Can relative paleointensities be determined from the normalized magnetization of the wind-blown loess of China?

	Can relative paleointensities be determined from the normalized magnetization of the wind-blown loess of China?
	Pan, YX ; Zhu, RX ; Shaw, J ; Liu, QS ; Guo, B
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2001-09-10
卷号	106 期号:B9 页码:19221-19232
ISSN号	2169-9313
文献子类	Article
英文摘要	Although the wind-blown loess and interbedded paleosol sequence in the Loess Plateau of China has been extensively studied and regarded as one of the most complete terrestrial records of both the geomagnetic field and climatic changes during the Quaternary, little attention has been paid to it as a source of relative paleointensity. In this study, we examine the Malan loess (L1), the last glacial sediments, in the Lingtai section to determine whether loess is able to reliably record the relative paleointensity. Toward that end both the conventional normalizing method as well as the pseudo-Thellier method [Tauxe et al., 1995] were used in conjunction with the examination of the rock magnetic properties and natural remanent magnetization (NRM). Rock magnetic properties of L1 show the uniformity in terms of magnetic mineralogy and grain size, suggesting that they may be suitable for relative paleointensity studies. Normalized remanences derived from L1 show highs between both 72-66 ka and 62-51 ka and lows near 63 ka, 42 ka and between 20 and 10 ka. Comparable results using different normalization parameters suggest that large-amplitude variation of normalized magnetization may reflect the intensity variation of the geomagnetic field. However, comparisons of the normalized magnetization with contemporaneous marine records show some dissimilarities. In particular, the intensity low at 20-10 ka, corresponding to the last glacial maximum, is not compatible with the Sint-800 composite record. On the other hand, spectral coherence analyses of middle- and high-frequency components of the normalized magnetizations suggest some climatic influence. Thus this apparent discrepancy may be explained by climatic changes in the Loess Plateau and the resulting effect on the NRM.
WOS关键词	GEOMAGNETIC-FIELD INTENSITY ; NORTH-ATLANTIC OCEAN ; DEEP-SEA SEDIMENT ; REMANENT MAGNETIZATION ; CLIMATE ; ROCK ; PLATEAU ; MAGNETOSTRATIGRAPHY ; MAGNETISM ; SEQUENCES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000170973600003
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77161]
专题	中国科学院地质与地球物理研究所
通讯作者	Pan, YX
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism Lab, Beijing 100101, Peoples R China 2.Univ Liverpool, Geomagnetism Lab, Liverpool L69 7ZE, Merseyside, England 3.Univ Minnesota, Inst Rock Magnetism, Minneapolis, MN 55455 USA
推荐引用方式 GB/T 7714	Pan, YX,Zhu, RX,Shaw, J,et al. Can relative paleointensities be determined from the normalized magnetization of the wind-blown loess of China?[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2001,106(B9):19221-19232.
APA	Pan, YX,Zhu, RX,Shaw, J,Liu, QS,&Guo, B.(2001).Can relative paleointensities be determined from the normalized magnetization of the wind-blown loess of China?.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,106(B9),19221-19232.
MLA	Pan, YX,et al."Can relative paleointensities be determined from the normalized magnetization of the wind-blown loess of China?".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 106.B9(2001):19221-19232.