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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >Southwest Pacific Absolute Plate Kinematic Reconstruction Reveals Major Cenozoic Tonga‐Kermadec Slab Dragging
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Southwest Pacific Absolute Plate Kinematic Reconstruction Reveals Major Cenozoic Tonga‐Kermadec Slab Dragging

机译：西南太平洋绝对板块的运动学重建揭示了主要的新生代汤加-克马德茨平板拖曳

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摘要

Tectonic plates subducting at trenches having strikes oblique to the absolute subducting plate motion undergo trench‐parallel slab motion through the mantle, recently defined as a form of “slab dragging.” We investigate here long‐term slab‐dragging components of the Tonga‐Kermadec subduction system driven by absolute Pacific plate motion. To this end we develop a kinematic restoration of Tonga‐Kermadec Trench motion placed in a mantle reference frame and compare it to tomographically imaged slabs in the mantle. Estimating Tonga‐Kermadec subduction initiation is challenging because another (New Caledonia) subduction zone existed during the Paleogene between the Australia and Pacific plates. We test partitioning of plate convergence across the Paleogene New Caledonia and Tonga‐Kermadec subduction zones against resulting mantle structure and show that most, if not all, Tonga‐Kermadec subduction occurred after ca. 30 Ma. Since then, Tonga‐Kermadec subduction has accommodated 1,700 to 3,500 km of subduction along the southern and northern ends of the trench, respectively. When placed in a mantle reference frame, the predominantly westward directed subduction evolved while the Tonga‐Kermadec Trench underwent ~1,200 km of northward absolute motion. We infer that the entire Tonga‐Kermadec slab was laterally transported through the mantle over 1,200 km. Such slab dragging by the Pacific plate may explain observed deep‐slab deformation and may also have significant effects on surface tectonics, both resulting from the resistance to slab dragging by the viscous mantle.
机译：在具有相对于绝对俯冲板运动倾斜的走向的沟槽处俯冲的构造板块通过地幔经历与沟槽平行的平板运动，最近被定义为“平板拖曳”的形式。我们在此研究了由太平洋绝对板块运动驱动的汤加-克马德茨俯冲系统的长期板岩拖曳组件。为此，我们开发了汤加-克马德克海沟运动的运动学复原方案，该运动位于地幔参考系中，并将其与地幔中的层析成像平板进行了比较。估算汤加-克马德克俯冲带的开始具有挑战性，因为在澳大利亚和太平洋板块之间的古近纪存在另一个（新喀里多尼亚）俯冲带。我们测试了在古近纪新喀里多尼亚和汤加-克马德克俯冲带上板块汇聚的分区，以对抗由此形成的地幔结构，结果表明，汤加-克马德茨俯冲大部分（如果不是全部）发生在大约１９９８年之后。 30麻从那时起，汤加-克马德克俯冲带分别在海沟的南端和北端提供了1,700至3500公里的俯冲作用。当放置在地幔参考系中时，主要是向西的俯冲发生了演变，而汤加-克马德茨海沟经历了大约1200公里的向北绝对运动。我们推断整个汤加-凯马德茨板块横向穿过地幔运输了1200多公里。由太平洋板块造成的板坯拖拉可能解释了观察到的深板坯变形，并且可能对表面构造也有重大影响，这两者都是由于对粘性地幔板坯拖拉的抵抗所致。

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