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首页> 外文期刊>Geochemistry, geophysics, geosystems >Torsion of a cylinder of partially molten rock with a spherical inclusion: Theory and simulation
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Torsion of a cylinder of partially molten rock with a spherical inclusion: Theory and simulation

机译：具有球形夹杂物的部分熔融岩石圆柱体的扭转：理论和模拟

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摘要

The processes that are involved in migration and extraction of melt from the mantle are not yet fully understood. Gaining a better understanding of material properties of partially molten rock could help shed light on the behavior of melt on larger scales in the mantle. In this study, we simulate three-dimensional torsional deformation of a partially molten rock that contains a rigid, spherical inclusion. We compare the computed porosity patterns to those found in recent laboratory experiments. The laboratory experiments show emergence of melt-rich bands throughout the rock sample, and pressure shadows around the inclusion. The numerical model displays similar melt-rich bands only for a small bulk-to-shear-viscosity ratio (five or less). The results are consistent with earlier two-dimensional numerical simulations; however, we show that it is easier to form melt-rich bands in three dimensions compared to two. The addition of strain-rate dependence of the viscosity causes a distinct change in the shape of pressure shadows around the inclusion. This change in shape presents an opportunity for experimentalists to identify the strain-rate dependence and therefore the dominant deformation mechanism in torsion experiments with inclusions.
机译：从地幔中迁移和提取熔体的过程尚未完全了解。更好地了解部分熔融岩石的材料特性可能有助于阐明地幔中较大尺度上的熔体行为。在这项研究中，我们模拟了包含刚性球形夹杂物的部分熔融岩石的三维扭转变形。我们将计算出的孔隙率模式与最近实验室实验中发现的孔隙率模式进行比较。实验室实验表明，在整个岩石样品中均出现了富熔体带，并且包裹体周围出现了压力阴影。数值模型仅在较小的体积-剪切-粘度比（5或更低）下显示相似的富熔体带。结果与早期的二维数值模拟是一致的。但是，我们表明，与二维相比，在三个维度上更容易形成富熔体带。粘度的应变率依赖性的增加导致夹杂物周围的压力阴影的形状发生明显变化。这种形状的变化为实验人员提供了一个机会，可以确定应变率依赖性，从而确定包含夹杂物的扭转实验中的主要变形机制。

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