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 9th IAMAS
Scientific
Assembly
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Records of carbon and oxygen isotopes and paleoclimate reconstruction from a stalagmite from Shuinan Cave, Guilin
Meiliang Zhang, Hai Cheng, Yushi Lin, Jiaming Qin, Xiaoyin Zhu, Hua Wang, Yumei Feng, Linlin Tu
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The time sequence of palaeclimatic change from 245.2 ka B.P. to 147.9 ka B.P. has been established by the dating ages of the high precision TIMS-U series and the analysis of oxygen isotopes from stalagmites of Shuinan Cave in Guilin area, and confirmed that the boundary ages of stage (3)/(2) and stage (2)/(1) are 192.6±3.9 ka B.P. (corresponds to the deep-sea core oxygen isotope stage 6/7), 242.5±6.4 ka B.P. (corresponds to the deep-sea core oxygen isotope stage 7/8) respectively which is got by using TIMS-U series dating age at 86.5 cm on the stalagmite section and depositional cycles of the stalagmite section and the sudden change characteristics. The study result indicated that the paleo-climate (or paleo-monsoon) change reflected by the cold and warm events of the stalagmite record during 245.2 ka B.P. and 147.9 ka B.P. can be divided into three stages of climate change: (1) the period from 245.2 ka B.P. to 242.6 ka B.P. corresponds to the last stage of the deep-sea core oxygen (SPECMAP) stage 8; (2) the penultimate interglacial period from 242.5 ka B.P. to 192.6 ka B.P. corresponds to stage 7 of the deep-sea core oxygen curve (SPECMAP curve); (3) the penultimate glacial period from 192.6 ka B.P to 147.9 ka B.P. corresponds to stage 6 of the deep-sea core oxygen curve (SPECMAP curve). The records of TIMS-U series dating ages and stable isotopes from the stalagmite revealed that the evolution history of the East Asian monsoon from 242.6 ka B.P. to 147.9 ka B.P. occurred in Guilin area were good provided with the paleo-climate and paleo-mosoon changes revealed by the records of the deep-sea core oxygen isotope stage 6 and 7, spore-pollen combination and CaCO3 content from the deep-sea core records and loess and paleosol from the North China, rose and fell in the sea level, forming soil and complete iron accumulation degree of loess and paleosol, magnetization rate change and the original crumb CaCO3 content and eluviation intension from the North China and so on. These characteristics showed that the paleo-climate evolution since the late stage of the middle Pleistocene Epoch in Guilin area not only have the global characteristics but also have the strong district characteristics.
Keywords: STALAGMITES, TIMS-U SERIES AGES, ISOTOPE RECORD, PALEOCLIMATE RECONSTRUCTION, SHUINAN CAVE
Meiliang Zhang, Chinese Academy of Geological Sciences, Karst Dynamics Key Laboratory, Institute of Karst Geology, Guilin 541004, China, mlzh@karst.edu.cn
Hai Cheng, University of Minnesota, Department of Geology and Geophysics
Yushi Lin, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China
Jiaming Qin, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China
Xiaoyin Zhu, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China
Hua Wang, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China
Yumei Feng, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China
Linlin Tu, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China
Session: Climate, Humans and the Environment in Asia
Sub-Theme: East Asian Monsoon
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