Paleoenvironmental analysis of the stromatolites from santa Rosa de Viterbo: geochemistry and paleontology of the singular ocurrences of the Permian microbialites of the Paraná Basin

• Grant number: 19/00515-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2019
• End date: December 31, 2019
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Lucas Verissimo Warren
• Grantee: Gabriel Correa Antunes
• Host Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

Microbialites are sedimentary deposits of the carbonate formed by the action of benthic microbiota and occur as distinct forms depending of the environment parameters as bathymetry, hydrodynamic conditions or even, the type of bacterial community. The study of these sedimentary deposits is fundamental for the understanding of the sedimentary and environmental dynamics of the present and past carbonate systems, especially those evaporitic and ecologically stressful. This project here presented propose the study of the microbial facies and the isotopic and geochemical signatures of the microbialites from the Irati Formation, basal unit of the Passa Dois Group (Permian, Paraná Basin). This innovative approach is fundamental to delineate and reconstruct the environments in which such unit was deposited, especially those related to the stromatolite occurrences of the Sta. Rosa de Viterbo Town - SP. The importance of studying the microbialites of the Fm. Irati is multiple and is justified by the restricted number of works concerned on this problematic, specifically those focused on detailed morphological description and geochemical and isotopic analysis. The study of Phanerozoic microbialites is also important due to its rarity in the geological record and its increasing potential as reservoirs for hydrocarbons. Finally, based on the scenario above, the study of microbialites of Fm. Irati can be considered as a priority tool in the definition of the depositional and paleoenvironmental conditions that acted in the inner seas of the SW portion of the Gondwana Supercontinent during Permian.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ANTUNES, G. C.; WARREN, L. V.; OKUBO, J.; FAIRCHILD, T. R.; VAREJA, F. G.; UHLEIN, G. J.; INGLEZ, L.; POIRE, D. G.; BAHNIUK, A. M.; SIMO, M. G.. The rise and fall of the giant stromatolites of the Lower Permian Irati Formation (Paran?a Basin, Brazil): A multi-proxy based paleoenvironmental reconstruction. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v. 606, p. 23-pg., 2022-10-03. (19/00515-7)