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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
Effective date (Start): March 01, 2018
Effective date (End): 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
Research place: 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


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.

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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)
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, . (17/19023-1, 15/07391-0)

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