Arid
DOI10.1186/s40623-018-0814-8
A paleomagnetic record in loess-paleosol sequences since late Pleistocene in the arid Central Asia
Li, Guanhua1,2; Xia, Dunsheng2; Appel, Erwin3; Wang, Youjun2; Jia, Jia2; Yang, Xiaoqiang1
通讯作者Li, Guanhua
来源期刊EARTH PLANETS AND SPACE
ISSN1880-5981
出版年2018
卷号70
英文摘要

Geomagnetic excursions during Brunhes epoch have been brought to the forefront topic in paleomagnetic study, as they provide key information about Earth’s interior dynamics and could serve as another tool for stratigraphic correlation among different lithology. Loess-paleosol sequences provide good archives for decoding geomagnetic excursions. However, the detailed pattern of these excursions was not sufficiently clarified due to pedogenic influence. In this study, paleomagnetic analysis was performed in loess-paleosol sequences on the northern piedmont of the Tianshan Mountains (northwestern China). By radiocarbon and luminance dating, the loess section was chronologically constrained to mainly the last c.130 ka, a period when several distinct geomagnetic excursions were involved. The rock magnetic properties in this loess section are dominated by magnetite and maghemite in a pseudo-single-domain state. The rock magnetic properties and magnetic anisotropy indicate weakly pedogenic influence for magnetic record. The stable component of remanent magnetization derived from thermal demagnetization revealed the presence of two intervals of directional anomalies with corresponding intensity lows in the Brunhes epoch. The age control in the key layers indicates these anomalies are likely associated with the Laschamp and Blake excursions, respectively. In addition, relative paleointensity in the loess section is basically compatible with other regional and global relative paleointensity records and indicates two low-paleointensity zones, possibly corresponding to the Blake and Laschamp excursions, respectively. As a result, this study suggests that the loess section may have the potential to record short-lived excursions, which largely reflect the variation of dipole components in the global archives.


英文关键词Geomagnetic excursion Blake excursion Laschamp excursion Relative paleointensity Loess Arid Central Asia
类型Article
语种英语
国家Peoples R China ; Germany
收录类别SCI-E
WOS记录号WOS:000428876400001
WOS关键词LASCHAMP GEOMAGNETIC EXCURSION ; CHINESE LOESS ; LOCK-IN ; MAGNETIC-SUSCEPTIBILITY ; RELATIVE PALEOINTENSITY ; POLARITY EPISODE ; MONO LAKE ; TIANSHAN MOUNTAINS ; BLAKE EVENT ; GRAIN-SIZE
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构兰州大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208614
作者单位1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Guangdong, Peoples R China;
2.Lanzhou Univ, Coll Earth & Environm Sci, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Gansu, Peoples R China;
3.Eberhard Karls Univ Tubingen, Dept Geosci, D-72074 Tubingen, Germany
推荐引用方式
GB/T 7714
Li, Guanhua,Xia, Dunsheng,Appel, Erwin,et al. A paleomagnetic record in loess-paleosol sequences since late Pleistocene in the arid Central Asia[J]. 兰州大学,2018,70.
APA Li, Guanhua,Xia, Dunsheng,Appel, Erwin,Wang, Youjun,Jia, Jia,&Yang, Xiaoqiang.(2018).A paleomagnetic record in loess-paleosol sequences since late Pleistocene in the arid Central Asia.EARTH PLANETS AND SPACE,70.
MLA Li, Guanhua,et al."A paleomagnetic record in loess-paleosol sequences since late Pleistocene in the arid Central Asia".EARTH PLANETS AND SPACE 70(2018).
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