Climate fluctuation on a kiloyear scale during the Late Last Glacial in Mu Us Desert, China: evidence from Rb and Sr contents and ratios

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• 作者：Yuejun Si (1)
  Baosheng Li (1) (2)
  David Dian Zhang (3)
  Xiaohao Wen (1)
  Fengnian Wang (4)
  Shuhuan Du (5)
  Dongfeng Niu (1)
  Yihua Guo (6)
  
• 关键词：Mu Us Desert ; Milanggouwan section ; Rb and Sr ; Kiloyear ; scale climate changes ; Late last glacial
• 刊名：Environmental Earth Sciences
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：72
• 期：11
• 页码：4521-4530
• 全文大小：1,150 KB
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• 作者单位：Yuejun Si (1)
  Baosheng Li (1) (2)
  David Dian Zhang (3)
  Xiaohao Wen (1)
  Fengnian Wang (4)
  Shuhuan Du (5)
  Dongfeng Niu (1)
  Yihua Guo (6)
  
  1. School of Geographical Science, South China Normal University, Guangzhou, 510631, China
  2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China
  3. Department of Geography, University of Hong Kong, Pokfulam Road, Hong Kong, China
  4. Tourism Department, Huizhou University, Huizhou, 516007, China
  5. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510630, China
  6. Guangzhou Institute of Geography, Guangzhou, 510070, China
  
• ISSN：1866-6299

文摘

The MGS2 segment of the Milanggouwan stratigraphical section in China’s Salawusu River Valley records 5.5 sedimentary cycles consisting of dune sands alternating with fluviolacustrine facies or/and palaeosols. The high Rb and Sr contents and low Rb/Sr ratios in the fluviolacustrine facies indicate the presence of a warm and humid climate, and vice versa for a dry and cold climate. Rb and Sr appeared to have 5.5 element cycles that are consistent with the sedimentation changes, and each cycle lasts about 2?ka on average. This study suggests that the observed cycles mainly resulted from variations in the strength of the East Asian winter and summer monsoons, and the MGS2 segment experienced six cold-dry winter monsoons and five warm-humid summer monsoons during the OIS2. In addition, the millennial-scale monsoonal climate fluctuations revealed by the element cycles corresponded well with the Dansgaard–Oeschger cycles recorded in the Greenland ice cores and Heinrich events in the North Atlantic marine sediments. Therefore, the monsoonal climate fluctuations revealed by the Rb and Sr in the MGS2 segment were likely triggered by global climate change.