DOI: 10.1016/j.gloplacha.2013.04.012
论文题名: Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography
作者: Nie J. ; Jackson M. ; King J. ; Fang X.
刊名: Global and Planetary Change
ISSN: 0921-8216
出版年: 2013
卷: 110 起始页码: 364
结束页码: 367
语种: 英语
英文关键词: Loess plateau
; Red-clay
; Rock magnetism
Scopus关键词: Chinese Loess Plateau
; East Asian summer monsoon
; Enhancement mechanism
; Grain-size distribution
; Loess Plateau
; Red-clay
; Rock magnetism
; Superparamagnetic grains
; Grain size and shape
; Landforms
; Magnetic susceptibility
; Size distribution
; Superparamagnetism
; Tomography
; Sediments
; clay
; frequency analysis
; grain size
; magnetization
; paleomagnetism
; paleosol
; pedogenesis
; proxy climate record
; Quaternary
; size distribution
; temperature effect
; tomography
; Far East
英文摘要: Although magnetic susceptibility (χ) is a widely accepted East Asian summer monsoon (EASM) intensity proxy for Quaternary loess, debates exist about whether χ can be used to indicate EASM intensity for the red-clay sequence. In order to use χ of the red-clay sediments to indicate EASM intensity, χ 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 (χ) can be used to indicate the intensity of the EASM in the red-clay sequence. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888836870&doi=10.1016%2fj.gloplacha.2013.04.012&partnerID=40&md5=a14070c05376ed626ab554ca9dd6685c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11122
Appears in Collections: 全球变化的国际研究计划
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作者单位: Key Laboratory of Western China's Environmental System, Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China
Recommended Citation:
Nie J.,Jackson M.,King J.,et al. Characterizing the superparamagnetic grain distribution of Chinese red-clay sequences by thermal fluctuation tomography[J]. Global and Planetary Change,2013-01-01,110.