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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (6): 1661-1669    DOI: 10.7522/j.issn.1000-694X.2013.00247
Paleoclimate and Environment Evolution     
Variation of Zr/Rb Ratio from Aeolian Deposits and Its Implication in Dune Field in Northern China during the Late Quaternary
ZHOU Ya-li1,2, LU Hua-yu3, YI Shuang-wen3, WANG Xian-yan3
1.College of Tourism and Environment, Shaanxi Normal University, Xian 710062, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xian 710075, China;
3.School of Geographic and Oceanographic Sciences/Institute for Climate and Global Change Research, Nanjing University, Nanjing 210093, China
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Abstract  

Zr/Rb ratio is the better climatic proxy for the East Asian winter monsoon than coarse grain size fraction which is widely used, just because the post-depositional weathering and pedogenesis does not modify the Zr/Rb ratio due to the immobility of Zr and Rb elements. Compared with in the Loess Plateau, the climatic change was studied poorly in dund fields in northern China. There is a serious need for concerted studies to a new and reliable proxy which can reflect climate change sensitively. This study proposes the different variation of Zr/Rb ratio and the implication in dund fields. 11 typical aeolian deposits profiles were selected from Mu Us dune field, Otindag dune field and Horqin dune field in northern China where climate is controlled by the East Asia monsoon. The Zr/Rb ratio, element content of Zr and Rb as well as grain size of bulk sample were measured. Variations of the Zr/Rb ratio in Mu Us dune field encompassing the last 60 ka displayed a generally similar pattern to that of >63 μm and mean grain size of bulk samples which was consistent with the trend of the Loess Plateau, so the Zr/Rb ratio recorded the change of the East Asia winter monsoon. However, in Otindag dune field and Horqin dune field, Rb content in sandy soil increased with fine particles while Zr content also raised resulting in the opposite shift trend of Zr/Rb ratio, which was different from Mu Us dune field. The cause may be due to the three dune fields located in different tectonic geomorphic units, the provenances of aeolian material are different from each other. Therefore, Zr/Rb ratio used as winter monsoon strength proxy applied in different dune fields requires careful analysis.

Key words:  Late Quaternary      Zr/Rb ratio      East Asia Winter Monsoon      proxy      provenance of sand fields     
Received:  25 February 2013      Published:  26 March 2013
ZTFLH:  P532  

Cite this article: 

ZHOU Ya-li1,2, LU Hua-yu3, YI Shuang-wen3, WANG Xian-yan3. Variation of Zr/Rb Ratio from Aeolian Deposits and Its Implication in Dune Field in Northern China during the Late Quaternary. JOURNAL OF DESERT RESEARCH, 2013, 33(6): 1661-1669.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00247     OR     http://www.desert.ac.cn/EN/Y2013/V33/I6/1661

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