Abstract The vorticity axis of deformation of a shear zone is a rotational axis controlled by the relative movement of its boundaries. When characterized, it is a reliable tool to determine the ductile flow geometry (monoclinic general, monoclinic transpressive, or triclinic) and an asset to identify the kinematics of complex oblique collisions. Advancements in analysis of electron backscattered diffraction (EBSD) maps now permit inference of vorticity axes – known as crystallographic vorticity axes (CVAs) – from the intragranular lattice orientation dispersion of strain-bearing minerals. However, natural shear zones may preserve a record of multiple shear events with contrasting kinematics and it is not understood to which extent the quartz lattice may preserve a kinematic record through multiple deformation events. Herein, we characterize the finite flow kinematic record produced during reactivation of the Eastern Highlands shear zone (EHSZ), in an oblique collision within the Canadian Appalachians. We integrate field and thin section observations, quartz lattice preferred orientations, EBSD maps, and grain classification, leading to a new method to determine and compare CVA within relict and recrystallized quartz grains. Using this method, we were able to conclude that the EHSZ was reactivated in an heterogenous monoclinic flow environment.

中文翻译：

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剪切带再活化过程中流动运动学的晶内涡度记录

摘要 剪切带变形涡轴是受其边界相对运动控制的旋转轴。表征后，它是确定延展性流动几何形状（单斜流、单斜压流或三斜流）的可靠工具，也是识别复杂斜向碰撞运动学的资产。电子背散射衍射 (EBSD) 地图分析的进步现在允许从应变矿物的晶内晶格取向分散推断涡度轴 - 称为晶体涡度轴 (CVA)。然而，自然剪切带可以保留具有对比运动学的多次剪切事件的记录，并且不了解石英晶格可以在多大程度上通过多次变形事件保留运动学记录。在此处，我们描述了在加拿大阿巴拉契亚山脉的一次斜向碰撞中东部高地剪切带 (EHSZ) 重新激活过程中产生的有限流动运动记录。我们整合了现场和薄片观察、石英晶格择优取向、EBSD 图和晶粒分类，从而形成了一种确定和比较残余和再结晶石英晶粒内 CVA 的新方法。使用这种方法，我们能够得出结论，EHSZ 在异质单斜流环境中被重新激活。导致了一种确定和比较残余和再结晶石英颗粒内 CVA 的新方法。使用这种方法，我们能够得出结论，EHSZ 在异质单斜流环境中被重新激活。导致了一种确定和比较残余和再结晶石英颗粒内 CVA 的新方法。使用这种方法，我们能够得出结论，EHSZ 在异质单斜流环境中被重新激活。