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Time constraints, redox conditions and sediment sources attending the Proterozoic rise of atmospheric oxygen in Brazil

Grant number: 18/14617-3
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): November 01, 2018
Effective date (End): July 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:Pascal Andre Marie Philippot
Grantee:Francesco Narduzzi
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:15/16235-2 - The co-evolution of life and oxygen on early Earth: a South American perspective, AP.SPEC
Associated scholarship(s):19/17732-0 - Role of subaerial Large Igneous Provinces in modulating environmental and climatic changes during the Proterozoic rise of atmospheric oxygen in Brazil, BE.EP.PD

Abstract

The atmosphere and oceans became oxidized across two main transitional periods, the Great Oxidation Event (~2.45 and 2.2 Ga) and the Neoproterozoic Oxidation Event (~0.80 and 0.54 Ga). Pieces of evidence are found in South Africa, North America, Western Australia and Russia, but the real timing, duration, mechanism and range of O2 increase are still unsolved question due to poor age constraints and contradictory stratigraphic correlations between these different terrains. Intriguingly, several studies have emphasized a possible causal relationship between oxidation events, coeval global glaciation events and widespread activity of subaerial large igneous provinces.In Brazil, sedimentary rocks of the Paleoproterozoic Carajás and Quadrilatero Ferrifero Mineral Provinces, and the Neoproterozoic Jacadigo and Bambuí Groups were deposited during the Great and Neoproterozoic Events, respectively. Nevertheless, they are not considered in global reconstruction because of a still scanty geochronological, elemental and isotopic investigation. This imposes a deepened characterization. The aim of this project is, therefore: i) to constrain the timing of the Great and Neoproterozoic Oxidation Events, and associated glacial episodes through Re-Os geochronology of black shales and sedimentary sulphides of key sedimentary units from Brazil; ii) to perform Nd - Hf isotope systematics on the same organic-rich sediments, glacial diamictites and related carbonates from Brazil and their equivalent from Western Australia (Turee Creek Group) in order to characterize sediment sources and evaluate the potential role of Large Igneous Province in the oxygenation and global cooling of the Erath surface during the Proterozoic.

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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)
NARDUZZI, FRANCESCO; BOSCH, DELPHINE; PHILIPPOT, PASCAL. Evolution of seawater continentally-sourced Nd isotopic composition prior to and during the Great Oxidation Event. Precambrian Research, v. 362, AUG 15 2021. Web of Science Citations: 0.
SCHANNOR, MATHIAS; LANA, CRISTIANO; MAZOZ, ARIELA; NARDUZZI, FRANCESCO; CUTTS, KATHRYN; FONSECA, MARCO. Paleoproterozoic sources for Cordilleran-type Neoproterozoic granitoids from the Aracuai orogen (SE Brazil): Constraints from Hf isotope zircon composition. LITHOS, v. 378, DEC 15 2020. Web of Science Citations: 0.
ROSSIGNOL, CAMILLE; REGO, ERIC SICILIANO; NARDUZZI, FRANCESCO; TEIXEIRA, LIVIA; AVILA, JANAINA N.; SILVA, MARCO A. L.; LANA, CRISTIANO; PHILIPPOT, PASCAL. Stratigraphy and geochronological constraints of the Serra Sul Formation (Carajas Basin, Amazonian Craton, Brazil). Precambrian Research, v. 351, DEC 2020. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.