Nonlinear Dynamic Study on Geomagnetic Polarity Reversal and Cretaceous Normal Superchron  

作　　者：SHEN Wei 

机构地区：[1]State Key Laboratory of Geo-Processes and Mineral Resources, Laboratory of Resources Environment and Management, China University of Geosciences, 29 Xueyuan Road, Beijing 100083

出　　处：《Acta Geologica Sinica(English Edition)》2007年第6期1097-1102,共6页地质学报（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2006CB701406);the National Natural Science Foundation of China(Grant Nos.40672196 and 40638041);the Laboratory of Resources Environment and Management(Grant No.GPMR0520);and the Project 111(Grant No.B07011).

摘　　要：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 superchron.The 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.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 superchron.The 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） 

分 类 号：P56[天文地球—构造地质学]