Proterozoic Tectonic History of the Southern Trans Hudson Orogen

关于苏必利尔省和怀俄明省的元古代融合有两种相互竞争的情景，每种模式对北美大陆的整合都有广泛的影响。基本上，一个模型在1.85Ga左右发生碰撞，随后向南增加弧形地体，而另一个模型在1.66 Ga时对怀俄明地体进行了相当大的弧形地体吸积，该复合地体最终与Superior地体碰撞。本项目将在两个构造边界暴露的地方解决这一问题，并构成以序列和时间关系为重点的年代学、地球化学和构造调查。结果有望约束北美中部元古代组合的构造重建情景。

9628331 Chamberlain There are two competing scenarios for the Proterozoic convergence of the Superior and Wyoming Provinces and each model has broad ramifications for the assembly of the North American Continent. Basically, one model has the collision at about 1.85Ga with subsequent accretion of arc terranes to the south, while the other model calls for considerable arc terrane accretion to the Wyoming terrane, and this composite terrane finally collided with the Superior terrane at 1.66 Ga. This project will attack this problem in two places where the structural boundary is exposed, and constitutes a geochronological, geochemical and structural investigation focused on the sequence and timing relationships. Results are expected to constrain tectonic reconstruction scenarios for the Proterozoic assembly of central North America.