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

在中低变质岩中，韧性剪切带变形组构的发育已得到较好的研究，但在麻粒岩和上角闪岩相岩中，塑性剪切带变形组构的研究较少。由于这些等级被认为代表了中下大陆地壳的状况，因此有关构造发育和流变行为的信息将对了解非常深的逆冲断层具有相当大的兴趣。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，以及随后的实验室分析，以详细检查这些剪切带的结构和微观结构发展，包括颗粒大小和形状分布的发展、晶格优选方向、以及各向异性矿物反应位点与织物的关系。研究结果有望提高对下地壳和中地壳变形机制和流变特性的认识。

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.