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The 'lost Inca Plateau': cause of flat subduction beneath Peru?

机译:“失去的印加高原”:秘鲁之下平坦俯冲的原因?

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摘要

Since flat subduction of the Nazca Plate beneath Peru was first recognized in the 1970s and 1980s a satisfactory explanation has eluded researchers. We present evidence that a lost oceanic plateau (Inca Plateau) has subducted beneath northern Peru and propose that the combined buoyancy of Inca Plateau and Nazca Ridge in southern Peru supports a 1500 km long segment of the downgoing slab and shuts off arc volcanism. This conclusion is based on an analysis of the seismicity of the subducting Nazca Plate, the structure and geochemistry of the Marquesas Plateau as well as tectonic reconstructions of the Pacific-Farallon spreading center 34 to 43 Ma. These restore three sub-parallel Pacific oceanic plateaus; the Austral, Tuamotu and Marquesas, to two Farallon Plate counterparts; the Iquique and Nazca Ridges. Inca Plateau is apparently the sixth and missing piece in an ensemble of 'V-shaped' hotspot tracks formed at on-axis positions. We argue the mirror image of the Inca Plateau, the Marquesas Plateau, is an ancient edifice overprinted by recent volcanism, in disagreement with the widely accepted young (< 5 Ma) hotspot model for plateau formation.
机译:自从1970年代和1980年代首次在秘鲁下方纳斯卡板块俯冲俯冲以来,研究人员就没有令人满意的解释。我们目前提供的证据表明,秘鲁北部下方俯冲了消失的海洋高原(印加高原),并提出了秘鲁南部印加高原和纳斯卡岭的合并浮力支撑着下沉板块的1500公里长段,并切断了弧形火山作用。该结论是基于对俯冲的纳斯卡板块的地震活动性,马尔萨斯高原的结构和地球化学以及太平洋至法拉隆扩张中心34至43 Ma的构造重建的分析得出的。这些恢复了三个次平行的太平洋高原;南方,图阿摩图和马克斯萨斯,送给法拉隆板块的两个对口;伊基克和纳斯卡山脊。印加高原显然是在轴上位置形成的“ V形”热点轨迹合集中的第六个,也是缺失的一块。我们认为,印加高原(马克萨斯高原)的镜像是由最近的火山喷印覆盖的古老建筑,与高原形成的广泛接受的年轻(小于5 Ma)热点模型不同。

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