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

9902730马克沙克板块构造理论与大陆地壳在地球表面周围的重大历史性重新安排是兼容的，包括偶尔的次大陆组装，将大部分大陆地壳包括在一个大陆块中。新元古代全球板块组装的最新证据使人们普遍接受陆块的重大重组，但组装的几何、时间和机制存在争议。该项目旨在提供西冈瓦那超大陆中心地区的地壳形成和组装数据，该地区目前位于巴西西南部。这项构造和年龄测定研究的结果有望解决与新元古代构造作用有关的几个关键问题，这些问题将对了解地壳群和超级大陆组装有相当大的帮助。

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.