Tectonics of the Aracuai/Ribeira Orogenic Tongue of Southeastern Brazil, and its Significance for the Paleo- and Neoproterozoic Assembly of West Gondwana

[9902730]板块构造理论与围绕地球表面的大陆地壳的重大历史重排是相容的，包括偶尔的次大陆组合，其中包括大部分大陆地壳在一个大大陆块中。最近关于新元古代全球板块组合的证据使人们普遍接受了陆地块的重大重组，但是组合的几何形状、时间和机制存在争议。该项目旨在提供位于巴西西南部西冈瓦纳超大陆中心区域的地壳配方和组合数据。这一构造和年龄定年研究的结果有望解决有关新元古代构造的几个关键问题，这将对理解地壳群和超大陆组合具有相当大的实用价值。

9902730MarshakPlate tectonics theory is compatible with major historic rearrangements of the continental crust around the surface of the earth, including occasional subcontinental assembly that includes most of the continental crust in one large landmass. Recent evidence for a neoproterozoic global plate assembly has led to general acceptance of a major reorganization of land masses, but the geometry, timing, and mechanism of assembly are controversial. This project is designed to provide crustal formulation and assembly data from an area at the heart of the West Gondwana supercontinent, now located in southwestern Brazil. Results of this structural and age-dating study are expected to resolve several key issues concerning neoproterozoic tectonism that will be of considerable utility in understanding crustal groups and supercontinental assembly.