Study of Shear Zones and Associated Intrusions, Coastal Orogen, British Columbia and Alaska

剪切带和相关侵入、沿海造山带、不列颠哥伦比亚省和阿拉斯加的研究

• 批准号: 8903885
• 负责人: Maria Crawford
• 金额: $ 9.89万
• 依托单位: Bryn Mawr College
• 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: 1989-07-01 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8903885&HistoricalAwards=false
• 关键词: Study; Shear; Zones; Associated; Intrusions

Mid to deep levels of continental crust are exposed in the collisional orogen of the Coast Crystalline Complex of South- eastern Alaska and adjacent British Columbia. Crustal thicken- ing and metamorphisms as well as later uplift were accomplished by movement of crustal blocks along regional shear zones and accompanied by emplacement of tabular bodies of intrusive igneous rocks. This project aims to determine the timing of shear zone formation relative to metamorphism and igneous intrusion. The deformation mechanisms, amount of shear strain, sense of displacement and the P and T of the deformation will be obtained by a combination of detailed field and microstructural studies, fluid inclusion and isotopic studies. Results will evaluate the role of fluids, magma and hydrothermal, in shear zone initiation, movement and closure and will be of considerable utility in understanding crustal evolution in orogenic zones generally.

大陆地壳的中深层暴露在 南太平洋海岸结晶杂岩碰撞造山带 阿拉斯加东部和邻近的不列颠哥伦比亚省。 地壳运动- 完成了挤压变质作用和后期的隆升作用 地壳块体沿着区域剪切带运动， 伴随着侵入火成岩的板状体的侵位 岩石化学分析方法 本项目旨在确定剪切带出现的时间 与变质作用和岩浆侵入作用有关。 的 变形机制，剪应变量，应变方向 位移和变形的P和T 通过结合详细的现场和微观结构研究， 流体包裹体和同位素研究。 结果将评估 流体、岩浆和热液在剪切带形成中的作用， 运动和关闭，并将在相当大的效用， 对造山带地壳演化的一般认识。