Rapid subduction initiation and magmatism in the Western Pacific driven by internal vertical forces.,Nature Communications

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Rapid subduction initiation and magmatism in the Western Pacific driven by internal vertical forces.
Nature Communications ( IF 14.7 ) Pub Date : 2020-04-20 , DOI: 10.1038/s41467-020-15737-4
B Maunder ₁ , J Prytulak ₂ , S Goes ₁ , M Reagan ₃

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Plate tectonics requires the formation of plate boundaries. Particularly important is the enigmatic initiation of subduction: the sliding of one plate below the other, and the primary driver of plate tectonics. A continuous, in situ record of subduction initiation was recovered by the International Ocean Discovery Program Expedition 352, which drilled a segment of the fore-arc of the Izu-Bonin-Mariana subduction system, revealing a distinct magmatic progression with a rapid timescale (approximately 1 million years). Here, using numerical models, we demonstrate that these observations cannot be produced by previously proposed horizontal external forcing. Instead a geodynamic evolution that is dominated by internal, vertical forces produces both the temporal and spatial distribution of magmatic products, and progresses to self-sustained subduction. Such a primarily internally driven initiation event is necessarily whole-plate scale and the rock sequence generated (also found along the Tethyan margin) may be considered as a smoking gun for this type of event.

中文翻译：

由内部垂直力驱动的西太平洋快速俯冲启动和岩浆活动。

板块构造需要形成板块边界。尤其重要的是俯冲的神秘开始：一块板块在另一块板块之下滑动，以及板块构造的主要驱动力。国际大洋探索计划远征352恢复了俯冲引发的连续原位记录，该活动钻探了伊豆-波宁-马里亚纳俯冲系统前弧的一段，揭示了明显的岩浆进展，时间尺度迅速（大约一百万年）。在这里，我们使用数值模型证明了这些观察结果不能通过先前提出的水平外力产生。相反，以内部垂直力为主导的地球动力学演化会产生岩浆产物的时间和空间分布，并发展为自我维持的俯冲。

更新日期：2020-04-24

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