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

麻粒岩到角闪岩过渡时期的织物发展，帕里湾，安大略省：对中下部大陆地壳变形的影响

• 批准号: 8916354
• 负责人: Carol Simpson
• 金额: $ 10.19万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-15 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916354&HistoricalAwards=false
• 关键词: Fabric; Development; Granulite; Amphibolite; Transi

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.

韧性剪切带变形组构的发育 已经在中低变质岩石中得到了很好的研究， 然而，麻粒岩和上部岩石的可用数据很少， 角闪岩相岩石 因为这些等级被认为 代表了大陆中下地壳的情况， 织物开发和流变性能信息将 对理解非常深层次的 逆冲断层 这项工作将包括测绘暴露的剪切力 帕里麻粒岩-上角闪岩相带 加拿大安大略健全地区，以及随后的实验室 分析，以检查织物和微观结构的发展， 这些剪切带的细节，包括粮食的发展， 尺寸和形状分布，晶格优选取向，以及 各向异性矿物反应位点与 织物. 预计这些结果将提高对 下半部分的变形机理和流变特性 和中地壳。