Paleomagnetic and 40Ar/39Ar Investigations into the Origin of Late Proterozoic Mobile Belts in South America and Africa

许多前寒武纪的地盾或克拉通都被克拉通形成后变形和变质的“活动带”所侵袭。这些带与前板块边缘板块碰撞的原点基本一致，但与碰撞相关的样式和相对位移没有得到很好的约束。这次更新将继续从巴西活动带两侧的岩石单位进行古地磁和Ar/Ar年龄测定计划。结合巴西带在西非的延伸，即法鲁西亚带的现有数据，结果将能够评估与可能的晚元古代大陆碰撞有关的位移和时间。

Many of the precambrian shields or cratons are transgressed by "mobile belts" that have been the loci of deformation and metamorphism subsequent to craton formation. These belts are generally consistent with an origin by plate collision at former plate margins, however, the style and relative displacements associated with these collisions are not well constrained. This renewal will continue a paleomagnetic and Ar/Ar age dating program from rock units on opposite sides of the Brasilian mobile belt. Results, combined with existing data from the extension of the Brazilian belt in west Africa, the Pharusian belt, will allow assessment of the displacement and timing associated with a possible late Proterozoic continental collision.