Collaborative Research: Deformation of Layer Silicates

这是一个合作项目，通过三轴变形实验来研究硅酸盐片的变形，主要是普通云母，旨在测量（001）位错滑动所需的临界分解剪切应力，温度至700℃，压力至400 MPa。结合微观结构（光学和电子显微镜）和微观化学（电子探针和红外吸收）研究来确定主要滑移方向及其与晶体化学和结构的依赖关系。云母的应力-应变关系的确定将直接应用于大陆岩石圈构造的屈服包络、韧性剪切带和脆性断裂的应变局部化机制以及含云母变质构造岩。此外，这项研究应该导致对矿物中位错滑动的更深入的理解，因为它受到单个矿物群中晶体化学和结构的重大变化的影响。

This is a collaborative project to investigate the deformation of sheet silicates, principally the common micas, by means of triaxial deformation experiments designed to measure the critically resolved shear stresses required for (001) dislocation glide at temperatures to 700oC and pressures to 400 MPa, combined with microstructural (optical and electron microscopy) and micorchemical (electron microprobe and IR absorption) studies to determine the principal slip directions and their dependencies upon crystal chemistry and struecture. The determination of the stress-strain relations of micas will have direct applications to yield envlopes constructed the continental lithosphere, to the mechanisms of strain localization along ductile shear zones and brittel faults, and to mica-bearing metamorphic tectonites. In addition, this study should lead to a deeper understanding of dislocation glide in minearls, as it is influenced by signicicant changes in crystal chemistry and structure within a single mineral group.