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Timing of the Brunhes-Matuyama magnetic polarity reversal inChinese loess using 10Be
Zhou,WJ(Zhou,Weijian)[1,2]; Beck,JW(Beck,J.Warren)[3]; Kong,XH(Kong,Xianghui)[1,2]; An,ZS(An,Zhisheng)[1]; Qiang,XK(Qiang,Xiaoke)[1]; Wu,ZK(Wu,Zhenkun)[1,2]; Xian,F(Xian,Feng)[1,2]; Ao,H(Ao,Hong)[1]
2014-09-08
Source PublicationGeology
Volume42Issue:6Pages:467-470
Subtype期刊论文
Abstract

In Chinese loess, the Brunhes-Matuyama (B-M) geomagnetic reversal occurs ~25 k.y. prior to the age found in marine sediments. This offset has been attributed by some to post-depositional magnetic overprinting of loess, while others have argued it is due to errors in the loess time scale. Here we solve this long-standing debate by exploiting a new method to extract reproducible records of geomagnetic fi eld intensity from loess with 10Be—a proxy for global average geomagnetic fi eld intensity—and using it to show that a pronounced minimum in field intensity (a requirement for dipole fi eld reversal) is recorded in two separate loess records at ca. 780 ± 3 kyr B.P. This timing is synchronous with the B-M reversal timing seen in marine records, verifying the standard loess time scale as correct, but it is ~25 k.y. younger than the age (depth) of the magnetic polarity reversal recorded in these same Chinese loess sediments, demonstrating that loess magnetic overprinting has occurred.

DOI10.1130/G35443.1
Indexed BySCI
Language英语
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9883
Collection加速器质谱中心
Corresponding AuthorZhou,WJ(Zhou,Weijian)[1,2]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710075, China;
2.Xi’an AMS Center, Institute of Earth Environment and Xi’an Jiaotong University, Xi’an 710061, China;
3.National Science Foundation Arizona Accelerator Mass Spectrometry Facility, University of Arizona, Tucson, Arizona 85721, USA
Recommended Citation
GB/T 7714
Zhou,WJ,Beck,JW,Kong,XH,et al. Timing of the Brunhes-Matuyama magnetic polarity reversal inChinese loess using 10Be[J]. Geology,2014,42(6):467-470.
APA Zhou,WJ.,Beck,JW.,Kong,XH.,An,ZS.,Qiang,XK.,...&Ao,H.(2014).Timing of the Brunhes-Matuyama magnetic polarity reversal inChinese loess using 10Be.Geology,42(6),467-470.
MLA Zhou,WJ,et al."Timing of the Brunhes-Matuyama magnetic polarity reversal inChinese loess using 10Be".Geology 42.6(2014):467-470.
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