A Middle Pleistocene Glaciation Record from Lacustrine Sediments in the Western Tibetan Plateau and Discussion on Climate Change  

作　　者：ZHAO Zhenming JI Wenhua FU Chaofeng 

机构地区：[1]Xi'an Center,China Geological Survey,Xi'an 710054,China [2]Key Laboratory of Western Mineral Resources and Geological Engineering,Ministry of Education of China and Chang'an University,Xi'an 710054,China [3]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth and Environment,CAS,Xi'an 710075,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第2期623-635,共13页地质学报（英文版）

基　　金：supported by grants from the China Geological Survey(Grant Nos.1212010610102,DD20190065).

摘　　要：The Tibetan Plateau is an important area for studying global climate change,but the answers to many scientific problems remain unknown.Here,we present new information from the lacustrine sedimentary record in the western Tibetan Plateau,related to the third most-recent glaciations.Continuous sediment data,including sporopollen,particle size,total organic carbon,mass susceptibility,CaCO_(3),CaSO_(4),BaSO_(4)contents and chronological data,were reconstructed and revealed that climate and environmental conditions obviously and distinctly changed between 600 and 700 thousand years ago.In comparison,the data obtained from the Guliya ice core in this area also corresponds to the global glacial climatic characteristics recorded in basin sediments in the eastern and southeastern regions of the plateau and to the information obtained from ice cores in the Antarctic and Arctic regions.In this study,we conclude that the main reason for the glaciations and new tectonic movement must be a geomagnetic polarity reversal 774 thousand years ago(from Matuyama to Brunhes).Indeed,the results of this study suggest that the described reversal event might have influenced the current global climate pattern and will continue to impact climatic changes in the future.

关 键 词：glacial record global climate change geomagnetic polarity reversal middle Pleistocene western Tibetan Plateau 

分 类 号：P512.2[天文地球—地质学] P534.631