ARM), and SIRM, demonstrating that the concentrations of ferrimagnetic grains are not positively correlated with the bulk particle size in the Central Asian loess deposits.
关键词	CHINESE LOESS LOESS/PALAEOSOL SEQUENCE REMANENCE CURVES GRAIN-SIZE SUSCEPTIBILITY PLATEAU PEDOGENESIS PALEOCLIMATE COMPONENTS SEPARATION
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000349839000006
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258470
推荐引用方式 GB/T 7714	Zan, Jinbo,Fang, Xiaomin,Yang, Shengli,et al. Bulk particle size distribution and magnetic properties of particle-sized fractions from loess and paleosol samples in Central Asia[J]. 中国科学院青藏高原研究所,2015,16(1).
APA	Zan, Jinbo,Fang, Xiaomin,Yang, Shengli,&Yan, Maodu.(2015).Bulk particle size distribution and magnetic properties of particle-sized fractions from loess and paleosol samples in Central Asia.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,16(1).
MLA	Zan, Jinbo,et al."Bulk particle size distribution and magnetic properties of particle-sized fractions from loess and paleosol samples in Central Asia".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 16.1(2015).