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

由于随后的构造复杂以及缺乏独特的岩性、化石或地层层序，通常很难重建吸积和俯冲杂岩。蛇绿岩，无论是来自海底还是弧后，提供了异常强大的数据，可以指导有争议历史地区的构造和地层对比和构造重建。这一合作项目将研究北喀斯喀特的英戈尔斯蛇绿岩杂岩，以帮助区分几种具有区域重要性的组装可能性。这项工作包括英格尔杂岩的地球化学特征、年龄测定和来源分析，以及与美国西部边缘绵延1000公里的其他蛇绿岩的比较。这些数据将有助于确定英戈尔斯杂岩是在其当前位置附近形成的，是作为巴哈-公元前部分的一部分被长距离横向运输的，还是相对于稳定的北美来说是异国情调。

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.