摘要
地球磁场多次发生南北（正负）磁极位置的变换和白垩纪超静磁带（CNS）的异常现象，这已为大家所公认．但造成这种异常现象的原因，则是迄今未能很好解答的一个难题．应用非线性理论对地球磁极倒转和白垩纪超静磁带进行了分析，认为超静磁带事件意味着地球核幔相互作用和外核流体运动可能处于能量最低的状态，地球磁场系统通过不断地与外界交换物质和能量，维持一种空间或时间的有序结构．在121～83Ma期间，无外星撞击地球引起地磁极性倒转，可能是白垩纪超静磁带出现的原因之一．地球磁场极性的随机倒转具有混沌运动的自逆转特性，混沌理论给地磁极性倒转提出了一个简明的动力机制解释．
It is generally acknowledged that geomagnetic polarity has reversed many times in geological history and an abnormal geologic phenomenon is the Cretaceous normal superchron （CNS）. However, the causes have been unknown up to now. The nonlinear theory has been applied to analyze the phenomenon in geomagnetic polarity reversal and Cretaceous normal superchron. Cretaceous Normal Superchron implies that interaction of earth core-mantle and liquid movement in 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 outside continuously. During 121-83Ma it is a cause of occurring Cretaceous normal superchron that there is non-dynamic effect of a collision with a celestial body which bring a geomagnetic polarity reversal. Random of reversal geomagnetic polarity has the self-reversion characteristic of chaos and Chaos theory gives a simple and clear explanation for the dynamic cause of geomagnetic polarity reversal.
出处
《地球物理学进展》
CSCD
北大核心
2007年第1期68-72,共5页
Progress in Geophysics
基金
国家重点基础研究发展计划项目(2006CB701400)
国家自然科学基金项目(40672196
40172099)
地质过程与矿产资源国家重点开放实验室联合资助
关键词
非线性
地球磁极倒转
白垩纪超静磁带
nonlinearity, geomagnetic polarity reversal, Cretaceous normal superchron （CNS）
