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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 >Are the Pacific and Indo-Atlantic hotspots fixed? Testing the plate circuit through Antarctica
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Are the Pacific and Indo-Atlantic hotspots fixed? Testing the plate circuit through Antarctica

机译：太平洋和印度洋-大西洋热点是否固定？通过南极测试板电路

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It is often assumed that hotspots are fixed relative to one another and thus constitute a global reference frame for measuring absolute plate motions and true polar wander. But it has long known that the best documented hotspot track, the Hawaiian-Emperor chain, is inconsistent with the internally coherent tracks left by the Indo-Atlantic hotspots. This inconsistency is due either to unquantified motions within the plate circuit linking the Pacific with other plates, for example, between East and West Antarctica, or relative motion between the Hawaiian-Emperor and Indo-Atlantic hotspots. Analysis of recent paleomagnetic results from Marie Byrd Land in West Antarctica confirms that there has been post-100 Ma motion between West Antarctica (Maria Byrd Land) and East Antarctica. However, incorporation of this motion into the plate circuit does not account for the Cenozoic hotspot discrepancy. Comparison of an updated inventory of Pacific and non-Pacific paleomagnetic data does not show a significant systematic discrepancy, which along with other observations, indicates that missing plate boundaries and other errors in the plate circuit play a relatively small role in the hotspot inconsistency. We conclude that most of the apparent motion between the Hawaiian-Emperor and Indo-Atlantic hotspots is real. The best-estimate average drift rate between these sets of hotspots is approximately 25 mm/yr since 65 Ma, ignoring errors in the plate circuit and a small contribution from Cenozoic motions between East and West Antarctica.
机译：通常认为，热点彼此之间是固定的，因此构成了一个用于测量绝对板块运动和真实极地漂移的全局参考系。但是，人们早就知道，记录最完整的热点轨迹，即夏威夷皇帝链与印度-大西洋热点留下的内部连贯轨迹不一致。这种不一致是由于连接太平洋和其他板块的板块回路内未量化的运动引起的，例如南极东西方之间的运动，或者夏威夷帝国和印度洋-大西洋热点之间的相对运动。对南极西部的玛丽·伯德（Marie Byrd Land）最近的古磁结果进行的分析证实，西极（玛丽亚·伯德（Maria Byrd Land））和南极东部之间存在100 Ma后运动。但是，将此运动并入极板回路并不能解决新生代热点差异。比较太平洋和非太平洋古地磁数据的最新清单不会显示出明显的系统差异，这与其他观察结果一起表明，板极边界的缺失和板极电路中的其他误差在热点不一致方面的作用相对较小。我们得出的结论是，夏威夷皇帝和印度-大西洋热点之间的大多数明显运动都是真实的。自65 Ma以来，这两组热点之间的最佳估计平均漂移率约为25 mm / yr，这忽略了板块回路中的误差以及南极东西方之间新生代运动的微小贡献。

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