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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Stability of the Earth with respect to the spin axis for the last 130 million years
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Stability of the Earth with respect to the spin axis for the last 130 million years

机译：过去1.3亿年以来地球相对于旋转轴的稳定性

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摘要

Recently continental paleomagnetic data rotated into a hotspot reference frame have been used to suggest the Earth rotated 18° with respect to the spin axis at 110 Ma. We test this true polar wander (TPW) hypothesis using paleomagnetic data from widespread granitic rocks of cratonal North America. These data conflict with TPW predictions leading to rejection of the hypothesis. The calculated polar displacement is instead consistent with motion of the Atlantic hotspots during the mid-Cretaceous. This analysis suggests that the time-averaged position of the spin axis has deviated by no more than ～5° over the last 130 million yr, indicating that mantle mass heterogeneities have not changed rapidly enough to drive TPW.
机译：最近，已将大陆古地磁数据旋转到一个热点参考系中，以表明地球相对于110 Ma的自旋轴旋转了18°。我们使用来自北美洲克拉通的广泛花岗岩岩石的古磁数据测试了这种真实的极地漂移（TPW）假设。这些数据与TPW预测相冲突，导致该假设遭到拒绝。相反，计算出的极移与白垩纪中期大西洋热点的运动一致。该分析表明，自最后一个1.3亿年以来，自旋轴的时间平均位置偏离不超过〜5°，这表明地幔质量非均质性变化得不够快，无法驱动TPW。

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