Stratigraphy and geochronological constraints of the Serra Sul Formation (Carajas Basin, Amazonian Craton, Brazil)

Author(s)

Rossignol, Camille ^{[1, 2]} ; Rego, Eric Siciliano ^{[2, 3]} ; Narduzzi, Francesco ^{[1, 4]} ; Teixeira, Livia ^[1] ; Avila, Janaina N. ^[5] ; Silva, Marco A. L. ^[6] ; Lana, Cristiano ^[6] ; Philippot, Pascal ^{[1, 2, 4]}

Affiliation

^[1] Univ Sao Paulo, IAG USP, Inst Astron Geofis & Ciencias Atmosfer, Dept Geofis, Rua Mateo 1226, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil

^[2] Univ Paris, Inst Phys Globe Paris, CNRS, Paris - France

^[3] Univ Sao Paulo, Inst Geociencias, Rua Lago 562, Cidade Univ, BR-05508080 Sao Paulo - Brazil

^[4] Univ Montpellier, Univ Antilles, CNRS, Geosci Montpellier, Montpellier - France

^[5] Australian Natl Univ, Res Sch Earth Sci, 142 Mills Rd, Canberra, ACT 2601 - Australia

^[6] Univ Fed Ouro Preto, Escola Minas, Dept Geol, Appl Isotope Res Grp, Rua Diogo Vasconcelos 122, BR-35400000 Ouro Preto, MG - Brazil

• Document type: Journal article
• Source: Precambrian Research; v. 351, DEC 2020.
• Web of Science Citations: 0

Abstract

The Carajas Basin, Amazonian Craton, hosts extensive Neoarchean to Paleoproterozoic sedimentary archives, which are still poorly constrained regarding their depositional settings, ages, and type of basin in which they have been deposited. In this study, we performed detailed sedimentological investigations and U-Pb dating of detrital zircon in four drill cores intercepting the recently defined Serra Sul Formation. Our data show that this formation corresponds to various shallow to deep subaqueous environments. Shallow water environments are characterized by local occurrences of microbially-mediated structures, while deep water environments are characterized by polymictic conglomerates resulting from the mixing of materials of different origins during downslope debris flow. Both sedimentary facies and common occurrence of syn-sedimentary deformations attest for recurrent slope instabilities. Geochronological investigations allow to define a maximum depositional age of 2684 +/- 10 Ma, that is several tens million years younger than other Neoarchean sedimentary units of the Carajas Basin. Major peaks in age distribution indicate that the Serra Sul Formation derives from local sources that constitute the basement of the Carajas Basin. The infilling of the Carajas Basin by local sources, together with sedimentary facies and depositional environments attesting for slope instabilities, suggest that the Serra Sul Formation was deposited during an active extensional tectonic phase. Such Neoarchean to early Paleoproterozoic tectonic setting compares with those documented in many other cratons worldwide and suggests that it could correspond to the break-up of one of the first documented supercontinent. (AU)

• FAPESP's process: 19/16066-7 - Multiple isotope (O, S, Sr) constraints on the early Paleoproterozoic Great Oxidation Event from barite-bearing deposits of the Minas Supergroup, Minas Basin, Brazil
• Grantee: Camille Yann Rossignol
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 19/17732-0 - Role of subaerial Large Igneous Provinces in modulating environmental and climatic changes during the Proterozoic rise of atmospheric oxygen in Brazil
• Grantee: Francesco Narduzzi
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 18/14617-3 - Time constraints, redox conditions and sediment sources attending the Proterozoic rise of atmospheric oxygen in Brazil
• Grantee: Francesco Narduzzi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/12132-5 - High-resolution environmental record of banded iron formations through rock magnetic, crystallographic and geochemical properties
• Grantee: Livia Paula Vaz Teixeira
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 18/02645-2 - Chronostratigraphy and isotopic tracing of the Paleoproterozoic Minas Supergroup
• Grantee: Camille Yann Rossignol
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/16235-2 - The co-evolution of life and oxygen on early Earth: a South American perspective
• Grantee: Pascal Andre Marie Philippot
• Support Opportunities: Research Projects - SPEC Program
• FAPESP's process: 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
• Grantee: Eric Siciliano Rego
• Support Opportunities: Scholarships in Brazil - Doctorate