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首页> 外文期刊>Nature geoscience >Changbaishan volcanism in northeast China linked to subduction-induced mantle upwelling
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Changbaishan volcanism in northeast China linked to subduction-induced mantle upwelling

机译：中国东北的长白山火山活动与俯冲诱发的地幔上升有关

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Volcanism that occurs far from plate margins is difficult to explain with the current paradigm of plate tectonics. The Changbaishan volcanic complex, located on the border between China and North Korea, lies approximately 1,300 km away from the Japan Trench subduction zone and is unlikely to result from a mantle plume rising from a thermal boundary layer at the base of the mantle. Here we use seismic images and three-dimensional waveform modelling results obtained from the NECESS Array experiment to identify a slow, continuous seismic anomaly in the mantle beneath Changbaishan. The anomaly extends from just below 660 km depth to the surface beneath Changbaishan and occurs within a gap in the stagnant subducted Pacific Plate. We propose that the anomaly represents hot and buoyant sub-lithospheric mantle that has been entrained beneath the sinking lithosphere of the Pacific Plate and is now escaping through a gap in the subducting slab. We suggest that this subduction-induced upwelling process produces decompression melting that feeds the Changbaishan volcanoes. Subductioninduced upwelling may also explain back-arc volcanism observed at other subduction zones.
机译：用板块构造的当前范式很难解释远离板块边缘发生的火山活动。长白山火山群位于中国与朝鲜之间的边界，距日本海沟俯冲带约1300公里，不太可能是由地幔底部热边界层上的地幔羽所致。在这里，我们使用地震图像和从NECESS阵列实验获得的三维波形建模结果来识别长白山下地幔中的缓慢，连续地震异常。异常从正好在660 km以下的深度延伸到长白山以下的地表，并发生在停滞的俯冲太平洋板块的缝隙内。我们认为，该异常代表了已被夹带在太平洋板块下沉岩石圈下面的热和浮力的岩石圈以下的地幔，现在正在通过俯冲板中的缝隙逸出。我们认为，这种俯冲诱发的上升流过程会产生减压融化，并注入长白山火山。俯冲引起的上升流也可能解释了在其他俯冲带观测到的弧后火山活动。

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