Inter-profile correlation of the Chinese loess/paleosol sequences during Marine Oxygen Isotope Stage 5 and indications of pedogenesis

doi:10.1016/j.quascirev.2004.07.021

	Inter-profile correlation of the Chinese loess/paleosol sequences during Marine Oxygen Isotope Stage 5 and indications of pedogenesis
	Liu, QS ; Banerjee, SK ; Jackson, MJ ; Deng, CL ; Pan, YX ; Zhu, RX
刊名	QUATERNARY SCIENCE REVIEWS
	2005
卷号	24 期号:1-2 页码:195-210
ISSN号	0277-3791
DOI	10.1016/j.quascirev.2004.07.021
文献子类	Article
英文摘要	Low-field magnetic susceptibility has been widely used to determine the pedostratigraphy of the Chinese loess/paleosol sequences. However, uncertainties remain in correlating between the loess magnetic susceptibility and the marine oxygen isotope records because susceptibility variations are affected by both global and local paleoclimatic changes. To provide a more sound paleoclimatic interpretation of magnetic susceptibility variations, age models across Marine Oxygen Isotope Stage (MIS) 5 for the Jiuzhoutai (JZT) and Yuanbao (YB) sections, western Chinese Loess Plateau, were constructed through an integrated approach by linking the major pedostratigraphic boundaries of the loess profiles to the SPECMAP oxygen isotope curve, and by correlating relative magnetic paleointensity records with both the SINT800 global paleointensity stack from marine sediments and 36 Cl records from the GRIP ice core. Results indicate good correlation of SIRM60mT (a residual remanence of saturation isothermal remane'nt magnetization after a 60 mT alternating field demagnetization) variations between these two sites, which agree well with fluctuations in subtropical Atlantic sea surface temperatures. All cooling events recorded by ice-core and Atlantic marine sediments within MIS5 have counterparts in SIRM60mT. SIRM60mT is partially controlled by the degree of low-temperature oxidation, which is strongly temperature dependent. However, strong pedogenesis can decrease SIRM60mT due to further oxidation of partially oxidized magnetites above some critical points. Therefore, we propose that SIRM60mT is best suited to record paleotemperature changes in loess profiles from the western Chinese Loess Plateau, where pedogenesis is the weakest. Furthermore, by inter-profile correlation between the YB and JZT sections, we note that the seemingly uniform sub-paleosol unit with a broad susceptibility peak (previously assigned to MIS5c) between similar to34.4 and similar to37.4m in the YB profile actually consists of two independent units (lower part of SIL1/ MIS5b and SIS2/MIS5c). This indicates that susceptibility values can be strongly affected by local factors (e.g., mainly precipitation). Therefore, beside the simplistic traditional paleoclimatic interpretation of variations in loess susceptibility involving only cold/dry and warm/humid scenarios, cold/humid and warm/dry scenarios should also be considered. (C) 2004 Elsevier Ltd. All rights reserved.
WOS关键词	MAGNETIC-SUSCEPTIBILITY SIGNAL ; SCALE CLIMATE VARIABILITY ; MATUYAMA-BRUNHES BOUNDARY ; LOW-TEMPERATURE OXIDATION ; LAST GLACIAL CYCLE ; LOESS PLATEAU ; ICE-CORE ; GEOMAGNETIC PALEOINTENSITY ; MILLENNIAL-SCALE ; NORTH-ATLANTIC
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000225762700012
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/65376]
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, Minneapolis, MN 55455 USA 2.Chinese Acad Sci, Inst Geochem & Geophys, Paleomagnetism Lab, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, QS,Banerjee, SK,Jackson, MJ,et al. Inter-profile correlation of the Chinese loess/paleosol sequences during Marine Oxygen Isotope Stage 5 and indications of pedogenesis[J]. QUATERNARY SCIENCE REVIEWS,2005,24(1-2):195-210.
APA	Liu, QS,Banerjee, SK,Jackson, MJ,Deng, CL,Pan, YX,&Zhu, RX.(2005).Inter-profile correlation of the Chinese loess/paleosol sequences during Marine Oxygen Isotope Stage 5 and indications of pedogenesis.QUATERNARY SCIENCE REVIEWS,24(1-2),195-210.
MLA	Liu, QS,et al."Inter-profile correlation of the Chinese loess/paleosol sequences during Marine Oxygen Isotope Stage 5 and indications of pedogenesis".QUATERNARY SCIENCE REVIEWS 24.1-2(2005):195-210.