气候变化领域集成服务门户(CCPortal): Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography

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DOI	10.1016/j.gloplacha.2013.04.012
	Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography
	Nie, Junsheng; Jackson, Mike; King, John; Fang, Xiaomin
通讯作者	Nie, JS (通讯作者)
发表日期	2013
ISSN	0921-8181
EISSN	1872-6364
起始页码	364
结束页码	367
卷号	110
英文摘要	Although magnetic susceptibility (chi) is a widely accepted East Asian summer monsoon (EASM) intensity proxy for Quaternary loess, debates exist about whether chi can be used to indicate EASM intensity for the red-clay sequence. In order to use chi of the red-clay sediments to indicate EASM intensity, chi should have the same sort of enhancement mechanisms as in Quaternary loess. However, this similarity has not been rigorously demonstrated. Previous estimates of magnetic grain size distribution of Chinese loess and red-clay are based on out-of-phase magnetic susceptibility inversion technique. This technique assumes that the coercivity of pedogenic magnetic grains is independent of temperature, and at any temperature, only a single grain size contributes to frequency-dependent or quadrature susceptibility, rather than a distribution of sizes. Thermal fluctuation tomography is a recently developed more rigorous inversion technique for characterizing the grain-size distribution of superparamagnetic (SP) and single domain grains with fewer assumptions. Here we apply this technique to the Chinese red-clay sequence of the Chaona section, central Chinese Loess Plateau, and the overlying loess-paleosol sequence to better characterize the size distribution of SP grains of the Chinese red-clay sequence. We found that SP grain-size distributions of both paleosol and red-clay from the Chaona section are similar. The results reinforce a previous conclusion supporting the idea that magnetic susceptibility (chi) can be used to indicate the intensity of the EASM in the red-clay sequence. (C) 2013 Elsevier B.V. All rights reserved.
关键词	MAGNETIC-SUSCEPTIBILITY FREQUENCY-DEPENDENCE TIBETAN PLATEAU LOESS UPLIFT EVOLUTION MA
英文关键词	loess plateau; red-clay; rock magnetism
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000329333400009
来源期刊	GLOBAL AND PLANETARY CHANGE
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/258210
推荐引用方式 GB/T 7714	Nie, Junsheng,Jackson, Mike,King, John,et al. Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography[J]. 中国科学院青藏高原研究所,2013,110.
APA	Nie, Junsheng,Jackson, Mike,King, John,&Fang, Xiaomin.(2013).Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography.GLOBAL AND PLANETARY CHANGE,110.
MLA	Nie, Junsheng,et al."Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography".GLOBAL AND PLANETARY CHANGE 110(2013).