COLLABORATIVE RESEARCH: Mechanism and Processes of Orogeny in the Crystalline Core of the North Cascades, Washington and the Southeast Coast Plutonic Complex, British Columbia

太平洋西北部由许多奇异的地体组成，这些地体从白垩纪开始就附着在大陆边缘，但组装的构造和时间存在争议。这一合作项目的更新将涉及不列颠哥伦比亚省东南海岸深成杂岩白垩纪中期造山作用的机制和过程，以及它在华盛顿州北瀑布水晶核心的延伸。待验证的造山作用模式包括块状缩短作用、俯冲推覆作用、挤压逆冲作用和岩浆增生作用。对这些模型的评估将利用矿物热压法、组构分析和锆石U-Pb年代学，并涉及造山带作为与地体吸积有关的碰撞带或作为在北美克拉通边缘发展的复杂的安第斯型岩浆弧的更广泛的观点。

The Pacific northwest consists of a number of exotic terranes that were accreted to the continental margin beginning in the Cretaceous, however the tectonics and timing of the assembly is controversial. This renewal of a collaborative project will address the mechanics and processes of mid- Cretaceous Orogeny in the southeast Coast Plutonic Complex of British Columbia and its extension in the Crystalline Core of the North Cascades of Washington. Models of orogenesis to be tested include bulk shortening, transpressive thrusting, contractional thrusting and magmatic accretion. Evaluation of these models will utilize mineral thermobarometry, fabric analysis and U-Pb Zircon geochronology and pertains to a larger view of the orogen as either a collisional welt related to terrane accretion, or as a complex Andean-type magmatic arc developed on the edge of the North American craton.