Archean to early Neoproterozoic crustal growth of the southern South American Platform and its wide-reaching "African" origins

Autor(es)

Hueck, Mathias ; Oriolo, Sebastian ; Oyhantcabal, Pedro ; Heller, Beatrix M. M. ; Wemmer, Klaus ; Siegesmund, Siegfried ; Basei, Miguel A. S.

• Tipo de documento: Artigo Científico
• Fonte: Precambrian Research; v. 369, p. 24-pg., 2022-01-08.

Resumo

The amalgamation of southwestern Gondwana during the late Neoproterozoic Brasiliano/Pan-African orogenic cycle involved the tectonic interaction of the Congo, Kalahari and Rio de la Plata cratons, together with numerous smaller basement fragments scattered throughout South America. A comprehensive review of U-Pb and Lu-Hf spot analyses in zircon provides new insights on the pre-Brasiliano crustal growth of the main tectonic domains of the southern South American Platform from the Archean to the early Neoproterozoic. The results highlight similarities between five basement fragments, from south to north: the Nico Perez Terrane, Tijucas Terrane, Camboriu Complex, Luis Alves Terrane and Curitiba Terrane. Whereas these units have variable characteristics, especially concerning differing degrees of tectonic reworking in the late Neoproterozoic, they share similarities in their geological evolution. They were all originally accreted in the Archean, as evidenced by Hf TDM model ages and zircon inheritance, and later experienced intense orogenic reworking during the Rhyacian and Orosirian. The Paleoproterozoic record is diverse and indicates a complex episodic evolution instead of a single orogenic event. Conspicuous diachronic magmatic events took place locally in the Late Paleoproterozoic and Mesoproterozoic, interrupting an otherwise relatively stable tectonic setting until the Neoproterozoic. The Archean origin and strong crustal signatures of the main Paleoproterozoic units distinguish these terranes from the Rio de la Plata Craton, evidencing instead stronger affinities with African crustal blocks such as the Congo and Kalahari cratons. This relationship has implications for the geodynamic reconstruction of southwest Gondwana that extend into the early Neoproterozoic, as it contextualizes the genetic link between the main Tonian events in the region, namely the formation of the Sao Gabriel Terrane and the emplacement of the magmatic protoliths of the basement of the Punta del Este Terrane. They can be understood as marginal and within-plate manifestations of an accretionary orogen, respectively. The basement of the Punta del Este Terrane has signatures compatible with the recycling of ancient crust through the mixture of mantellic magmatic input with the partial melting of Archean or Archean-derived Proterozoic lithosphere, a process that likely took place multiple times from the Paleoproterozoic onwards in the region. (AU)

• Processo FAPESP: 15/03737-0 - O Cráton Rio de la Plata e o Gondwana Ocidental
• Beneficiário: Miguel Angelo Stipp Basei
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/06838-2 - Zonas de cisalhamento Brasilianas/Pan-Africanas no Cinturão Kaoko e conexões com a América do Sul: evolução Neoproterozoica e reativações fanerozoicas
• Beneficiário: Mathias Hueck
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado