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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 >Achieving complete reaction while the solid volume increases: Anumerical model applied to serpentinisation
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Achieving complete reaction while the solid volume increases: Anumerical model applied to serpentinisation

机译：在固体体积增加的同时实现完全反应：适用于蛇形素的麻木模型

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Solid volume increases during the hydration of mantle rocks. The fluid pathways necessary to feed the reaction front with water can be filled by the low density reaction products. As a result, the reaction front dries out and the reaction stops at low reaction progress. This process of porosity clogging is generally predicted to dominate in reactive transport models, even when processes such as reaction-induced fracturing are considered. These predictions are not consistent with observations at mid-ocean ridges where dense mantle rocks can be completely replaced by low density serpentine minerals. To solve this issue, we develop a numerical model coupling reaction, fluid flow and deformation. High extents of reaction can only be achieved when considering that the increase in solid volume during reaction is accommodated through deformation rather than porosity clogging. The model can generate an overpressure that depends on the extent of reaction and on the boundary conditions. This overpressure induces viscoelastic compaction that limits the extent of the reaction. The serpentinisation rate is therefore controlled by the accommodation of volume change during reaction, and thus by deformation, either induced by the reaction itself or by tectonic processes. (C) 2021 Elsevier B.V. All rights reserved.
机译：在地幔岩石水合作用期间，固体体积增加。向反应前沿供水所需的流体通道可由低密度反应产物填充。结果，反应前沿变干，反应在低反应进度时停止。在反应传输模型中，即使考虑了反应诱导压裂等过程，通常也会预测这种孔隙率堵塞过程占主导地位。这些预测与大洋中脊的观测结果不一致，在那里，密集的地幔岩可以完全被低密度蛇纹石矿物所取代。为了解决这个问题，我们建立了一个耦合反应、流体流动和变形的数值模型。只有考虑到反应过程中固体体积的增加是通过变形而不是孔隙率堵塞来调节的，才能实现高程度的反应。该模型可以产生超压，这取决于反应程度和边界条件。这种超压会导致粘弹性压实，从而限制反应的范围。因此，蛇纹石化速率受反应过程中体积变化的调节，以及由反应本身或构造过程引起的变形控制。（c）2021爱思唯尔B.V.保留所有权利。

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