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

0003444哈珀0087829米勒增生和俯冲复合体通常很难重建，由于随后的结构复杂性和缺乏独特的岩性，化石或地层序列。 无论是海底还是弧后起源的蛇绿岩，都提供了异常可靠的数据，可以指导有争议历史地区的构造和地层对比以及构造重建。 这一合作项目将研究北喀斯喀特山脉的英格尔蛇绿岩复合体，以帮助区分几个区域重要的组装可能性。 这项工作涉及英戈尔斯杂岩的地球化学特征、年代测定和物源分析，并将结果与沿美国西部边缘延伸沿着1 000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复合体是在其目前的位置附近形成的，还是作为Baja-BC的一部分被长距离横向运输的，还是相对于稳定的北美而言是外来的。

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.