U-Pb Geochronologic Study of Allochthonous Paleozoic-Early Mesozoic Terranes: San Juan Islands to the Okanagan Valley,Washington and British Columbia

北美科迪勒拉的许多地体包含古生代弧形和盆地组合，古地理起源不明。标准的岩相和生物地理分析并不能最终区分出那些起源于北美边缘的地体和那些经历了更大运移的地体。该项目将扩展和开发一种很有前途的新技术，以帮助对这些碎屑锆石中发现的碎屑来源进行指纹识别，这可能会提供主要前寒武纪克拉通的独特特征，从而将本地派生的地体与长期旅行的异地地体分开。这项工作将包括在太平洋西北部的几个地体进行广泛采样和单晶锆石年龄测定。这些结果将有助于建立数据库，并有助于了解大陆边缘古生代弧形和盆地层序的对比、古地理背景和位移史。

Many terranes in the North American Cordillera contain Paleozoic arc and basinal assemblages of uncertain paleogeographic origin. Standard facies and biogeographic analysis have not been able to conclusively separate those terranes that originated along the North American margin from those that experienced greater transport. This project will expand and develop a promising new technique to help fingerprint the source of detritus now found in these detrital zircons may provide a unique signature of major precambrian cratons that would allow the separation of locally derived terranes from long-traveled allochthonous ones. The work will consist of extensive sampling in several terranes in the Pacific Northwest and single-crystal zircon age determination. Results will help build a data base and will contribute to understanding the correlation, paleogeographic setting and displacement history of Paleozoic arc and basinal sequences along the continental margin.