Quartz c‐axis fabrics in natural mylonites can vary to such an extent that they apparently give opposite senses of shear in a single thin section. Many hypotheses have been invoked to explain this. Here, we couple our self‐consistent multiscale approach for flow partitioning with the viscoplastic self‐consistent model for c‐axis fabric simulation to investigate quartz c‐axis fabric development. Quartz aggregates are regarded as microscale Eshelby inhomogeneities embedded in a macroscale medium whose effective rheology is represented by a hypothetical homogeneous equivalent medium which is assumed to be rheologically isotropic or has a planar anisotropy. We reproduced the observed quartz c‐axis fabrics. We found that although the microscale flow fields are distinct from one another and from the macroscale flow, the microscale vorticity in every inhomogeneity has the same sense as the macroscale vorticity. This implies that one can use the average of the microscale vorticity axes determined through the crystallographic vorticity axis analysis to obtain the macroscale vorticity axis. However, quartz c‐axis fabrics cannot be used to determine the vorticity number where flow partitioning is significant.

中文翻译：

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多尺度数值模拟研究流动分配对石英c轴织物发展的意义

天然mylonite中的石英c轴织物的变化程度可能会使其在单个薄片中明显产生相反的剪切感。许多假设被用来解释这一点。在这里，我们将用于流分配的自洽多尺度方法与用于c轴织物模拟的粘塑性自洽模型相结合，以研究石英c轴织物的开发。石英聚集体被认为是嵌入在宏观介质中的微量埃舍尔比不均匀性，其有效流变性由假设的均质等效介质表示，假定均质等效介质被假定为流变各向同性或具有平面各向异性。我们复制了观察到的石英c轴织物。我们发现，尽管微观尺度的流场与宏观尺度的流场彼此不同，每种不均匀性中的微观旋涡具有与宏观旋涡相同的意义。这暗示着可以使用通过晶体学涡度轴分析确定的微尺度涡度轴的平均值来获得宏观涡旋轴。但是，石英c轴织物不能用于确定流量分配显着的涡数。