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Nonlinear Dynamic Study on geomagnetic polarity reversal and Cretaceous Normal Superchron

Acta Geologica Sinica(English Edition) 2007年第6期81卷 1097-1102页

作者： SHEN Wei State Key Laboratory of Geo-Processes and Mineral Resources Laboratory of Resources Environment and Management China University of Geosciences 29 Xueyuan Road Beijing 100083

It is generally acknowledged that geomagnetic polarity has reversed many times in geological history and an abnormal geologic phenomenon is the Cretaceous normal superchron. However, the causes have been unknown up to now. The nonlinear theory has been applied to analyze the phenomenon in geomagnetic polarity reversal and the Cretaceous normal superchron. The Cretaceous normal superchron implies that interaction of the Earth＇s core-mantle and liquid movement in the outer core may be the lowest energy state and the system of Earth magnetic field maintains a sort of temporal or spatial order structure by exchanging substance and energy in the outside continuously. During 121-83 Ma, there was no impact of a celestial body that would result in a geomagnetic polarity reversal, which may be a cause for occurrence of the Cretaceous normal *** randomness of geomagnetic polarity reversal has the self-reversion characteristic of chaos and the chaos theory gives a simple and clear explanation for the dynamic cause of the geomagnetic polarity reversal.

关键词： nonlinearity geomagnetic polarity reversal Cretaceous normal superchron (CNS)

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

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 623-635页

作者： ZHAO Zhenming JI Wenhua FU Chaofeng Xi'an Center China Geological SurveyXi'an 710054China Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of Education of China and Chang'an UniversityXi'an 710054China State Key Laboratory of Loess and Quaternary Geology Institute of Earth and EnvironmentCASXi'an 710075China

The Tibetan Plateau is an important area for studying global climate change,but the answers to many scientific problems remain ***,we present new information from the lacustrine sedimentary record in the western Tibetan Plateau,related to the third most-recent *** 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 *** 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 *** 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

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