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式表明，怀俄明州太古宙克拉通东南缘在约1.8Ga的早元古代碰撞事件中经历了强烈的厚皮变形。然而，怀俄明板块沿缝合线宽阔地带的大部分变形和变质作用被归因于太古宙变形。该项目将重新研究这条宽阔的带，并试图将变形和变质作用分离和划分为太古代和早元古代事件。这些结果将有助于更好地理解大陆对元古界会聚边缘构造的响应的构造变质历史。它将为这一过程提供有价值的模型，可以洞察类似但曝光率较低的地区的演变，如南部苏必利尔湖地区。

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.