Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess
The Laschamp geomagnetic excursion (LGE, at 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...
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ftchinacascieeca:oai:ir.ieecas.cn:361006/10074 2023-06-11T04:12:18+02:00 Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess Sun,YB(Sun,Youbin) 1,2 Qiang,XK(Qiang,Xiaoke) 1 Liu,QS(Liu,Qingsong) 3 Bloemendal,J(Bloemendal,Jan) 4,5 Wang,XL(Wang,Xulong) 1 2013-11-26 http://ir.ieecas.cn/handle/361006/10074 https://doi.org/10.1002/2013GC004828 英语 eng GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS http://ir.ieecas.cn/handle/361006/10074 doi:10.1002/2013GC004828 null Chinese Loess Laschamp Excursion Osl Dates Lock-in Effect 期刊论文 2013 ftchinacascieeca https://doi.org/10.1002/2013GC004828 2023-05-08T13:23:28Z The Laschamp geomagnetic excursion (LGE, at 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 (10Be flux) and marine (i.e., relative paleointensity and authogenic 10Be/9Be 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 highresolution chronological correlation to marine and ice core records, only if the potential lock-in effect can be precisely determined. Report Greenland Greenland ice core ice core Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Greenland Geochemistry, Geophysics, Geosystems 14 11 4952 4961 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Chinese Loess Laschamp Excursion Osl Dates Lock-in Effect |
spellingShingle |
Chinese Loess Laschamp Excursion Osl Dates Lock-in Effect Sun,YB(Sun,Youbin) 1,2 Qiang,XK(Qiang,Xiaoke) 1 Liu,QS(Liu,Qingsong) 3 Bloemendal,J(Bloemendal,Jan) 4,5 Wang,XL(Wang,Xulong) 1 Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess |
topic_facet |
Chinese Loess Laschamp Excursion Osl Dates Lock-in Effect |
description |
The Laschamp geomagnetic excursion (LGE, at 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 (10Be flux) and marine (i.e., relative paleointensity and authogenic 10Be/9Be 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 highresolution chronological correlation to marine and ice core records, only if the potential lock-in effect can be precisely determined. |
format |
Report |
author |
Sun,YB(Sun,Youbin) 1,2 Qiang,XK(Qiang,Xiaoke) 1 Liu,QS(Liu,Qingsong) 3 Bloemendal,J(Bloemendal,Jan) 4,5 Wang,XL(Wang,Xulong) 1 |
author_facet |
Sun,YB(Sun,Youbin) 1,2 Qiang,XK(Qiang,Xiaoke) 1 Liu,QS(Liu,Qingsong) 3 Bloemendal,J(Bloemendal,Jan) 4,5 Wang,XL(Wang,Xulong) 1 |
author_sort |
Sun,YB(Sun,Youbin) 1,2 |
title |
Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess |
title_short |
Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess |
title_full |
Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess |
title_fullStr |
Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess |
title_full_unstemmed |
Timing and lock-in effect of the Laschampgeomagnetic excursion in Chinese Loess |
title_sort |
timing and lock-in effect of the laschampgeomagnetic excursion in chinese loess |
publishDate |
2013 |
url |
http://ir.ieecas.cn/handle/361006/10074 https://doi.org/10.1002/2013GC004828 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_relation |
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS http://ir.ieecas.cn/handle/361006/10074 doi:10.1002/2013GC004828 |
op_rights |
null |
op_doi |
https://doi.org/10.1002/2013GC004828 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
14 |
container_issue |
11 |
container_start_page |
4952 |
op_container_end_page |
4961 |
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1768388058988675072 |