Thermal and depositional history of Early-Permian Rio Bonito Formation of southern Paraná Basin – Brazil
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2020
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International Journal of Coal Geology
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The Paraná Basin is a large volcano-sedimentary basin with a complex depositional history from Ordovician to
the Cretaceous period. During Permian significant amounts of organic-rich beds accumulated within the Rio
Bonito and Irati formations representing deposition in coastal (deltaic and barrier lagoon) and shallow marine
environments, respectively. In this work, the thermal history of these beds is examined from 16 vitrinite reflectance
analyses of coal beds (Rio Bonito Formation), integrated with previous data on coal rank, and 21
apatite fission-track (AFT) analyses, collected from 17 well profiles in the south of the Paraná Basin. Coal
samples showed three different maturity levels. Two with reflectances of 0.4–0.6 and 0.6–0.8%Rr formed by the
natural burial history of the basin (the latter is restricted to the Torres Syncline area). In contrast, the third group
reached much higher values (1.0–5.0%Rr) related to intrusive igneous rocks. The AFT data show thermal
consistency with the reflectance values. The sandstone samples related to the two lower reflectance patterns
were partially reset, preserving AFT ages older than the stratigraphic age of the bed. Otherwise, the samples
severely affected by the magmatism have Cretaceous and Early Cenozoic ages, but some were much younger
than the last magmatic event, implying deep burial before cooling onset. The mean track length distribution of
the partially reset samples is short due to the inheritance of tracks preserved from basement cooling history.
However, the population of fully reset samples gives crucial information on the maximum temperature reached
and the age when cooling started. At these conditions, around 1.0 to 3.0 km of the Paraná Basin sequences would
have been removed from the surface of the studied areas by erosion since Cretaceous. Regional variations in the
amounts of removed sections were controlled by the structural framework, mostly regional NW-SE and NE-SW
oriented structures.
Como referenciar
BICCA, MARCOS M.; KALKREUTH, WOLFGANG; SILVA, TAIS F. da; OLIVEIRA, CHRISTIE H.E. de; GENEZINI, FREDERICO A. Thermal and depositional history of Early-Permian Rio Bonito Formation of southern Paraná Basin – Brazil. International Journal of Coal Geology, v. 228, p. 1-22, 2020. DOI: 10.1016/j.coal.2020.103554. Disponível em: http://repositorio.ipen.br/handle/123456789/31458. Acesso em: 23 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.