Late Palaeozoic glacial cycles and subcycles in western Gondwana

Correlation of surface and subsurface data of the Paraná Basin, Brazil

Victoria Valdez Buso*, Carolina Danielski Aquino, Paulo Sérgio Gomes Paim, Paulo Sérgio Gomes Paim, Ana Louisa Mori, Claus Fallgatter, Juan Pablo Milana, Benjamin Kneller

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)
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Abstract

The Paraná Basin, the largest basin in South America, received glacially derived sediments during the Late Palaeozoic Ice Age (LPIA) of the Gondwana supercontinent. Despite the importance of this basin for understanding the continental development of the Gondwana glaciation, and the fact that ca. 95% of this basin is not exposed at the surface, few attempts have been made to connect the exposed glacial strata to the subsurface record. In this paper, exposures of glacial cycles in the Upper Itararé Group in Santa Catarina State, southern Brazil, are analyzed, locally correlated and then linked to the three major glacial cycles previously described from subsurface studies along the basin. Together study areas (Doutor Pedrinho and Vidal Ramos) record five, partially comparable shorter glacial subcycles (relative to the major glacial cycles). These series comprise coarse-grained subaqueous outwash deposits, turbidite sand sheets, marine shales, and diamictites, the latter mostly derived from delta slope failure and ensuing resedimentation. In addition to sedimentological and genetic stratigraphic description and analysis, preliminary age determination based on the palynological content is also presented. Besides, a regional correlation of the described succession to the subsurface record is proposed based on well logs and core information. All the palynomorph associations identified from the exposed successions, which represent the upper third part of the Itararé Group, are related to the Subzone Protohaploxypinus goraiensis, base of the Vittatina costabilis Zone. This zone and correlated ones along the Gondwana are considered Early Permian in age. However, a first isotopic age recently obtained for the upper Itararé Group and published elsewhere is considered within a regional stratigraphic framework once it leads to new insights in terms of the LPIA time span recorded in the Paraná Basin.

Original languageEnglish
Article number108435
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume531
Issue numberPart B
Early online date6 Sep 2017
DOIs
Publication statusPublished - 1 Oct 2019

Fingerprint

Gondwana
Paleozoic
basins
Brazil
basin
ice
Pleistocene
palynomorph
age determination
outwash
supercontinent
slope failure
glaciation
turbidite
Permian
sand
well
sediments
sediment

Keywords

  • Biostratigraphy
  • Itararé Group
  • Palynology
  • Sequence stratigraphy

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Cite this

Late Palaeozoic glacial cycles and subcycles in western Gondwana : Correlation of surface and subsurface data of the Paraná Basin, Brazil. / Valdez Buso, Victoria; Aquino, Carolina Danielski; Paim, Paulo Sérgio Gomes; Gomes Paim, Paulo Sérgio ; Mori, Ana Louisa; Fallgatter, Claus; Milana, Juan Pablo; Kneller, Benjamin.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 531, No. Part B, 108435, 01.10.2019.

Research output: Contribution to journalArticle

Valdez Buso, Victoria ; Aquino, Carolina Danielski ; Paim, Paulo Sérgio Gomes ; Gomes Paim, Paulo Sérgio ; Mori, Ana Louisa ; Fallgatter, Claus ; Milana, Juan Pablo ; Kneller, Benjamin. / Late Palaeozoic glacial cycles and subcycles in western Gondwana : Correlation of surface and subsurface data of the Paraná Basin, Brazil. In: Palaeogeography, Palaeoclimatology, Palaeoecology. 2019 ; Vol. 531, No. Part B.
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abstract = "The Paran{\'a} Basin, the largest basin in South America, received glacially derived sediments during the Late Palaeozoic Ice Age (LPIA) of the Gondwana supercontinent. Despite the importance of this basin for understanding the continental development of the Gondwana glaciation, and the fact that ca. 95{\%} of this basin is not exposed at the surface, few attempts have been made to connect the exposed glacial strata to the subsurface record. In this paper, exposures of glacial cycles in the Upper Itarar{\'e} Group in Santa Catarina State, southern Brazil, are analyzed, locally correlated and then linked to the three major glacial cycles previously described from subsurface studies along the basin. Together study areas (Doutor Pedrinho and Vidal Ramos) record five, partially comparable shorter glacial subcycles (relative to the major glacial cycles). These series comprise coarse-grained subaqueous outwash deposits, turbidite sand sheets, marine shales, and diamictites, the latter mostly derived from delta slope failure and ensuing resedimentation. In addition to sedimentological and genetic stratigraphic description and analysis, preliminary age determination based on the palynological content is also presented. Besides, a regional correlation of the described succession to the subsurface record is proposed based on well logs and core information. All the palynomorph associations identified from the exposed successions, which represent the upper third part of the Itarar{\'e} Group, are related to the Subzone Protohaploxypinus goraiensis, base of the Vittatina costabilis Zone. This zone and correlated ones along the Gondwana are considered Early Permian in age. However, a first isotopic age recently obtained for the upper Itarar{\'e} Group and published elsewhere is considered within a regional stratigraphic framework once it leads to new insights in terms of the LPIA time span recorded in the Paran{\'a} Basin.",
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N1 - This work is part of a research project supported by BG Brazil E&P Ltd. entitled “Carboniferous de-Glacial record in the Paraná Basin and its analogue in the Paganzo Basin of Argentina: Impacts on reservoir predictions”. The authors would also like to acknowledge the ANP (Agência Nacional do Petróleo, Gás Natural e Biocombustível) (ANP BG 29) for its support to the project. This project was carried out at the Universidade do Vale do Rio dos Sinos (UNISINOS) in collaboration with the University of Aberdeen, Universidade Federal do Rio Grande do Sul (UFRGS), Universidad Nacional de San Juan (UNSJ), Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). The third author would like to acknowledge the long-term support from the Brazilian Research Council (Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq). A special acknowledgment is made to Carla Puigdomenech, Bruno Vaz de Carvalho and Fabiano Rodrigues, who assisted in the field campaigns.

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