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

北美科迪勒拉地区的许多地体含有古地理起源不确定的古生代弧和盆地组合。标准的相和生物地理分析还不能最终地将那些起源于北美边缘的地体与那些经历了更大运输的地体区分开来。该项目将扩展和开发一种有前途的新技术，以帮助识别这些碎屑锆石中的碎屑来源，这些碎屑锆石可能为主要的前寒武纪克拉通提供独特的特征，从而将本地衍生的地体与长途旅行的异域地体分离开来。这项工作将包括在太平洋西北部的几个地块进行广泛的采样和单晶锆石年龄测定。研究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.