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Particle size separation and evidence for pedogenesis in samples from the Chinese Loess Plateau spanning the past 22 m.y.

文献类型：期刊论文

作者Hao, Qingzhen1,2; Oldfield, Frank2; Bloemendal, Jan2; Guo, Zhengtang1
刊名GEOLOGY
出版日期2008-09-01
卷号36期号:9页码:727-730
关键词loess pedogenesis granulometry pipette analysis magnetic properties
ISSN号0091-7613
DOI10.1130/G24940A.1
文献子类Article
英文摘要A comparison between particle size distributions determined by laser diffraction and the pipette method confirms previous studies that point to a variable underestimate of the clay fraction using laser diffraction, relative to the values obtained by pipette analysis. In order to yield four particle-sized fractions (<2 mu m, 2-4 mu m, 4-8 mu m, >8 mu m) for further analysis, the pipette method was used on loess and paleosol samples from sites on the Chinese Loess Plateau spanning the past 22 m.y. In all cases, a subsidiary mode in the <2 mu m fraction is identified. The clear separation of this from the coarse mode in the >8 mu m fraction provides a basis for evaluating the relative contributions of pedogenic and detrital components. Pretreatment using acetic rather than hydrochloric acid for carbonate removal results in no significant loss of ferrimagnetic minerals and allows magnetic characterization of the separate fractions. This confirms the isolation of almost all the finest, pedogenic ferrimagnetic grains in the clay fraction and their negligible contribution to the magnetic properties of the coarse fractions in all the samples from early Miocene time onward. Because similar conclusions may be drawn from previous studies of late Pleistocene samples from the east-central and extreme western parts of the Chinese Loess Plateau, we conclude that this approach provides a basis for separately characterizing eolian deposition and pedogenesis throughout the region and for the whole time span of loess accumulation.
WOS关键词LASER-DIFFRACTION ; GRAIN-SIZE ; MAGNETIC-PROPERTIES ; PIPETTE-METHOD ; TIME-SCALE ; SEDIMENTS ; ANALYZER ; DEPOSITS ; RECORD ; CYCLE
WOS研究方向Geology
语种英语
WOS记录号WOS:000258943400014
出版者GEOLOGICAL SOC AMER, INC
资助机构Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40672115 ; National Natural Science Foundation of China(40672115 ; Royal Society ; Royal Society ; (2004CB720203) ; (2004CB720203) ; 40730104) ; 40730104) ; Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40672115 ; National Natural Science Foundation of China(40672115 ; Royal Society ; Royal Society ; (2004CB720203) ; (2004CB720203) ; 40730104) ; 40730104) ; Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40672115 ; National Natural Science Foundation of China(40672115 ; Royal Society ; Royal Society ; (2004CB720203) ; (2004CB720203) ; 40730104) ; 40730104) ; Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40672115 ; National Natural Science Foundation of China(40672115 ; Royal Society ; Royal Society ; (2004CB720203) ; (2004CB720203) ; 40730104) ; 40730104)
源URL[http://ir.iggcas.ac.cn/handle/132A11/69091]  
专题中国科学院地质与地球物理研究所
通讯作者Hao, Qingzhen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Univ Liverpool, Dept Geog, Liverpool L69 7ZT, Merseyside, England
推荐引用方式
GB/T 7714		 Hao, Qingzhen,Oldfield, Frank,Bloemendal, Jan,et al. Particle size separation and evidence for pedogenesis in samples from the Chinese Loess Plateau spanning the past 22 m.y.[J]. GEOLOGY,2008,36(9):727-730.
APA Hao, Qingzhen,Oldfield, Frank,Bloemendal, Jan,&Guo, Zhengtang.(2008).Particle size separation and evidence for pedogenesis in samples from the Chinese Loess Plateau spanning the past 22 m.y..GEOLOGY,36(9),727-730.
MLA Hao, Qingzhen,et al."Particle size separation and evidence for pedogenesis in samples from the Chinese Loess Plateau spanning the past 22 m.y.".GEOLOGY 36.9(2008):727-730.

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来源：地质与地球物理研究所

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