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Quantifying ultrafine pedogenic magnetic particles in Chinese loess by monitoring viscous decay of superparamagnetism

文献类型：期刊论文

作者Wang, Xisheng1; Lovlie, Reidar2; Zhao, Xiangyu3; Yang, Zhenyu4; Jiang, Fuchu1; Wang, Shubing1
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
出版日期2010-10-13
卷号11
关键词Relaxometry Superparamagnetism Frequency-dependent Susceptibility Pedogenic Ferromagnetic Grains Chinese Loess
ISSN号1525-2027
DOI10.1029/2010GC003194
文献子类Article
英文摘要We propose a new approach for quantifying pedogenically produced ultrafine (nanometer-scale) magnetic particles in Chinese loess. We have recorded the viscous decay (Delta t = 100 s) of imposed isothermal remanent magnetization (IRM) assumed to be selectively carried by superparamagnetic particles (J(v)). Application of viscosity measurements (relaxometry) to loess-paleosol sequences from the SE extremity of the Chinese Loess Plateau reveals that J(v) aptly reflects contributions of viscous superparamagnetic (SP) particles to the total remanence carried by an assemblage of magnetic particles. Time decay of J(v) can be determined with a higher resolution than the conventionally used frequency-dependent susceptibility (chi(fd)%) for characterizing the relative abundance of SP particles. The nearly logarithmic time decay of IRM implies a rather broad grain size distribution of pedogenic particles in Chinese loess that may range from a lower size limit of similar to 10 nm to an upper limit of similar to 40 nm with a prevalent grain size maximum of similar to 21-25 nm. Numerical calculations of the time dependence of IRM decay demonstrate that the actual contribution of fine-grained pedogenic magnetite/maghemite to the total remanence is at least twice as large as that estimated by both cfd% and our proposed J(v)% parameter. We therefore propose that determination of superparamagnetic contributions by the time dependence of IRM viscosity is a useful technique for tracking pedogenic processes and hence paleoclimatic conditions of Chinese loess.
WOS关键词FINE-GRAINED MAGNETITE ; TIME-DEPENDENT IRM ; PLATEAU ; SEDIMENTS ; ENHANCEMENT ; REMANENCE ; RECORD ; SOILS ; SUSCEPTIBILITY ; DISSOLUTION
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000283074900002
出版者AMER GEOPHYSICAL UNION
资助机构Institute of Geomechanics(DZLXJK201008) ; Institute of Geomechanics(DZLXJK201008) ; NSFC(40774027 ; NSFC(40774027 ; China Geological Survey(1212010711705) ; China Geological Survey(1212010711705) ; Ministry of Land and Resources ; Ministry of Land and Resources ; 40974036) ; 40974036) ; Institute of Geomechanics(DZLXJK201008) ; Institute of Geomechanics(DZLXJK201008) ; NSFC(40774027 ; NSFC(40774027 ; China Geological Survey(1212010711705) ; China Geological Survey(1212010711705) ; Ministry of Land and Resources ; Ministry of Land and Resources ; 40974036) ; 40974036) ; Institute of Geomechanics(DZLXJK201008) ; Institute of Geomechanics(DZLXJK201008) ; NSFC(40774027 ; NSFC(40774027 ; China Geological Survey(1212010711705) ; China Geological Survey(1212010711705) ; Ministry of Land and Resources ; Ministry of Land and Resources ; 40974036) ; 40974036) ; Institute of Geomechanics(DZLXJK201008) ; Institute of Geomechanics(DZLXJK201008) ; NSFC(40774027 ; NSFC(40774027 ; China Geological Survey(1212010711705) ; China Geological Survey(1212010711705) ; Ministry of Land and Resources ; Ministry of Land and Resources ; 40974036) ; 40974036)
源URL[http://ir.iggcas.ac.cn/handle/132A11/72716]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Xisheng
作者单位1.Chinese Acad Geol Sci, Inst Geomech, Key Lab Paleomagnetism, Beijing 100081, Peoples R China
2.Univ Bergen, Dept Earth Sci, N-5007 Bergen, Norway
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Paleomagnetism & Geochronol Lab, Beijing 100029, Peoples R China
4.Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Xisheng,Lovlie, Reidar,Zhao, Xiangyu,et al. Quantifying ultrafine pedogenic magnetic particles in Chinese loess by monitoring viscous decay of superparamagnetism[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2010,11.
APA Wang, Xisheng,Lovlie, Reidar,Zhao, Xiangyu,Yang, Zhenyu,Jiang, Fuchu,&Wang, Shubing.(2010).Quantifying ultrafine pedogenic magnetic particles in Chinese loess by monitoring viscous decay of superparamagnetism.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,11.
MLA Wang, Xisheng,et al."Quantifying ultrafine pedogenic magnetic particles in Chinese loess by monitoring viscous decay of superparamagnetism".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 11(2010).

入库方式： OAI收割

来源：地质与地球物理研究所

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