Determination of magnetic carriers of the characteristic remanent magnetization of Chinese loess by low-temperature demagnetization

doi:10.1016/S0012-821X(03)00477-1

	Determination of magnetic carriers of the characteristic remanent magnetization of Chinese loess by low-temperature demagnetization
	Liu, QS ; Jackson, MJ ; Banerjee, SK ; Zhu, RX ; Pan, YX ; Chen, FH
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2003-11-15
卷号	216 期号:1-2 页码:175-186
关键词	Chinese loess characteristic remanent magnetization magnetic carrier low-temperature demagnetization paleomagnetism
ISSN号	0012-821X
DOI	10.1016/S0012-821X(03)00477-1
文献子类	Article
英文摘要	The Chinese loess/paleosol sequences can provide excellent paleomagnetic records for detailed studies on both magnetostratigraphy and secular variations of the Earth's magnetic field. However, the nature of the loess/paleosol characteristic remanent magnetization (ChRM), isolated by thermal demagnetization from the natural remanent magnetization, still remains in debate. In this study, we directly measure the thermal, alternating field, and low-temperature demagnetization (cooling/warming cycle of remanence in zero field between 300 and 50 K) spectra of ChRM of the loess samples at Touxiangdao, Xining, PR China. The results show that coarse-grained, pseudo-single-domain (PSD)/multi-domain (MD) magnetite and PSD maghemite particles are the main magnetic carriers of the loess and paleosol ChRMs, respectively. By comparing the ChRM characteristics across a loess/paleosol transition zone. we have found that during pedogenesis, the thermally separable ChRM (original detrital remanent magnetization) carried by the PSD/MD magnetite in loess is gradually overprinted by the chemical remanent magnetization carried by PSD maghemite. Even moderate pedogenesis (e.g., for the pedogenically altered loess) can strongly affect the loess ChRM. Thus more attention has to be focused on the paleosol ChRM separated solely by thermal demagnetization, especially when constructing a continuous paleomagnetic record covering both loess and paleosol units. (C) 2003 Elsevier B.V. All rights reserved.
WOS关键词	MULTIDOMAIN MAGNETITE ; SATURATION REMANENCE ; PALEOSOL SEQUENCES ; SUSCEPTIBILITY RECORD ; SINGLE-CRYSTAL ; NORTHERN CHINA ; DOMAIN STATE ; GRAIN-SIZE ; DEPOSITS ; PLATEAU
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000186856300014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78733]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu, QS
作者单位	1.Univ Minnesota, Inst Rock Magnetism, Dept Geol & Geophys, Minneapolis, MN 55455 USA 2.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism Lab, Beijing 100029, Peoples R China 3.Lanzhou Univ, CAEP, Coll Earth & Environm Sci, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Liu, QS,Jackson, MJ,Banerjee, SK,et al. Determination of magnetic carriers of the characteristic remanent magnetization of Chinese loess by low-temperature demagnetization[J]. EARTH AND PLANETARY SCIENCE LETTERS,2003,216(1-2):175-186.
APA	Liu, QS,Jackson, MJ,Banerjee, SK,Zhu, RX,Pan, YX,&Chen, FH.(2003).Determination of magnetic carriers of the characteristic remanent magnetization of Chinese loess by low-temperature demagnetization.EARTH AND PLANETARY SCIENCE LETTERS,216(1-2),175-186.
MLA	Liu, QS,et al."Determination of magnetic carriers of the characteristic remanent magnetization of Chinese loess by low-temperature demagnetization".EARTH AND PLANETARY SCIENCE LETTERS 216.1-2(2003):175-186.