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Science Bulletin 2024年第3期69卷 375-381页

作者：庞洪喜张王滨吴霜叶 Theo M.Jenk Margit Schwikowski 侯书贵 Key Laboratory of Coast and Island Development of Ministry of Education School of Geography and Ocean ScienceNanjing UniversityNanjing 210023China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Department of Geology and Environmental Geosciences University of DaytonDayton OH 45469USA Laboratory of Environmental Chemistry Paul Scherrer InstituteVilligen PSI 5232Switzerland Oeschger Centre for Climate Change Research University of BernBern 3012Switzerland Frontiers Science Center for Critical Earth Material Cycling Nanjing UniversityNanjing 210023China

Understanding the impact of meltwater discharge during the final stage of the Laurentide Ice Sheet(LIS)has important implications for predicting sea level rise and climate change.Here we present a highresolution ice-core isotopic record from the central Tibetan Plateau(TP),where the climate is sensitive to the meltwater forcing,and explore possible signals of the climate response to potential LIS meltwater discharges in the early to mid-Holocene.The record shows four abrupt large fluctuations during the 7–9 ka BP(kiloannum before present),reflecting large shifts of the mid-latitude westerlies and the Indian summer monsoon(ISM)over this period,and they corresponded to possible LIS freshwater events documented in other paleoclimate records.Our study suggests that multiple rapid meltwater discharge events might have occurred during the final stage of LIS.The finding implies the possibility of rapid sea level rise and unstable climate in the transition zone between the mid-latitude westerlies and the ISM due to fast polar ice retreat under the anthropogenic global warming.

关键词： Tibetan Plateau Ice core water isotopes Meltwater events Abrupt climate change

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Geochemical Characteristics and Origin of Nuanquanzi Geothermal water in Yudaokou,Chengde,Hebei,North China

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Journal of Earth Science 2023年第3期34卷 838-856页

作者： Houyun Sun Xiaoming Sun Xiaofeng Wei Xingkai Huang Guoqiu Ke Hao Wei School of water Resources&Environment China University of GeosciencesBeijing 100083China Beijing Institute of Geology for Mineral Resources Co. Ltd.Beijing 100012China China Institute of Geo-Environment Monitoring Beijing 100081China Zhongse Jietai Geophysical Science Co. Ltd.Beijing 100012China Hebei Center for Ecological and Environmental Geology Research Hebei GEO UniversityShijiazhuang 050031China

Study on the Nuanquanzi geothermal field in the Yanshan uplift is of great significance for understanding the origin of geothermal fluid in the intracontinental orogenic belt of the fault depression basin margin in North China.The geochemical characteristics and formation mechanism of the Nuanquanzi geothermal system were elucidated by classical hydrogeochemical analysis,multi-isotopes approach(δD,δ^(18)O,δ^(13)C,δ^(87)Sr/^(86)Sr),14CAMSdating,and integrated geophysical prospecting of surface-soil radon gas measurement and CSAMT inversion.The results show that the Nuanquanzi geothermal field is a medium-low temperature convection-fault semi-enclosed geothermal system.The hydrochemical type of thermal water is primarily HCO_(3)-Na,and rich in soluble SiO_(2),F^(-)and Cl^(-).The geothermal water primarily originated from the recharging meteoric water with a maximum circulation depth of 2400-3200 m,but affected by the mixing of endogenous sedimentary water.The reservoir temperature calculated by Na-K and quartz geothermometer of the Nuanquanzi geothermal system was determined to be 73.39-92.87℃.The conduction-cooling and shallow cold-water mixing processes occurred during the parent geothermal fluid ascent to surface,and the proportion of cold-water mixing during circulation was approximately 88.3%to 92.2%.The high-anomaly radon zones matched well to the low apparentresistance areas and hiding faults,indicating that the Nuanquanzi geothermal field was dominated by a graben basin restricted by multiple faults.

关键词： geothermal water hydrogeochemistry water isotopes soil radon measurement controlled source audio-frequency magnetotelluric

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