The δ18O variation of a stalagmite from Qixing Cave, Guizhou Province and indicated climate change during the Holocene |
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Authors: | Yanjun Cai Meiliang Zhang Zicheng Peng Yushi Lin Zhisheng An Zhaofeng Zhang Yunning Cao |
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Institution: | (1) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710054 Xi’an, China;(2) Karst Dynamics Laboratory, Ministry of Land and Resources, 541003 Guilin, China;(3) Department of Earth and Space Science, University of Science & Technology of China, 230023 Hefei, China |
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Abstract: | A stalagmite from Qixing Cave, Guizhou Province was dated with the TIMS U-series method and its oxygen isotope composition
was analyzed. On the basis of the ages and the variations of the δ18O of the stalagmite, the climate change of the last 7.7 ka has been reconstructed in this area: 7.7–5.8 ka, summer monsoon
maximum period; 5.8–3.8 ka summer monsoon weakening period; 3.8–0.15 ka, weakened summer monsoon and high amplitude climate
fluctuations period. We put forward that the increasing trend of δ18O of the stalagmite reflected not only the weakening of the summer monsoon, which was caused by the decreasing of solar radiation
in the Northern Hemisphere, but also the possibly decreasing contribution of the southwest monsoon to the rainfall of this
area. These results are consistent with the output of the numerical climate-model modeling. The high amplitude fluctuation
of the δ18O may imply the quick shift of the contributions of different moisture sources to the precipitation in this area. |
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Keywords: | stalagmite Holocene southwest monsoon |
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