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首页> 外文期刊>Geochemistry, geophysics, geosystems >Intraplate volcanism due to convective instability of stagnant slabs in the mantle transition zone
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Intraplate volcanism due to convective instability of stagnant slabs in the mantle transition zone

机译：地幔过渡带停滞平板对流不稳定性造成的板内火山作用

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摘要

The study of volcanism can further our understanding of Earth's mantle processes and composition. Continental intraplate volcanism commonly occurs above subducted slabs that stagnate in the Mantle Transition Zone (MTZ), such as in Europe, eastern China, and western North America. Here, we use two-dimensional numerical models to explore the evolution of stagnant slabs in the MTZ and their potential to sustain mantle upwellings that can support volcanism. We find that weak slabs may go convectively unstable within tens of million years. Upwellings rise out of the relatively warm underbelly of the slab, are entrained by ambient-mantle flow and reach the base of the lithosphere. The first and most vigorous upwellings rise adjacent to lateral heterogeneity within the slab. Ultimately, convective instability also acts to separate the compositional components of the slab, harzburgite, and eclogite, from each other with harzburgite rising into the upper mantle and eclogite sinking into the lower mantle. Such a physical filtering process may sustain a long-term compositional gradient across the MTZ.
机译：火山学的研究可以使我们进一步了解地球的地幔过程和组成。大陆板内火山活动通常发生在地幔过渡带（MTZ）中停滞的俯冲板之上，例如在欧洲，中国东部和北美西部。在这里，我们使用二维数值模型来探索MTZ停滞平板的演变及其在维持可以支持火山作用的地幔上升流中的潜力。我们发现，薄板在数千万年内可能对流不稳定。上升流从相对温暖的板状腹板上升，并被周围的地幔流夹带并到达岩石圈底部。第一个且最剧烈的上升流邻近平板内的横向非均质性上升。最终，对流不稳定性还起到了将板块，哈兹伯格岩和榴辉岩的组成成分彼此分离的作用，其中哈兹伯格岩上升到上地幔，而榴辉岩沉入下地幔。这样的物理滤波过程可以在整个MTZ上维持长期的成分梯度。

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