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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Deformation across the mantle transition zone: A theoretical mineral physics view
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Deformation across the mantle transition zone: A theoretical mineral physics view

机译：在地幔过渡区的变形：理论矿物质视图

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The dynamics of the Earth's mantle is still poorly constrained due to the lack of understanding the transfer of matter between the upper and the lower mantle and their convective vigor. The transition zone (TZ) might play a crucial role as the interface connecting the upper to the lower mantle. Here, we examine the rheology of the main TZ minerals, wadsleyite, ringwoodite and majorite garnet based on a mineral physics approach. Using the results of lattice friction modeling and dislocation glide mobilities together with the available data on self-diffusion in the TZ minerals, we quantify their plastic deformation by diffusion and dislocation creep from theoretical plasticity models. We show that pure climb creep is expected to contribute to the plasticity of the TZ without the need of significant diffusion-related hydrolytic weakening, matching well the geophysical observations. Our model results predict that crystallographic preferred orientations (CPO) might only develop along with stress concentrations as present around cold subducting slabs which can be locally weaker than the surrounding TZ despite their lower temperatures. (C) 2020 The Author(s). Published by Elsevier B.V.
机译：由于缺乏了解上下地幔之间的物质及其对流活力，地球的地幔的动态仍然受到严重的限制。过渡区（TZ）可能会发挥关键作用作为连接较低地幔的界面。在这里，我们根据矿物质法的方法检查主要TZ矿物质，Wadsleyite，Ringwoodite和Mignite Garnet的流变学。使用晶格摩擦模型和脱位滑动迁移的结果与TZ矿物质中的自传的可用数据一起，我们通过从理论塑性模型的扩散和位错蠕变量化它们的塑性变形。我们表明，预计纯攀爬蠕变将有助于TZ的可塑性，而无需显着与扩散相关的水解弱化，匹配地球物理观察。我们的模型结果预测，结晶优选取向（CPO）可能仅与围绕冷底板板的应力浓度一起开发，这在诸如温度下方的围绕TZ可以是局部弱的。 （c）2020提交人。由elsevier b.v出版。

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