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Mesozoic subducted slabs under Siberia

机译：西伯利亚地区中生代俯冲板

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Recent results from seismic tomography demonstrate that subducted oceanic lithosphere can be observed globally as slabs of relatively high seismic velocity in the upper as well as lower mantle. The Asian mantle is no exception, with high-velocity slabs being observed downwards from the west Pacific subduction zones under the Kurile Islands, Japan and farther south, as well as under Asia's ancient Tethyan margin. Here we present evidence for the presence of slab remnants of Jurassic age that were subducted when the Mongol-Okhotsk and Kular-Nera oceans closed between Siberia, the combined Mongolia-North China blocks and the Omolon block. We identify these proposed slab remnants in the lower mantle west of Lake Baikal down to depths of at least 2,500 km, where they join what has been interpreted as a 'graveyard' of subducted lithosphere at the bottom of the mantle. Our interpretation implies that slab remnants in the mantle can still be recognized some 150 million years or more after they have been subducted and that such structures may be useful in associating geodynamic to surface-tectonic processes.
机译：地震层析成像的最新结果表明，俯冲的海洋岩石圈可以在上地幔和下地幔中以相对较高地震速度的平板观测到。亚洲地幔也不例外，从千岛群岛，日本和更南端的西太平洋俯冲带向下以及在亚洲古老的特提斯边缘下观察到了高速平板。在这里，我们提供的证据表明，当蒙古-鄂霍次克海域和库拉尔-尼拉海域在西伯利亚，蒙古-华北联合体和奥莫伦区块之间关闭时，侏罗纪遗留的板状残余被俯冲了。我们在贝加尔湖以西的下地幔中发现了这些拟议的板状残余物，其深度至少为2500公里，在这里它们被认为是地幔底部俯冲岩石圈的“墓地”。我们的解释意味着，地幔中的板状残余物在被俯冲后约1.5亿年或更久之后仍然可以被识别，并且这种结构可能有助于将地球动力学与地表构造过程联系起来。

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