Magnetic signature of environmental change reflected by Pleistocene lacustrine sediments from the Nihewan Basin, North China

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	Magnetic signature of environmental change reflected by Pleistocene lacustrine sediments from the Nihewan Basin, North China
	Wang, XS (Wang, Xisheng); Lovlie, R (Lovlie, Reidar); Su, P (Su, Pu); Fan, XZ (Fan, Xingzhao)
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2008
卷号	260 期号:3-4 页码:452-462
关键词	lacustrine eolian runoff mineral magnetism Chinese Loess Plateau Nihewan Pleistocene
ISSN号	0031-0182
英文摘要	A mineral magnetic study has been conducted on Pleistocene lacustrine sediments from the Xujiayao Paleolithic site within the Nihewan Basin, North China. The magnetic signal is characterized by a dominance of high-coercivity (hematite) minerals that is modulated by low-coercivity magnetite-maghemite assemblages during interglacials. A high-amplitude record of the composition dependent magnetic S-(0.3-T)-parameter varies in accord with composite marine oxygen isotope records, suggesting climate modulation of magnetic composition. The Xujiayao site is situated at the northern outskirts of the Chinese Loess Plateau (CLP) and has neither received significant eolian input nor been exposed to pedogenic processes comparable to those acting on CLP. Mineral magnetic analyses suggest that variations in both magnetite and hematite are primarily controlled by detrital fluxes rather than by authigenic production of magnetic minerals. Here we propose that the fluctuations of magnetic signals at Xujiayao are not derived from varying compositions of eolian flux with glacial/interglacial periods or minute eolian influx during interglacials, but is likely dominated by runoff-related processes, by which some weathered/pedogenized loess and soils with stronger magnetic signals have been eroded and transported to the catchment during interglacials resulting in magnetic enhancement. The inferred continuous deposition from the Brunhes/Matuyama boundary to the paleosol S-1 (ca. 129 ka) gives the age of ca. 500 ka for the sediments carrying the Xujiayao Paleolithic site, suggesting an allogenic origin of the Paleolithic artifacts and mammalian bones dated by U-Th method to ca. 100 ka. (C) 2008 Elsevier B.V. All rights reserved.
学科主题	第四纪地质
WOS关键词	LOESS-PALEOSOL SEQUENCES ; ROCK MAGNETISM ; PALEOCLIMATIC SIGNIFICANCE ; ASTRONOMICAL CALIBRATION ; PALEOLITHIC SITE ; PLATEAU ; SUSCEPTIBILITY ; CLIMATE ; RECORD ; ASIA
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000255474200011
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38786]
专题	中国地质调查局
作者单位	Taiyuan Univ Technol, Dept Geosci, Shanxi 030024, Peoples R China
推荐引用方式 GB/T 7714	Wang, XS ,Lovlie, R ,Su, P ,et al. Magnetic signature of environmental change reflected by Pleistocene lacustrine sediments from the Nihewan Basin, North China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2008,260(3-4):452-462.
APA	Wang, XS ,Lovlie, R ,Su, P ,&Fan, XZ .(2008).Magnetic signature of environmental change reflected by Pleistocene lacustrine sediments from the Nihewan Basin, North China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,260(3-4),452-462.
MLA	Wang, XS ,et al."Magnetic signature of environmental change reflected by Pleistocene lacustrine sediments from the Nihewan Basin, North China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 260.3-4(2008):452-462.