U-Pb Zircon Geochronology of Detrital and Ash Fall Deposits of the Southern Paraná Basin: A Contribution for Provenance, Tectonic Evolution, and the Paleogeography of the SW Gondwana
Ruy Paulo Philipp,
Ubiratan Ferrucio Faccini,
Cesar Leandro Schultz,
Gustavo Zvirtes,
Matheus Philippe Bruckmann,
Ernesto Lavina,
Joice Cagliari,
Andrea Ritter Jelinek,
Renata Guimarães Netto,
Adriano Roessler Viana,
Miguel Angelo Stipp Basei
Affiliations
Ruy Paulo Philipp
Centro de Estudos em Petrologia e Geoquímica (CPGq), Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90010-150, RS, Brazil
Ubiratan Ferrucio Faccini
Programa de Pós-Graduação em Geologia, Departamento de Geologia, Universidade do Vale do Rio dos Sinos (UNISINOS), São Leopoldo 93022-750, RS, Brazil
Cesar Leandro Schultz
Centro de Estudos em Petrologia e Geoquímica (CPGq), Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90010-150, RS, Brazil
Gustavo Zvirtes
Department of Geology and Geophysics, University of Aberdeen (UoA), Aberdeen AB24 3FX, UK
Matheus Philippe Bruckmann
Centro de Estudos em Petrologia e Geoquímica (CPGq), Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90010-150, RS, Brazil
Ernesto Lavina
Programa de Pós-Graduação em Geologia, Departamento de Geologia, Universidade do Vale do Rio dos Sinos (UNISINOS), São Leopoldo 93022-750, RS, Brazil
Joice Cagliari
Programa de Pós-Graduação em Geologia, Departamento de Geologia, Universidade do Vale do Rio dos Sinos (UNISINOS), São Leopoldo 93022-750, RS, Brazil
Andrea Ritter Jelinek
Centro de Estudos em Petrologia e Geoquímica (CPGq), Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90010-150, RS, Brazil
Renata Guimarães Netto
Programa de Pós-Graduação em Geologia, Departamento de Geologia, Universidade do Vale do Rio dos Sinos (UNISINOS), São Leopoldo 93022-750, RS, Brazil
Adriano Roessler Viana
PETROBRAS S.A., Rio de Janeiro 20031-912, RJ, Brazil
Miguel Angelo Stipp Basei
Centro de Pesquisas Geocronológicas (CPGEO), Instituto de Geociências, USP, São Paulo 13083-896, SP, Brazil
Zircon U-Pb geochronology was applied to investigate the provenance, depositional ages, and paleogeography of the southwestern Gondwana in detrital and ash fall sediments from Carboniferous to Jurassic succession of the southern Paraná Basin. Four detrital age populations suggest provenance from local and distal sources located to the south, southeast, and southwest: (i) Archean to Paleoproterozoic zircons from the Rio de La Plata Craton, Nico Peres and Taquarembó terranes; (ii) Grenvillian zircons from the basement of the Gondwanides and Namaqua–Natal belts; (iii) Neoproterozoic grains from the Don Feliciano Belt; and (iv) Phanerozoic populations from Paleozoic orogenic belts and related foreland systems in Argentina, as well as eroded units of the Paraná Basin. The paleogeographic reconstruction indicates an evolution in three distinct stages: (1) a gulf open to the Panthalassa Ocean during the Carboniferous; (2) an epicontinental sea with the rise of the Gondwanides Orogeny during the Permian; and (3) continental deposits controlled by an intra-plate graben system during the Triassic. Permian–Triassic volcanogenic zircons provide constrained maximum depositional ages and attested persistent volcanism, related to the Choiyoi magmatism and effects of the climate change episodes. During the Triassic, the extensional graben system recorded the uplift of the basement through regional northwest and northeast fault systems, and the recycling of Permian zircons, modifying source-to-sink relationships.
