Timing and lock-in effect of the Laschamp geomagnetic excursion in Chinese Loess

doi:10.1002/2013GC004828

	Timing and lock-in effect of the Laschamp geomagnetic excursion in Chinese Loess
	Sun, Youbin 1,2; Qiang, Xiaoke 1; Liu, Qingsong 3; Bloemendal, Jan 4,5; Wang, Xulong 1
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2013-11-01
卷号	14 期号:11 页码:4952-4961
关键词	Chinese Loess Laschamp excursion OSL dates lock-in effect
ISSN号	1525-2027
DOI	10.1002/2013GC004828
文献子类	Article
英文摘要	The Laschamp geomagnetic excursion (LGE, at similar to 41 ka) is a critical age control for hemispherical comparison of paleoclimate records from various kinds of geological archives (e. g., ice core, marine, and lake sediments). The timing of the LGE in Chinese Loess, however, remains poorly constrained due to the lack of a reliable chronology and the complex acquisition processes of natural remanent magnetization. Here, we systematically compare the paleomagnetic results of three optically stimulated luminescence dated loess sequences on the Chinese Loess Plateau. Our results indicate that the timing of the LGE in the northwestern Loess Plateau is slightly older than the absolute radiometric age determination and the timing inferred from Greenland ice core (Be-10 flux) and marine (i.e., relative paleointensity and authogenic Be-10/Be-9 stack) records, but younger than the counterparts in the central Loess Plateau. We attribute the different timing of the LGE in the three loess sections to a progressive southeastward increase in the lock-in depth caused by the combined effects of postdepositional processes (e. g., surface mixing, chemical weathering, and lock-in delay) on the remanence acquisition process. We conclude that caution is needed to use the LGE in Chinese Loess as a reliable tie-event for high-resolution chronological correlation to marine and ice core records, only if the potential lock-in effect can be precisely determined.
WOS关键词	POSTDEPOSITIONAL REMANENT MAGNETIZATION ; REGENERATIVE-DOSE PROTOCOL ; MATUYAMA-BRUNHES BOUNDARY ; NORTH-CENTRAL CHINA ; DEEP-SEA SEDIMENT ; ICE-CORE ; PALEOINTENSITY STACK ; K-AR ; RECORD ; FIELD
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000330531900015
资助机构	Chinese Academy of Sciences(KZCX-EW-114) ; Chinese Academy of Sciences(KZCX-EW-114) ; Natural Science Foundation of China(41072272 ; Natural Science Foundation of China(41072272 ; NSFC(41025013 ; NSFC(41025013 ; 41272208) ; 41272208) ; 40974036) ; 40974036) ; Chinese Academy of Sciences(KZCX-EW-114) ; Chinese Academy of Sciences(KZCX-EW-114) ; Natural Science Foundation of China(41072272 ; Natural Science Foundation of China(41072272 ; NSFC(41025013 ; NSFC(41025013 ; 41272208) ; 41272208) ; 40974036) ; 40974036) ; Chinese Academy of Sciences(KZCX-EW-114) ; Chinese Academy of Sciences(KZCX-EW-114) ; Natural Science Foundation of China(41072272 ; Natural Science Foundation of China(41072272 ; NSFC(41025013 ; NSFC(41025013 ; 41272208) ; 41272208) ; 40974036) ; 40974036) ; Chinese Academy of Sciences(KZCX-EW-114) ; Chinese Academy of Sciences(KZCX-EW-114) ; Natural Science Foundation of China(41072272 ; Natural Science Foundation of China(41072272 ; NSFC(41025013 ; NSFC(41025013 ; 41272208) ; 41272208) ; 40974036) ; 40974036)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86552]
专题	中国科学院地质与地球物理研究所
通讯作者	Sun, Youbin
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Xian 710075, Peoples R China 4.Univ Liverpool, Dept Geog & Planning, Liverpool L69 3BX, Merseyside, England 5.Lanzhou Univ, Cooperat Innovat Ctr Arid Environm & Climate Chan, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Sun, Youbin,Qiang, Xiaoke,Liu, Qingsong,et al. Timing and lock-in effect of the Laschamp geomagnetic excursion in Chinese Loess[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2013,14(11):4952-4961.
APA	Sun, Youbin,Qiang, Xiaoke,Liu, Qingsong,Bloemendal, Jan,&Wang, Xulong.(2013).Timing and lock-in effect of the Laschamp geomagnetic excursion in Chinese Loess.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,14(11),4952-4961.
MLA	Sun, Youbin,et al."Timing and lock-in effect of the Laschamp geomagnetic excursion in Chinese Loess".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 14.11(2013):4952-4961.