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DOI	10.1093/gji/ggy209
	Comparison of hysteresis, thermomagnetic and low-temperature magnetic properties of particle-size fractions from loess and palaeosol samples in Central Asia and the Chinese Loess Plateau
	Zan, Jinbo; Fang, Xiaomin; Yan, Maodu; Shen, Miaomiao
通讯作者	Zan, JB (通讯作者)
发表日期	2018
ISSN	0956-540X
EISSN	1365-246X
起始页码	1608
结束页码	1622
卷号	214 期号:3
英文摘要	Hysteresis, thermomagnetic and low-temperature magnetic experiments on particle-size fractioned samples from the Chinese Loess Plateau (CLP) can be used to better characterize the magnetic mineralogy and magnetic granulometry of Chinese loess/palaeosols. However, a systematic study of the grain-size-dependent magnetic mineralogy of the Central Asian loess deposits has not been undertaken. In this paper, four size fractions of 17 loess and palaeosol samples from Central Asia and the CLP were subjected to aforementioned rock magnetic measurements. Our findings are as follows: (1) In Central Asia, the fractionated samples from loess and palaeosol couplets exhibit no obvious differences in their magnetic mineralogy due to weak pedogenesis. (2) Thermomagnetic analyses suggest that the content of maghemite in the clay fraction of palaeosols from the CLP is one or two orders of magnitude larger than that of the loess samples from the CLP and Central Asia. This result does not support the view that maghemite in the loess/palaeosol sequences of the CLP originated mainly from eolian sources. (3) Both hysteresis and low-temperature magnetic experiments demonstrate that detrital ferrimagnetic grains are mostly enriched in the 20-75 mu m fraction of loess/palaeosols from Central Asia and the CLP. The relative paucity of coarser magnetic grains in the > 75 mu m fractions indicates that a positive correlation does not always exist between the magnetic concentration parameters and the sedimentological particle size in Chinese loess deposits. (4) The regional variations in the magnetic properties of the 20-75 mu m fraction suggest that the supply of clastic sediments is the main control on the magnetic properties of loess deposits in Central Asia.
关键词	GRAIN-SIZE LOESS/PALAEOSOL SEQUENCE SUSCEPTIBILITY PEDOGENESIS DEPENDENCE DEPOSITS SEPARATION MAGHEMITE INSIGHTS SECTION
英文关键词	Environmental magnetism; Magnetic mineralogy and petrology; Rock and mineral magnetism
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000439648000006
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
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/259138
推荐引用方式 GB/T 7714	Zan, Jinbo,Fang, Xiaomin,Yan, Maodu,et al. Comparison of hysteresis, thermomagnetic and low-temperature magnetic properties of particle-size fractions from loess and palaeosol samples in Central Asia and the Chinese Loess Plateau[J]. 中国科学院青藏高原研究所,2018,214(3).
APA	Zan, Jinbo,Fang, Xiaomin,Yan, Maodu,&Shen, Miaomiao.(2018).Comparison of hysteresis, thermomagnetic and low-temperature magnetic properties of particle-size fractions from loess and palaeosol samples in Central Asia and the Chinese Loess Plateau.GEOPHYSICAL JOURNAL INTERNATIONAL,214(3).
MLA	Zan, Jinbo,et al."Comparison of hysteresis, thermomagnetic and low-temperature magnetic properties of particle-size fractions from loess and palaeosol samples in Central Asia and the Chinese Loess Plateau".GEOPHYSICAL JOURNAL INTERNATIONAL 214.3(2018).