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古地磁数据显示了在古地磁和热点参照系之间的不到1000km的运动,即100Ma(百万年)期间的真极移,它意味着地球自转轴一直是相当稳定的。这个长期的自转稳定性可以用晚中生代和新生代的大规模板块运动的缓慢变化来解释,只要俯冲带的岩石层是地幔对流导致的地幔密度不均匀性的主要部分。因此,不需要引入其他诸如自转不规则的缓慢再调整之类的机制,就可以解释所观测到的缓慢的真极移。
Palaeomagnetic data show a movement of less than 1000 km between paleomagnetic and hot-frame reference systems, a true pole shift of 100 Ma (millions of years), which means that the Earth's rotation axis has been fairly constant. This long-term stability of rotation can be explained by the slow changes in large Mesozoic and Mesozoic plate movements in the Late Mesozoic and Cenozoic as long as the subduction zone rock layer is the major part of the mantle density heterogeneity caused by mantle convection. Therefore, it is possible to explain the observed slow true pole shift without introducing other mechanisms such as slow readjusting of irregularities in rotation.