Abstract
Several lines of evidence suggest that the Río de la Plata Craton (RPC) was part of Rodinia. A proto-Andean Grenvillian belt marks the western edge of the craton. The RPC rifted off Rodinia between 635 and 580 Ma. Evidences of rifting include mafic dyke swarms, anorogenic granites, within-plate basalts and rift sedimentary deposits. Following rifting, an extensive passive margin was established on the eastern margin of the RPC, including the Sierras Bayas, Arroyo del Soldado and Corumbá groups. Shelf inversion due to tangential collision of the Cuchilla Dionisio-Pelotas Terrane (Arachania) with the RPC likely took place around 530 Ma (Búzios Orogeny). Anorogenic, syenitic magmatism dated at 520 Ma in the eastern RPC, is coeval to the Pampean Orogeny (530–515 Ma) in the western RPC, which led to deformation and high-grade metamorphism of the latest Ediacaran-Lower Cambrian Puncoviscana Formation and equivalents. Eastward subduction likely migrated westwards and continued until the Middle Ordovician.
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