Proterozoic Tectonic History of the Southern Trans Hudson Orogen

9628331张伯伦对于上等省和怀俄明省的元古界汇聚有两种相互竞争的情景，每一种模式都对北美大陆的组装产生了广泛的影响。基本上，一种模式在1.85Ga左右发生碰撞，随后弧形地体向南增长，而另一种模式要求怀俄明地体有相当大的弧形地体吸积，这种复合地体最终在1.66Ga与上位地体发生碰撞。该项目将在两个暴露构造边界的地方解决这一问题，并构成一项专注于层序和时间关系的地质年代学、地球化学和构造调查。预计结果将限制北美中部元古界组装的构造重建情景。

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.