Magnetic properties of loess deposits on the northeastern Qinghai-Tibetan Plateau: palaeoclimatic implications for the Late Pleistocene

doi:10.1111/j.1365-246X.2006.03007.x

	Magnetic properties of loess deposits on the northeastern Qinghai-Tibetan Plateau: palaeoclimatic implications for the Late Pleistocene
	Wang, Xiaoyong ; Lu, Huayu ; Xu, Huifang ; Deng, Chenglong ; Chen, Tianhu ; Wang, Xianyan
刊名	GEOPHYSICAL JOURNAL INTERNATIONAL
	2006-12-01
卷号	167 期号:3 页码:1138-1147
关键词	Loess Northeastern Qinghai-tibetan Plateau Palaeosol Rock Magnetism
ISSN号	0956-540X
DOI	10.1111/j.1365-246X.2006.03007.x
文献子类	Article
英文摘要	The loess-palaeosol deposit on the northeastern Qinghai-Tibetan Plateau is sensitive to environmental changes, thus providing a good opportunity to investigate regional palaeoenvironmental evolution and its relationship with global climatic changes. Detailed rock magnetic investigations and grain-size determination were carried out on a 35-m-thick loess-palaeosol sequence at Dongchuan, the northeastern Qinghai-Tibetan Plateau. The principal ferrimagnetic minerals in both the loess and palaeosol units are large pseudo-single domain magnetite/maghemite. Palaeosol units are generally enriched in ultrafine-grained magnetite/maghemite of pedogenic origin. Variations of low-field magnetic susceptibility and frequency-dependent susceptibility in the loess and palaeosols can mainly be attributed to changes in the concentration of these minerals. Higher values of frequency-dependent susceptibility occur in the palaeosol horizons except for the weakly developed palaeosol, suggesting that higher concentrations of ultrafine magnetite/maghemite particles occur in palaeosol units due to in situ pedogenesis. The frequency-dependent susceptibility of the loess units is very low and uniform, indicating absence of the super-paramagnetic grains and negligible pedogenically induced enhancement of magnetic susceptibility. Generally, magnetic susceptibility combined with the frequency-dependent susceptibility of the loess-palaeosol sequences reflect the glacial-interglacial changes, thus can be employed as a proxy measure of palaeoclimate in this region. However, the low-field magnetic susceptibility record does not consistently correlate to the variations in stratigraphy of the Dongchuan loess-palaeosol sequence. It is thus suggested that multiparameter rock magnetic investigations combined with non-magnetic measurements, such as grain-size analysis, represent a more powerful approach for palaeoclimatic research into the complex loess-palaeosol record in the Qinghai-Tibetan Plateau.
WOS关键词	TEMPERATURE-DEPENDENT SUSCEPTIBILITY ; DEEP-SEA SEDIMENTS ; CHINESE LOESS ; PALEOSOL SEQUENCES ; GRAIN-SIZE ; LOESS/PALEOSOL SEQUENCE ; MONSOON VARIATION ; HOLOCENE LOESS ; ROCK MAGNETISM ; RECORD
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000242661600009
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/65900]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, Xiaoyong
作者单位	1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710075, Peoples R China 2.Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA 3.Chinese Acad Sci, SKL LE, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab, Beijing 100029, Peoples R China 4.Hefei Univ Technol, Sch Nat Resource & Environm, Hefei 230009, Peoples R China 5.Nanjing Univ, Dept Geog, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiaoyong,Lu, Huayu,Xu, Huifang,et al. Magnetic properties of loess deposits on the northeastern Qinghai-Tibetan Plateau: palaeoclimatic implications for the Late Pleistocene[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2006,167(3):1138-1147.
APA	Wang, Xiaoyong,Lu, Huayu,Xu, Huifang,Deng, Chenglong,Chen, Tianhu,&Wang, Xianyan.(2006).Magnetic properties of loess deposits on the northeastern Qinghai-Tibetan Plateau: palaeoclimatic implications for the Late Pleistocene.GEOPHYSICAL JOURNAL INTERNATIONAL,167(3),1138-1147.
MLA	Wang, Xiaoyong,et al."Magnetic properties of loess deposits on the northeastern Qinghai-Tibetan Plateau: palaeoclimatic implications for the Late Pleistocene".GEOPHYSICAL JOURNAL INTERNATIONAL 167.3(2006):1138-1147.