Paleoclimatic interpretation of the past 30 ka from isotopic studies of the deep confined aquifer of the North China plain |
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| Institution: | 1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Department of Environmental Informatics, Helmholtz Centre for Environmental Research - UFZ, Permoserstrasse 15, 04318 Leipzig, Germany;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, Guizhou, PR China;2. School of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, Henan, PR China;1. Institute of Isotope Hydrology, College of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;3. Isotope Hydrology Section, Division of Physical and Chemical Sciences, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, P.O. Box 100, A-1400 Vienna, Austria;4. Xiaolangdi Dam Project and Management Bureau, The Ministry of Water Resources of China, Zhengzhou 450000, China;1. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China;2. Key Laboratory of Groundwater Remediation of Hebei Province & China Geological Survey, Zhengding, Hebei 050083, China;3. Shen Kan Qinhuangdao General Engineering Design & Research Institute Corporation, MCC, Qinhuangdao, Hebei 066004, China;4. School of Water Resources & Environment, China University of Geosciences (Beijing), Beijing 100083, China;5. Suzhou Guanfu Environmental Science & Technology Co., Ltd, Suzhou, Jiangsu 215163, China;6. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;2. National Centre for Groundwater Research and Training, Adelaide, SA, Australia;3. Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, USA;4. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;5. School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, China;6. Department of Geological Science, University of Alabama, Tuscaloosa, AL, USA |
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| Abstract: | The δ18O and δD values in the deep confined aquifer beneath the North China Plain which is located at 112°30′E–119°30′E and 34°46′N–40°25′N, reflect differences in paleoclimatic conditions between the Holocene and the late Pleistocene. Groundwater samples whose 14C ages are between 12 and 25 ka B.P have ranges of ?9.4 to ?11.7‰ for δ18O and ?76‰ to ?85‰ for δD values. These very negative δ18O and δD values reflect the cold and arid climate in the last glacial period. The temperature estimated in this period is 6–9 °C cooler than that of the present. The entire ranges of δ18O and δD values for samples with 14C dating from 7 ka B.P to present are ?7.7‰ to ?10.2‰ and ?63‰ to ?73‰, respectively. The greater δ18O and δD enrichments of these samples indicate a period of relatively humid and warm climate in the Holocene. However, the wide ranges of δ18O (?9.0‰ to ?11.1‰) and δD (?66‰ to ?80‰) values for samples with 14C age ranging from 12 to 7 ka B.P. imply an unstable climatic condition of rapidly increasing temperature, which marks the transition from the Pleistocene to the Holocene. |
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