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The nitrogen biogeochemical cycle Ediacaran rocks: A study on carbonates from the Bambuí Group, São Francisco Basin

Grant number: 19/24630-0
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): March 01, 2020
Effective date (End): August 31, 2020
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:Marly Babinski
Grantee:Paula Luiza Fraga Ferreira
Supervisor abroad: Magali Ader
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Institut de physique du globe de Paris, France  
Associated to the scholarship:19/13228-6 - The nitrogen biogeochemical cycle on Ediacaran rocks: a study on carbonates from the Bambuí Group, São Francisco Basin, BP.MS

Abstract

Nitrogen is an element that conditions life on Earth, and the understanding of how its biogeochemical cycle evolved through geological time provides valuable information about variations of the ocean chemistry, since the speciation of this element is strongly controlled by the redox conditions of the depositional environment. This project aims to obtain N isotopic data (15N) of carbonates of Ediacaran age, when the biota diversification took place and preceded the Cambrian life explosion. The carbonate successions that will be studied are from the Bambuí Group deposited in the São Francisco basin, in Minas Gerais, Brazil. The carbonates of this basin show anomalously high 13C values interpreted as a result of intense archea methanogenic activity in anoxic environments and methane escape to the atmosphere. The 15N results will allow to get more information on the water chemistry and on gas exchanges with the atmosphere in the Ediacaran time. Since few fossil occurrences are reported in the Bambuí Group, the results will also help to better understand the ecosystem dynamics at the Ediacaran - Cambrian transition. This work will focus on N isotopic data acquisition and interpretation, and will benefit strongly from the availability of other isotopic data (C, S, Sr) previously obtained on the Bambuí Group, which will allow developing an integrated understanding of the biogeochemistry in this environment. (AU)

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