Early and Middle Proterozoic Crustal History, Borborema Province, Northeast Brazil

巴西北部的Borborema构造省是在西非、亚马逊和旧金山-刚果克拉通汇聚600 Ma时形成的，形成了古老的冈瓦瓦兰超大陆。由于600 Ma的强烈构造叠加，在博尔伯雷马省内很难识别冈瓦那之前的构造界线。这项研究将提供关键岩性套和岩浆事件的U/Pb年龄测定，并将与巴西同事正在进行的地质填图一起，划定构造边界。这一结果将大大提高对600 Ma前冈瓦大陆构造历史和组合的了解，并将有助于提出前寒武纪大陆增长的关键概念。

The Borborema tectonic province in northern Brazil formed during the 600 Ma convergence of the West African, Amazonian and San Francisco-Congo cratons to form the ancient supercontinent of Gondwanaland. Because of the strong tectonic overprint at 600 Ma it has been difficult to identify pre-Gondwana tectonic boundaries within Borborema province. This study will provide U/Pb age determinations for key lithologic suites and magmatic events and, together with ongoing geologic mapping by Brazilian colleagues, will allow the tectonic boundaries to be delineated. The results will provide much improved understanding of the pre-600 Ma tectonic history and assembly of Gondwanaland, and will contribute to key concepts of continental growth during the Precambrian.//