Effects of orientation on the diffusive properties of fluid-filled grain boundaries during pressure solution
Effects of orientation on the diffusive properties of fluid-filled grain boundaries during pressure solution
复制标题
取向对压溶过程中充满流体的晶界扩散特性的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
C. Peach
中科院分区：
文献类型：
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作者：
R. Noort;C. Spiers;C. Peach
岩石材料压溶研究中的一个未解决的问题是晶界结构和扩散性质对相邻晶粒晶格相互取向的依赖性。我们报告的电气测量产生不同取向的岩盐玻璃和岩盐岩盐接触加载在盐水的存在下的扩散率。岩盐-玻璃接触实验表明了岩盐的压溶作用和岩盐晶格取向对晶界输运的影响。尸检观察表明，在岩盐结构的周期性键链控制的取向依赖的晶界织构。这种织构决定了压溶过程中的晶界结构和性能。在岩盐-岩盐实验中，颈状生长发生，其速率取决于扭曲取向差。结果表明，压溶变形可能导致晶格择优取向的发展，和多矿物岩石可能会更快地变形在较低的应力比单矿物岩石。
An unresolved issue in the study of pressure solution in rock materials is the dependence of grain boundary structure and diffusive properties on the mutual orientation of neighbouring grain lattices. We report electrical measurements yielding the diffusivity of differently oriented halite–glass and halite–halite contacts loaded in the presence of brine. The halite–glass contact experiments show pressure solution of the halite and an effect of halite lattice orientation on grain boundary transport. Post-mortem observations show an orientation-dependent grain boundary texture controlled by the periodic bond chains in the halite structure. It is inferred that this texture determines the internal grain boundary structure and properties during pressure solution. In the halite–halite experiments neck-growth occurred, its rate depending on twist-misorientation. The results imply that deformation by pressure solution may lead to lattice-preferred orientation development, and that polymineralic rocks may deform faster at lower stresses than monomineralic rocks.