Tectonostratigraphic and Geochronological Analysis of the Alexander-Taku Terrane Boundary, Cleveland Peninsula to Cape Fox Area, Southern SE Alaska

阿拉斯加东南部的亚历山大-塔库地体边界代表了北美科迪勒拉地区主要的构造增生缝合之一。前人的工作表明，该界线由一条主要的西向冲断带组成，该冲断带形成于白垩纪中期，与两个地体的毗邻位置和海岸深成杂岩的区域深成作用的开始有关。这一更新项目将完成对冲断带结构及其与深成岩的关系的详细分析，以及对沿地体边界的地层单位和沉积关系的描述。实验室分析将包括铅/铀锆石和Nd/Sm-Rb/Sr年代学、同位素研究、块状岩石岩石化学研究和剪切带运动学分析。这项研究的完成将提供对Alexander-Taku地体边界的详细结构和地层分析，这将是研究海岸深成杂岩的岩石成因和结构的基本依据。

The Alexander-Taku terrane boundary in southeast Alaska represents one of the major tectonic accretionary sutures in the North American Cordillera. Prior work has shown that the boundary consists of a major west-vergent thrust belt which formed in middle Cretaceous time in conjunction with the juxta position of the two terranes and the onset of regional plutonism of the Coast Plutonic Complex. This renewal project will complete a detailed analysis of the structure of the thrust belt and its relations with plutonism, and characterization of the stratigraphic units and depositional relations along the terrane boundary. Laboratory analysis will include Pb/U zircon and Nd/Sm-Rb/Sr geochronology, isotopic studies, bulk rock petrochemical studies and shear zone kinematic analyses. Completion of this research will provide a detailed structural and stratigraphic analysis of the Alexander- Taku terrane boundary, which will be a fundamental basis for considering the petrogenesis and structure of the Coast Plutonic Complex.