Abstract
The aim of this paper is to present the arguments in support of the idea that the Río de la Plata craton as a whole was not involved in a Panafrican orogeny.
On the other hand, based on field relations, petrography, and only a few available geochronological data, we began to find evidences for the identification of a Middle Proterozoic (Grenvillian) event involving sedimentation, metamorphism, and large-scale thrusting. Intense dextral shear with the development of thick mylonitic bands (up to 20 km wide), associated with this episode also suggest oblique collision occurred here.
As we understand the evolution of the Uruguayan crystalline basement, the assembly of the Rio de la Plata craton, and the Panafrican (Brasiliano) terrane was completed during Cambrian and after the deposition of the Arroyo del Soldado Group. The main formations of this unit were considered up to now to belong to the Panafrican molasse.
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Campal, N., Schipilov, A. (1999). The Eastern Edge of the Rio De La Plata Craton: A History of Tangential Collisions. In: Sinha, A.K. (eds) Basement Tectonics 13. Proceedings of the International Conferences on Basement Tectonics, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4800-9_3
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