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首页> 外文期刊>Geophysical Research Letters >Ridge subduction sparked reorganization of the Pacific plate-mantle system 60-50 million years ago
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Ridge subduction sparked reorganization of the Pacific plate-mantle system 60-50 million years ago

机译：里奇俯冲引发了60-50百万年前太平洋板幔系统的重组

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摘要

A reorganization centered on the Pacific plate occurred similar to 53-47million years ago. A top-down plate tectonic mechanism, complete subduction of the Izanagi plate, as opposed to a bottom-up mantle flow mechanism, has been proposed as the main driver. Verification based on marine geophysical observations is impossible as most ocean crust recording this event has been subducted. Using a forward modeling approach, which assimilates surface plate velocities and shallow thermal structure of slabs into mantle flow models, we show that complete Izanagi plate subduction and margin-wide slab detachment induced a major change in sub-Pacific mantle flow, from dominantly southward before 60Ma to north-northeastward after 50Ma. Our results agree with onshore geology, mantle tomography, and the inferred motion of the Hawaiian hot spot and are consistent with a plate tectonic process driving the rapid plate-mantle reorganization in the Pacific hemisphere between 60 and 50Ma. This reorganization is reflected in tectonic changes in the Pacific and surrounding ocean basins.
机译：以太平洋板块为中心的重组发生在53-47百万年前。已经提出了自上而下的板块构造机制，完全由Izanagi板块俯冲，而不是自下而上的地幔流动机制作为主要驱动力。由于记录了该事件的大多数洋壳均已俯冲，因此不可能基于海洋地球物理观测进行验证。使用正向建模方法将平板的表面速度和浅层热结构同化为地幔流模型，我们表明，完整的Izanagi平板俯冲和全缘板块分离引起了次太平洋地幔流的主要变化，从显着向南60Ma后向东北偏北60Ma。我们的研究结果与陆上地质学，地幔层析成像以及推断的夏威夷热点运动相吻合，并且与板块构造过程相一致，板块构造过程推动了太平洋半球在60至50Ma之间快速进行板幔重组。这种重组反映在太平洋及其周围海盆的构造变化中。

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