Proterozoic Tectonic History of the Southern Trans Hudson Orogen

小行星9628331 有两种相互竞争的方案为元古宙会聚的上级和怀俄明州省和每一个模式有广泛的分歧大会的北美大陆。 基本上，一个模型认为碰撞发生在1.85 Ga左右，随后向南有弧幔源的吸积，而另一个模型则认为弧幔源对怀俄明州幔源有相当大的吸积，这个复合幔源最终在1.66 Ga与上级幔源碰撞。 该项目将在两个构造边界暴露的地方解决这个问题，并构成以序列和时间关系为重点的地质年代学、地球化学和构造调查。 结果预计将约束构造重建方案的元古宙组装北美中部。

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.