Analysis of Proterozoic Deformation in Archean Rocks North of the Cheyenne Belt in the Central Laramie Range, SE Wyoming

最近的北美克拉通前寒武纪构造模型表明，太古代怀俄明克拉通东南缘在约1.8Ga的早元古代碰撞事件中持续了强烈的厚皮变形。然而，怀俄明板块沿缝合线宽带的大部分变形和变质作用被归因于太古代变形。本项目将重新考察这一宽带，并尝试将变形变质作用划分为太古宙和早元古代两个阶段。研究结果将有助于更好地了解大陆对元古宙辐合边缘构造响应的构造变质史。它将为这一过程提供有价值的模型，可以深入了解类似但暴露程度较低的地区（如苏必利尔湖南部地区）的演化。

Recent models of the precambrian construction of the north American craton indicate that the southeastern margin of the Archean Wyoming craton sustained intense thick- skinned deformation during an early Proterozoic collision event at about 1.8Ga. However, much of the deformation and metamorphism of the Wyoming plate in a wide zone along the suture has been attributed to Archean deformation. This project will re-examine this broad belt and attempt to separate and partition the deformation and metamorphism into Archean and early Proterozoic events. Results will provide a better understanding of the tectono-metamorphic history of continental response to Proterozoic convergent margin tectonics. It will provide valuable models for this process that can provide insight into the evolution of similar but less well exposed regions such as the southern Lake Superior area.