Pervasive pressure solution transfer in a quartz sand
Pervasive pressure solution transfer in a quartz sand
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石英砂中普遍存在的压力溶液转移
DOI：
10.1029/2000jb900465
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发表时间：
2001
影响因子：
--
通讯作者：
A. Revil
中科院分区：
文献类型：
--
作者：
A. Revil
在一定的温度和晶粒尺寸条件下，石英骨料通过渗透压力溶液变形的动力学可以强烈依赖于二氧化硅进入晶粒间接触的扩散率。分析了影响这一关键参数的因素（在压力解的岩石变形问题的分析中，这一参数的限制较少）。这一分析是基于最近的进展，研究二氧化硅表面，特别是在二氧化硅表面上的硅胶层的存在下进行溶解。通过重新调查的电粘性效应发生在颗粒-颗粒接触，本分析表明，在颗粒-颗粒接触的二氧化硅的扩散率可能是相对相似的，在散装孔隙水（也许1个数量级小，但不是更多）。这与Rutter [1976]之前的工作相矛盾，Rutter [1976]是许多后续论文中使用的关键参考文献，用于证明颗粒间接触处二氧化硅的扩散率极低（比游离水中二氧化硅的扩散率小5个数量级）。这一发现对沉积盆地中石英砂和砂岩的压溶变形速率具有重要意义，涉及（1）影响该过程动力学的限制步骤（溶质扩散或溶解/沉淀化学）和（2）在地质时间尺度上发生压溶变形时热力学平衡状态的存在。用粘多孔塑性模型描述石英砂中普遍压力溶液迁移的变形。该模型被证明是与当前状态的二氧化硅的表面化学的知识。此外，该模型与实验室和现场数据的对比也相当好。
The kinetics of deformation of a quartz aggregate by pervasive pressure solution can be, under certain conditions of temperature and grain size, strongly dependent upon the diffusivity of silica into the grain-to-grain contacts. An analysis of the factors affecting this key parameter (and less well constrained in the analysis of the problem of rock deformation by pressure solution) is presented. This analysis is based on recent advances on studying silica surfaces and particularly on the existence of a silica gel layer on the silica surfaces undergoing dissolution. By reinvestigating the electroviscous effect occurring at the grain-to-grain contact the present analysis shows that the diffusivity of silica at the grain-to-grain contacts is likely to be relatively similar to that in the bulk pore water (maybe 1 order of magnitude smaller but not more). This contradicts the previous work by Rutter [1976], which has been the key reference used in many subsequent papers to justify an extremely low value for the diffusivity of silica at the grain-to-grain contacts (5 orders of magnitude smaller than the diffusivity of silica in free water). This finding has dramatic implications concerning the deformation rate of quartz sands and sandstones by pressure solution in sedimentary basins with regard to (1) the limiting step affecting the kinetics of the process (diffusion of the solute or dissolution/precipitation chemistry) and (2) the existence of a thermodynamic equilibrium state when deformation by pressure solution occurs over geological timescales. A poroviscoplastic model is used to describe deformation associated with pervasive pressure solution transfer in quartz sands. This model is shown to be consistent with the current state of knowledge of the surface chemistry of silica. In addition, the comparison between this model and both laboratory and field data is rather good.
影响因子：
2.9
作者：
S. Nakashima
通讯作者：
S. Nakashima