Fabric Development at the Granulite to Amphibolite Transi- tion, Parry Sound, Ontario: Implications for Deformation of the Middle to Lower Continental Crust

韧性剪切带变形组构发育已在中低级变质岩中得到了较好的研究，而麻粒岩和上角闪岩相岩石中的变形组构研究较少。由于这些级别被认为代表了中到下大陆地壳的条件，有关组构发育和流变性的信息将对理解非常深的逆冲断层非常有兴趣。这项工作将包括绘制加拿大安大略省Parry Sound地区麻粒岩到上角闪岩相的暴露剪切带图，以及随后的实验室分析，以详细研究这些剪切带中的组构和微结构发展，包括颗粒尺寸和形状分布的发展、晶格优先取向以及各向异性矿物反应地点与组构的关系。这一结果可望加深对中、下地壳变形机制和流变性的认识。

The development of deformation fabric in ductile shear zones has been well studied in low to medium-grade metamorphic rocks, however there is little available data from granulite and upper amphibolite facies rocks. As these grades are thought to represent conditions of the middle to lower continental crust, information on fabric development and rheological behavior will be of considerable interest in understanding very deep-seated thrust faults. The work will involve mapping of exposed shear zones of granulite to upper amphibolite facies in the Parry Sound region of Ontario, Canada, and subsequent laboratory analysis to examine the fabric and microstructural development in these shear zones in detail, including the development of grain size and shape distributions, lattice preferred orientations, and the relationship of anisotropic mineral reaction sites to the fabric. Results are expected to improve understanding of the deformation mechanisms and rheological properties of the lower and middle crust.