Element and isotope geochemistry from iron formations, carbonates and black shales: new insights into paleoredox conditions during the Neoarchean, Paleo- and Neoproterozoic in Brazil

• Grant number: 19/16271-0
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: October 01, 2019
• End date: September 30, 2020
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Marly Babinski
• Grantee: Eric Siciliano Rego
• Supervisor: Vincent Busigny
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: Institut de physique du globe de Paris, France
• Associated to the scholarship: 18/05892-0 - Element and isotope geochemistry from iron formations and black shales: new insights into paleoredox conditions during the Paleo- and Neoproterozoic in North and Midwestern Brazil, BP.DR

Abstract

The evolution of the Earth and its inter-relations with life have been a major research topic during the past decades. Questions regarding the planet's habitability, including when the ocean and atmosphere became oxygenated, still imposes challenges to our understanding of how and when these resources evolved. The geological record, particularly iron formations (IF), carbonates and shales from the Archean/Paleoproterozoic to Neoproterozoic, are well-suited archives to further explore such relationships before, during and after the rise of atmospheric oxygen. Iron isotopes have shown to be a valuable tool to reconstruct Precambrian paleoenvironments, even though there are still remaining questions regarding the Fe cycle throughout Earth's history. The aim of this internship is to go abroad to the Institut de Physique du Globe de Paris (IPGP) with the supervision of Dr. Vincent Busigny to apply iron (Fe) isotopes in carbonates, shales and iron formations (IF) to further constrain redox changes in the ocean-atmosphere system spanning the Neoarchean/Paleoproterozoic in Carajás, PA, and the Neoproterozoic in Corumbá, MS. Moreover, these samples from South America will be key to make further correlations with other well-studied sections throughout the globe. The laboratories at IPGP provide state-of-the-art facilities and conditions to learn all the necessary techniques related to isotopic geochemistry, which will later be implemented at the Instituto de Geociências, University of São Paulo (USP), Brazil.

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)

REGO, ERIC SICILIANO; BUSIGNY, VINCENT; LALONDE, STEFAN V.; PHILIPPOT, PASCAL; BOUYON, AMAURY; ROSSIGNOL, CAMILLE; BABINSKI, MARLY; DE CASSIA ZAPPAROLI, ADRIANA. Anoxygenic photosynthesis linked to Neoarchean iron formations in Carajas (Brazil). Geobiology, v. 19, n. 4, p. 326-341, JUL 2021. (18/02645-2, 19/16271-0, 15/16235-2)

REGO, ERIC SICILIANO; BUSIGNY, VINCENT; LALONDE, STEFAN V.; ROSSIGNOL, CAMILLE; BABINSKI, MARLY; PHILIPPOT, PASCAL. Low-phosphorus concentrations and important ferric hydroxide scavenging in Archean seawater. PNAS NEXUS, v. 2, n. 3, p. 7-pg., 2023-03-01. (15/16235-2, 19/16271-0, 19/16066-7, 18/05892-0, 18/02645-2)

REGO, ERIC SICILIANO; BUSIGNY, VINCENT; PHILIPPOT, PASCAL. Chemical extraction of iron from carbonate in banded iron formations for isotope analysis. CHEMICAL GEOLOGY, v. 611, p. 13-pg., 2022-11-20. (18/05892-0, 19/16271-0, 15/16235-2)