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Reconstruction of 130-kyr Relative Geomagnetic Intensities from 10Be in Two Chinese Loess Sections

Published online by Cambridge University Press:  18 July 2016

Weijian Zhou ,
Feng Xian ,
J Warren Beck ,
A J Timothy Jull ,
Zhisheng An ,
Zhenkun Wu ,
Min Liu ,
Maobai Chen ,
Alfred Priller  and
Walter Kutschera
...Show all authors
Weijian Zhou*
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Xi'an AMS Center, Xi'an 710052, China Human Settlements and Engineering School of Xi'an Jiaotong University, Xi'an 710049, China
Feng Xian
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Xi'an AMS Center, Xi'an 710052, China
J Warren Beck
Affiliation:
NSF-Arizona AMS Facility, University of Arizona, Tucson, Arizona 85721, USA
A J Timothy Jull
Affiliation:
NSF-Arizona AMS Facility, University of Arizona, Tucson, Arizona 85721, USA
Zhisheng An
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
Zhenkun Wu
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Xi'an AMS Center, Xi'an 710052, China
Min Liu
Affiliation:
Xi'an AMS Center, Xi'an 710052, China
Maobai Chen
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Xi'an AMS Center, Xi'an 710052, China
Alfred Priller
Affiliation:
VERA (Vienna Environmental Research Accelerator), University of Vienna, Waehringer Str. 17, Vienna 1090, Austria
Walter Kutschera
Affiliation:
VERA (Vienna Environmental Research Accelerator), University of Vienna, Waehringer Str. 17, Vienna 1090, Austria
George S Burr
Affiliation:
NSF-Arizona AMS Facility, University of Arizona, Tucson, Arizona 85721, USA
Huagui Yu
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Shaohua Song
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
Peng Cheng
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Xi'an AMS Center, Xi'an 710052, China
Xianghui Kong
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China
*
Corresponding author. Email: weijian@loess.llqg.ac.cn.
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Abstract

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Efforts to extract weak geomagnetic excursion signals from Chinese loess-paleosol 10Be have generally been unsuccessful due to the complexities of its accumulation, because the geomagnetic and climate (precipitation and dust) signals contained in loess-paleosol sequence are tightly overprinted. Here, we present a reconstruction of geomagnetic relative paleointensities for the past 130 kyr from 10Be records in 2 Chinese loess-paleosol sections using a correction based on the correlation of 10Be with magnetic susceptibility (SUS) to remove the climatic contamination. Both these records reveal the Laschamp and Blake events, which lie in the loess and paleosol (L1SS1 and S1SS3) horizons corresponding to mid-MIS 3 and 5e, respectively. The good agreement between our results and other geomagnetic intensities reconstructions from Atlantic and Pacific sediments indicates that our method is robust. Our study suggests the potential application of loess-paleosol 10Be for reconstructing geomagnetic intensity variations spanning the whole Quaternary.

Type
Methods, Applications, and Developments
Information
Radiocarbon , Volume 52 , Issue 1 , 2010 , pp. 129 - 147
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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