Report
Timing of the Brunhes-Matuyama magnetic polarity reversal inChinese loess using 10Be
| العنوان: | Timing of the Brunhes-Matuyama magnetic polarity reversal inChinese loess using 10Be |
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| المؤلفون: | 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 |
| سنة النشر: | 2014 |
| المجموعة: | Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) / 中国科学院地球环境研究所机构知识库 |
| الوصف: | 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. |
| نوع الوثيقة: | report |
| اللغة: | English |
| Relation: | Geology; http://ir.ieecas.cn/handle/361006/9883 |
| DOI: | 10.1130/G35443.1 |
| الاتاحة: | http://ir.ieecas.cn/handle/361006/9883 https://doi.org/10.1130/G35443.1 |
| Rights: | "null" |
| رقم الانضمام: | edsbas.A5C049AB |
| قاعدة البيانات: | BASE |
| DOI: | 10.1130/G35443.1 |
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