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Implication of Boron Isotope Geochemistry for the Pedogenic Environments in Loess and Paleosol Sequences of Central China

Published online by Cambridge University Press:  20 January 2017

Hai-Zhen Wei ,
Fang Lei ,
Shao-Yong Jiang ,
Hua-Yu Lu ,
Ying-Kai Xiao ,
Han-Zhi Zhang  and
Xue-Feng Sun
Hai-Zhen Wei
Affiliation:
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, PR China
Fang Lei
Affiliation:
School of Geographic and Oceanographic Sciences, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210093, PR China
Shao-Yong Jiang*
Affiliation:
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, PR China State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China
Hua-Yu Lu*
Affiliation:
School of Geographic and Oceanographic Sciences, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210093, PR China
Ying-Kai Xiao
Affiliation:
Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810003, PR China
Han-Zhi Zhang
Affiliation:
School of Geographic and Oceanographic Sciences, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210093, PR China
Xue-Feng Sun
Affiliation:
School of Geographic and Oceanographic Sciences, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210093, PR China
*
*Correspondence to: S.-Y. Jiang, State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, PR China.
*Correspondence to: S.-Y. Jiang, State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, PR China.
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Abstract

We investigated the boron isotopic composition in loess–paleosol sequences in five different profiles in the Chinese Loess Plateau. Three possible boron sources are identified: atmospheric input, carbonates, and weathered silicate rocks. Variations of [Sr], [B], δ11B and the magnetic susceptibility correlate well with the pedogenetic intensity in three out of the five studied profiles, where pedogenesis under a cold–dry climate indicates lower δ11B, lower [B], lower magnetic susceptibility and higher [Sr] values. Exceptions to the variations between the δ11B and other known proxies were observed in arenaceous soils and the Red Clay sequence: the former suggested that vertical redistribution probably occurred with the boron migration, and the latter indicated an unknown mechanism of susceptibility enhancement. A better correlation between the δ11B and magnetic susceptibility and the quantitative estimation of boron budget from each source confirms the influence of paleoenvironmental changes on boron geochemical cycle. Significant positive correlations in Sr/Ca vs. B/Ca and Mg/Ca vs. B/Ca reflect consistent enrichment behavior of those mobile elements into calcium carbonate. The preliminary results imply that boron isotopic compositions in soils can be a potential geochemical proxy to reconstruct the paleoenvironmental changes in loess–paleosol sequences.

Keywords

Boron isotopic compositionLoess–paleosol sequencesPedogenesis environmentLoess PlateauChina

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Type
Research Article
Information
Quaternary Research , Volume 83 , Issue 1 , January 2015 , pp. 243 - 255
Copyright
University of Washington

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