Quantifiying deformation and erosion at the Yakutat plate corner (SE Alaska) with integrated thermochronology and numerical modelling

我们建议在阿拉斯加东南部(圣埃利亚斯造山带)雅库塔特-北美俯冲带的活动板块角落进行野外研究、热年代学、沉积学和数值模拟的综合。我们将使用热运动学和侵蚀模型从碎屑岩和基岩地质/热年代学样品重建温度-时间路径，该模型量化了该地区可能的变形和侵蚀历史的范围。这些数据和模型将被用来检验这一有争议的假设，即板块拐角会产生快速而集中的变形和折返。这项研究的结果将适用于通过记录板块拐角的地球动力学过程来了解世界其他地方的造山过程。在这份延续提案中，我们介绍了我们在该项目中取得的成就和结果，该项目记录了快速挖掘岩石的空间范围。在第二部分中，我们提出了项目最后阶段的工作时间表和目标。

We propose an integration of field studies, thermochronology, sedimentology, and numerical modeling at the active plate corner of the Yakutat - North American subduction zone in SE Alaska (St. Elias orogen). We will reconstruct temperature - time paths from detrital and bedrock geo-/thermochronology samples using thermo-kinematic and erosion models that quantify the range of possible deformation and erosion histories in this region. The data and models will be used to test the controversial hypothesis that plate corners produce rapid and focused deformation and exhumation. Results from this study will be applicable to understanding orogenic processes elsewhere in the world by documenting geodynamic processes at plate corners. In this continuation proposal we present our accomplishments and results of this project that document the spatial extent of rapidly exhuming rocks. In the second part we present our work schedule and goals for the final stage of this project.