摘要
<正>夏威夷帝王岛链是板块运动的基石:太平洋板块在相对稳定的夏威夷地幔柱上漂移,留下一串由洋岛火山岩组成的海山链。这个岛链由北西向的夏威夷岛链和北北西向的帝王岛链组成。在约50 Ma时有一个大拐弯,被认为指示了太平洋板块的运动方向发生了一次大的转折1。但是古地磁研究发现,帝王岛链北段的底特律海山喷发时的纬度在~36?N,而夏威夷岛现今的纬度是19?N。两者相差近2000千米。因此有学者认为帝王岛链不是太平洋向北运动的产物,而是地幔柱向南运动形成的2,3。
引文
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