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Rapid change in drift of the Australian plate records collision with Ontong Java plateau

机译：澳大利亚板块漂移的快速变化记录了与Ontong Java高原的碰撞

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摘要

The subduction of oceanic plateaux, which contain extraordinarily thick basaltic crust and are the marine counterparts of continental flood-basalt provinces, is an important factor in many current models of plate motion and provides a potential mechanism for triggering plate reorganization. To evaluate such models, it is essential to decipher the history of the collision between the largest and thickest of the world's oceanic plateaux, the Ontong Java plateau, and the Australian plate, but this has been hindered by poor constraints for the arrival of the plateau at the Melanesian trench. Here we present ~(40)Ar-~(39)Ar geochronological data on hotspot volcanoes in eastern Australian that reveal a strong link between collision of the Greenland-sized Ontong Java plateau with the Melanesian arc and motion of the Australian plate. The new ages define a short-lived period of reduced northward plate motion between 26 and 23 Myr ago, coincident with an eastward offset in the contemporaneous tracks of seamount chains in the Tasman Sea east of Australia. These features record a brief westward deflection of the Australian plate as the plateau entered and choked the Melanesian trench 26 Myr ago. From 23 Myr ago, Australia returned to a rapid northerly trajectory at roughly the same time that southwest-directed subduction began along the Trobriand trough. The timing and brevity of this collisional event correlate well with offsets in hotspot seamount tracks on the Pacific plate, including the archetypal Hawaiian chain, and thus provide strong evidence that immense oceanic plateaux, like the Ontong Java, can contribute to initiating rapid change in plate boundaries and motions on a global scale.
机译：大洋俯冲带的俯冲带包含超厚的玄武质地壳，是大陆性洪泛玄武岩省的海洋对应物，是目前许多板块运动模型中的重要因素，并提供了触发板块重组的潜在机制。为了评估这样的模型，必须破译世界上最大和最厚的海洋高原，Ontong Java高原和澳大利亚板块之间的碰撞历史，但是由于高原到达的限制条件较弱，所以这受到了阻碍。在美拉尼西亚海沟。在这里，我们介绍了澳大利亚东部热点火山的〜（40）Ar-〜（39）Ar年代学数据，揭示了格陵兰大小的安通爪哇高原与美拉尼西亚弧的碰撞与澳大利亚板块运动之间的紧密联系。新时代定义了短暂的时间减少，在26至23 Myr之前，北板块运动减少了，这与澳大利亚东部塔斯曼海同时期海山链的东移相吻合。这些特征记录了高原在26 Myr之前进入并阻塞美拉尼西亚海沟时澳大利亚板块向西的短暂偏转。从23 Myr以前，澳大利亚大致在Trobriand槽开始向西南方向俯冲的同时返回了迅速的北移轨迹。这一碰撞事件的时机和简洁性与太平洋板块（包括原型夏威夷链）上的热点海山轨道的偏移量有很好的相关性，因此有力的证据证明了巨大的海洋高原（如Ontong Java）可以促进板块的快速变化。全球范围的边界和运动。

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