Bulk sulfur isotopic data and proxy minerals from the Sete Lagoas Formation (Bambuí Group)

• Grant number: 17/19023-1
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: March 01, 2018
• End date: February 28, 2019
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Lucas Verissimo Warren
• Grantee: Juliana Okubo
• Supervisor: Shuhai Xiao
• Host Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil
• Institution abroad: Virginia Polytechnic Institute and State University, United States
• Associated to the scholarship: 15/07391-0 - Sedimentary evolution of the Sete Lagoas formation (Bambuí group, northern Minas Gerais State) in the context of the upper Ediacaran sedimentary basins, BP.DR

Abstract

The particular mineral association containing barite, apatite and aragonite from the base of the Sete Lagoas Formation (SLF), central São Francisco craton (Brazil), provides a valuable information about the chemical evolution of the marine water during the end of the Neoproterozoic. The occurrence of these proxy minerals for marine sulfate in the lower and middle part of the unit encourages to investigate how the stratigraphic variation of sulfur isotope occur in the Neoproterozoic ocean. This internship project aims to present a high resolution bulk sulfur isotopic data for the Sete Lagoas Formation and discuss its relationship with framboidal and cuboidal pyrites (´34Spy -SIMS) from a chert band in the middle part of the unit. The internship will be developed at the Virginia Tech University (USA), supervised by Prof. Dr. Shuhai Xiao. The motivation for this internship is learning different analytical techniques (mainly S isotopes preparation and analysis, and SIMS analysis) applied to Ediacaran carbonate rocks that contribute to determine the paleoenvironmental conditions using a combination of sedimentology and geochemistry approaches.

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)

OKUBO, JULIANA; KAUFMAN, ALAN J.; WARREN, LUCAS, V; EVANS, MICHAEL N.; MARROQUIN, SELVA; VARNI, MICHAEL A.; MISI, AROLDO; BAHNIUK, ANELIZE M.; XIAO, SHUHAI. The sulfur isotopic consequence of seawater sulfate distillation preserved in the Neoproterozoic Sete Lagoas post-glacial carbonate, eastern Brazil. JOURNAL OF THE GEOLOGICAL SOCIETY, v. N/A, p. 23-pg., 2022-02-28. (17/19023-1, 18/26230-6, 15/07391-0)

OKUBO, JULIANA; INGLEZ, LUCAS; UHLEIN, GABRIEL J.; WARREN, LUCAS V.; XIAO, SHUHAI. SIMPLE STRUCTURES AND COMPLEX STORIES: POTENTIAL MICROBIALLY INDUCED SEDIMENTARY STRUCTURES IN THE EDIACARAN SERRA DE SANTA HELENA FORMATION, BAMBU ' I GROUP, EASTERN BRAZIL. PALAIOS, v. 38, n. 4, p. 22-pg., 2023-04-01. (17/19023-1, 15/07391-0, 18/26230-6)

OKUBO, JULIANA; KLYUKIN, YURY IGOREVICH; WARREN, LUCAS VERISSIMO; SUBLETT, JR., D. MATTHEW; BODNAR, ROBERT J.; GILL, BENJAMIN C.; XIAO, SHUHAI. Hydrothermal influence on barite precipitates in the basal Ediacaran Sete Lagoas cap dolostone, Sao Francisco Craton, central Brazil. Precambrian Research, v. 340, MAY 2020. (17/19023-1, 15/07391-0)