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Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation

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Autor(es):
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Warren, L. V. [1] ; Freitas, B. T. [2] ; Riccomini, C. [3] ; Boggiani, P. C. [4] ; Quaglio, F. [5] ; Simoes, M. G. [6] ; Fairchild, T. R. [4] ; Giorgioni, M. [7] ; Gaucher, C. [8] ; Poire, D. G. [9] ; Caceres, A. A. [4] ; Sial, A. N. [10]
Número total de Autores: 12
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Ave 24A, 1515, BR-13506900 Rio Claro - Brazil
[2] Univ Estadual Campinas UNICAMP, Fac Tecnol, Rua Paschoal Marmo 1888, BR-13484332 Jd Nova Itdlia, Limeira - Brazil
[3] Univ Sao Paulo, Inst Energia & Ambiente, Ave Prof Luciano Gualberto 1289, BR-05508010 Sao Paulo - Brazil
[4] Univ Sao Paulo, Inst Geociencias, Rua Lago 562, BR-05508010 Sao Paulo - Brazil
[5] Univ Fed Sao Paulo, Dept Ecol & Biol Evolut, Rua Prof Artur Riedel 275, BR-09972270 Diadema - Brazil
[6] Univ Estadual Paulista, Inst Biociencias, Dept Zool, BR-18618000 Botucatu, SP - Brazil
[7] Univ Brasilia, Inst Geociencias, ICC Ala Cent, BR-70910900 Brasilia, DF - Brazil
[8] Fac Ciencias, Dept Geol, Calle Igua 4225, Montevideo 11400 - Uruguay
[9] UNLP, CONICET, Ctr Invest Geol, Calle 1, 644, RA-1900 La Plata, Buenos Aires - Argentina
[10] Univ Fed Pernambuco, NEG LABISE, Ave Acad Helio Ramos, BR-50670000 Recife, PE - Brazil
Número total de Afiliações: 10
Tipo de documento: Artigo Científico
Fonte: Precambrian Research; v. 322, p. 99-121, MAR 2019.
Citações Web of Science: 5
Resumo

The Itapucumi Group is recognized worldwide due to its well-preserved Ediacaran fossil assemblage. Despite its paleontological importance, this unit remains as the least studied South American Neoproterozoic sedimentary succession. Recorded at northern Paraguay, the Itapucumi Group is a similar to 400 m-thick siliciclastic and carbonate succession deposited on the Paleoproterozoic basement of the Rio Apa Craton. At west, this unit is deformed and metamorphosed, whereas the eastern domain constitutes an undeformed cratonic cover. The Itapucumi Group comprises, from base to top, siliciclastic rocks of the Vallemi Formation, succeeded by limestones and dolomites of the Camba Jhopo and Tagatiya Guazu formations, which are capped by marls and mudstones of the Cerro Curuzu Formation. The entire sedimentary succession consists of three depositional sequences deposited in a large rimmed carbonate platform open to the ocean westward: S.1, the lowermost predominantly terrigenous, and sequences S.2 and S.3, comprising carbonate and terrigenous facies associations. Carbon isotope data from limestones and dolostones show values of + 1.93 parts per thousand delta C-13 VPDB and Sr-87/Sr-86 ratios of 0.7084 and 0.7089, in agreement with a depositional age between 600 Ma and 550 Ma and coherent with the Cloudina biozone. These data support the paleogeographic correlation between the Itapucumi and Corumba groups at the margins of the Amazonian and Rio Apa Craton. The siliciclastic basal successions of both units, are interpreted as deposited in rift basins developed during the fragmentation of the Rodinia supercontinent (Cryogenian to Ediacaran). Later thermal subsidence led to the generation of a new accommodation space around 550 and 528 Ma, recording extensive carbonate platforms along the margins of Pampia, Amazonian and Rio Apa cratons. The deformation of the Itapucumi and Corumba basins started at around 528 Ma, and was controlled by the reactivation of listric and normal faults generated during the rift stage. The opposite tectonic vergence observed in the Vallemi and Paraguay fold-and-thrust belts can be ascribed to oppose master fault polarities in the precursor basins of this context, as well as to the rigid behavior of the Rio Apa Craton. The compressional phase ended around 484 Ma, and corresponding to the last stresses related to the Brasiliano Cycle and the closure of SW Gondwana. (AU)

Processo FAPESP: 10/02677-0 - Isótopos estáveis (C, O e Sr) do Grupo Itapucumi e correlações com o Grupo Corumbá (Ediacarano)
Beneficiário:Paulo César Boggiani
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/19584-4 - Tectônica e sedimentação do grupo Itapucumi no contexto das plataformas carbonáticas ediacaranas: abordagem geoquímica, geocronológica, paleomagnética e bioestratigráfica
Beneficiário:Lucas Verissimo Warren
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 15/24608-3 - Análise multi-proxy da formação Cerro Negro, Argentina: bioestratigrafia e paleoambiente do primeiro fossillagerstätte Ediacarano da América do Sul
Beneficiário:Lucas Verissimo Warren
Linha de fomento: Auxílio à Pesquisa - Regular