COLLABORATIVE RESEARCH: Tectonic Consequences of Ridge Subduction and Plate Reorganization; the Chugach MetamorphicComplex, Alaska

9304062西森大多数构造过程最终是由板块运动驱动的，然而，除了最简单的情况外，两者之间的联系通常是模糊的。阿拉斯加丘加赫变质杂岩的最新研究表明，该杂岩的历史不仅与海脊俯冲密切相关，而且与北太平洋板块重组密切相关，北太平洋板块重组改变了俯冲海脊附近的板块构造。这一假说将在该项目中通过三维结构分析、地质年代学和地球化学技术进行验证。这些结果对早新生代北太平洋板块的重建具有重要意义，最终以库拉板块的消亡而告终。此外，它还提供了机会来研究伴随着脊-沟-脊三重结相互作用的深层次过程，其中涉及三重结的一个分支上的高度倾斜的分量。

9304062 Sisson Most tectonic processes are ultimately driven by plate motions, however the tie between the two is generally obscure except in the simplest cases. Recent work in the Chugach Metamorphic Complex of Alaska suggests that the history of the complex is intimately tied not only to ridge subduction but to a North Pacific plate reorganization that changed the plate configuration in the vicinity of the subducting ridge. This hypothsis will be tested in this project by three dimensional structural analysis, geochronology and geochemical techniques. Results have important implications for early Cenozoic North Pacific plate reconstructions that ultimately ended with demise of the Kula plate. In addition it offers the opportunity to examine deep seated processes that accompany ridge-trench- ridge triple junction interactions that involves a highly oblique component on one limb of the triple junction.