Collaborative Research: Is the Ingalls Complex (North Cascades, WA) a Polygenetic Ophiolite? A Multidisciplinary Study

由于后期构造的复杂性和缺乏独特的岩性、化石或层序，米勒增生和俯冲杂岩通常难以重建。蛇绿岩，无论是海底还是弧后起源，提供了异常可靠的数据，可以指导构造和地层对比以及在有争议的历史地区的构造重建。该合作项目将研究北Cascades的Ingalls蛇绿岩复合体，以帮助区分几种区域重要的组合可能性。这项工作包括对英格尔斯复合体的地球化学特征、年龄测定和来源分析，并将结果与沿着美国西部边缘延伸1000公里的其他蛇绿岩进行比较。这些数据将有助于确定英格尔斯杂岩是在其当前位置附近形成的，还是作为Baja-BC的一部分被长距离横向运输的，或者是相对于稳定的北美而言的外来物种。

0003444Harper0087829MillerAccretionary and subduction complexes are commonly difficult to reconstruct due to subsequent structural complexity and lack of distinctive lithologies, fossils or stratigraphic sequences. Ophiolites, either of ocean floor or back-arc origins, provide unusually robust data that can guide structural and stratigraphic correlations and tectonic reconstructions in areas of controversial histories. This collaborative project will examine the Ingalls ophiolite complex of the north Cascades in order to help discriminate between several regionally important assembly possibilities. The work involves geochemical characterization, age dating and provenance analysis of the Ingalls complex and comparison of the results to other ophiolites that extend for 1000 km along the western United States margin. These data will help determine whether the Ingalls complex was formed near its present position, was transported long distances laterally as part of Baja-BC, or is exotic with respect to stable North America.