Paleoenvironmental significance of the magnetic fabrics in Chinese loess-paleosols since the last interglacial (< 130 ka)

doi:10.1016/S0012-821X(04)00103-7

	Paleoenvironmental significance of the magnetic fabrics in Chinese loess-paleosols since the last interglacial (< 130 ka)
	Zhu, RX ; Liu, QS ; Jackson, MJ
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2004-04-30
卷号	221 期号:1-4 页码:55-69
关键词	AMS Chinese loess Lingtai paleowind strength paleowind direction monsoon
ISSN号	0012-821X
DOI	10.1016/S0012-821X(04)00103-7
文献子类	Article
英文摘要	We compare new anisotropy of magnetic susceptibility (AMS) data with previously-determined paleoclimatically sensitive parameters for a loess profile at Lingtai, central Loess Plateau, China, to unravel factors that control loess AMS. Magnetic lineations are clustered along NE-SW and NW-SE orientations during cold and warm periods, respectively, which probably corresponded to paleowind directions of both winter and summer monsoons. Anomalously steep magnetic foliations coincidentally occur at the paleoclimatic stage boundaries, indicating sediment disturbance. Lineation strength appears to be sensitive to millennial-scale rapid paleoclimatic fluctuations. Generally, the winter monsoon produces a lower degree of lineation than the summer monsoon. Furthermore, by studying lineation subsets for the cold and warm periods, we find that the cold-interval lineation strengths co-vary with grain size over the last similar to 70 ka. During the last interglacial (about 74-128 ka), the lineation and declination of the susceptibility maximum (Dec-K-max) are sensitive to rapid fluctuations in winter and summer monsoons. Long-term trends of magnetic foliation and anisotropy degree replicate grain size variations, with superimposed short-term peaks related to post-depositional compaction, as suggested by density. The AMS shape parameter (7) indicates oblate fabrics. These new findings will not only improve our understandings of loess AMS, but also expand the possibilities of paleoclimatic studies in the Chinese loess. (C) 2004 Elsevier B.V. All rights reserved.
WOS关键词	TEMPERATURE-DEPENDENT SUSCEPTIBILITY ; M-RS/M-S ; PALEOCLIMATIC SIGNIFICANCE ; HYSTERESIS PROPERTIES ; GRAIN-SIZE ; PLATEAU ; ANISOTROPY ; RECORD ; SEQUENCE ; ROCKS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000220944500005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79751]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhu, RX
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism Lab, Beijing 100029, Peoples R China 2.Univ Minnesota, Inst Rock Magnetism, Minneapolis, MN 55455 USA 3.Univ Minnesota, Dept Geol & Geophys, Minneapolis, MN 55455 USA
推荐引用方式 GB/T 7714	Zhu, RX,Liu, QS,Jackson, MJ. Paleoenvironmental significance of the magnetic fabrics in Chinese loess-paleosols since the last interglacial (< 130 ka)[J]. EARTH AND PLANETARY SCIENCE LETTERS,2004,221(1-4):55-69.
APA	Zhu, RX,Liu, QS,&Jackson, MJ.(2004).Paleoenvironmental significance of the magnetic fabrics in Chinese loess-paleosols since the last interglacial (< 130 ka).EARTH AND PLANETARY SCIENCE LETTERS,221(1-4),55-69.
MLA	Zhu, RX,et al."Paleoenvironmental significance of the magnetic fabrics in Chinese loess-paleosols since the last interglacial (< 130 ka)".EARTH AND PLANETARY SCIENCE LETTERS 221.1-4(2004):55-69.