Origin and Evolution of the Great Falls Tectonic Zone: Implications for the Assembly of Southern Laurentia and Rodinian Connections

大瀑布构造带是一个北东向的特征，从爱达荷州东北部延伸到蒙大拿州和萨斯喀彻温省的边界，可能代表了太古宙怀俄明省和加拿大盾的赫恩省之间的碰撞缝合。然而，最近的工作提出了另一种解释，即大瀑布构造带是被跨哈德逊造山重新激活的陆内剪切带，另一个特征代表怀俄明-赫恩缝合。该项目将研究新记录的大瀑布构造带1.86Ga变质火成岩，解决与南部劳伦蒂亚的组装和罗迪尼亚的解体有关的几个基本问题。预计结果将有助于澄清大瀑布构造带对太平洋西北地区发展的意义。

0106592MuellerThe Great Falls tectonic zone is a NE-trending feature that extends from northeastern Idaho to the Montana - Saskatchewan border, and may represent the collisional suture between the Archean Wyoming province and the Hearne province of the Canadian shield. However, recent work has raised the alternative interpretation that the Great Falls tectonic zone is an intracontinental shear zone reactivated by the Trans-Hudson orogeny and another feature represents the Wyoming-Hearne suture. This project will examine newly documented 1.86 Ga meta-igneous rocks of the Great Falls tectonic zone that will address several fundamental issues associated with the assembly of southern Laurentia and the breakup of Rodinia. Results are expected to help clarify the interpretation of the significance of the Great Falls tectonic zone in relation to the development of the Pacific Northwest.