Abstract

The slowdown of pressure solution creep has been thought to be caused by stress redistribution. This study presents a fresh view towards this creep behaviour. Basically, two rate-limiting mechanisms come into play amid pressure solution creep: (1) stress redistribution across expanding inter-granular contacts and (2) solute accumulation in the water film. Because non-hydrostatic dissolution occurs under open system conditions, solute accumulation in the water film is constrained by the ensuing solute transport process. Relying on the matter exchange across the contact surface boundary, the active processes in the voids, e.g., solute migration and deposition, affect pressure solution creep. Based upon the above, we sum up two requirements that have to be met for achieving chemical compaction equilibrium: (1) the Gibbs free energy of reaction, i.e., the driving force of non-hydrostatic dissolution process, gets depleted and (2) the concentration gradient between the water film and surrounding pore water vanishes.

Highlights

• The slowdown of pressure solution creep is a combined result of stress migration across contacts and solute accumulation in the water film.

• Matter exchange with the surroundings inhibits solute accumulation in the water film.

• This article identifies two prerequisites that need to be fulfilled for achieving chemical compaction equilibrium.

中文翻译：

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哪个过程导致压力解蠕变减慢

摘要

压力溶液蠕变的减慢被认为是由应力重新分布引起的。这项研究为这种蠕变行为提供了新的观点。基本上，在压力溶液蠕变过程中，有两种限速机制起作用：（1）应力在整个扩展的晶间接触中重新分布，以及（2）溶质在水膜中的积累。由于在开放系统条件下会发生非静水溶解，因此随后的溶质传输过程会限制溶质在水膜中的积累。依靠跨接触面边界的物质交换，空隙中的活性过程（例如溶质迁移和沉积）会影响压力溶液的蠕变。基于上述，我们总结了达到化学压缩平衡所必须满足的两个要求：（1）反应的吉布斯自由能，即

强调

• 压力溶液蠕变的减慢是应力跨接触迁移和溶质在水膜中累积的综合结果。

• 与周围环境的物质交换会抑制溶质在水膜中的积累。

• 本文确定了实现化学压缩平衡所需满足的两个先决条件。