石英结晶学优选与应用

石英集合体的结晶学优选可由位错滑移、双晶滑移、定向成核与生长等形成，其中位错滑移是塑性变形岩石中石英结晶学优选产生的最重要的机制。影响变形石英结晶学优选的因素有温度、应变速率、应变、差应力、水、复矿物岩石中各种矿物间的相互作用、初始结晶学方向等。系统总结了石英晶体变形与滑移系，结晶学优选的测量与表达，多种条件下石英的结晶学优选，以及在判断剪切方向、计算运动学涡度、判定变形温度、分析变形历史等方面的应用，并认为应用石英组构作运动学和动力学解析时需与其它微观、宏观现象相结合。

The crystallographic preferred orientation of quartz and its applications

The crystallographic preferred orientation (CPO) of quartz aggregates can be developed by dislocation glide, twin glide, and oriented nucleation and growth, among which dislocation glide is the most important mechanism. Factors that can affect quartz CPO include temperature, strain rate, strain, differential stress, content of water, interaction among minerals in polymineralic rocks, and initial orientation. This paper summarizes and discusses quartz crystal deformation and slip systems, measurements and representations of quartz CPO, CPO patterns developed under various geological environments, and quartz CPOs' applications to interpreting shear sense, calculating value of kinematic vorticity number, determining the temperature of deformation, and deciphering deformation evolution history with the conclusion that those applications of quartz CPO patterns should not be relied on exclusively.