Variations in 87Sr/86Sr of the Huanxian profile, Loess Plateau of China from 40 ka B.P. to 10 ka B.P. and Heinrich events

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  • Yang Jie-Dong
    Center of Modern Analysis, Nanjing University State Key Laboratory of Mineralizing Processes of Ore Deposits, Nanjing University
  • Chen Jun
    Department of Earth Sciences, Nanjing University
  • Zhang Jian-Xin
    Department of Geography Sciences, Nanjing University

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説明

87Sr/86Sr ratios of acid-washed residues of the loess and paleosols since 40 ka B.P. from the Huanxian profile of the Loess Plateau, China, were determined. The investigation shows that 87Sr/86Sr ratios of the residues from the loess levels are generally lower than those from the paleosol levels. It is thought that the paleosol contain a higher proportion of the fine grain size parts (<2 um) than the loess. A correlation occurs among the variations in 87Sr/86Sr ratios, Zr/Rb ratios and mean grain size and, collectively they, imply that the East Asian winter monsoon was weak about from 40 ka B.P. to 30 ka, but it became stronger from about 30 ka B.P. to 10 ka B.P. Heinrich events of the North Atlantic region and Greenland correspond well to low 87Sr/86Sr ratios of residues of the Huanxian profile, which demonstrates that Heinrich events also influnced the east Asian region, including the Loess Plateau of China, and 87Sr/86Sr ratios of residues of the Loess Plateau can record information on high-frequency oscillations of the east Asian winter monsoon strength.

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