| Grant number: | 20/13258-0 |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| Start date: | February 01, 2022 |
| End date: | June 30, 2022 |
| Field of knowledge: | Physical Sciences and Mathematics - Oceanography - Geological Oceanography |
| Principal Investigator: | Luigi Jovane |
| Grantee: | Mariana Benites |
| Supervisor: | Francisco Javier González |
| Host Institution: | Instituto Oceanográfico (IO). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
| Institution abroad: | Instituto Geológico y Minero de España (IGME), Spain |
| Associated to the scholarship: | 18/05114-8 - Ferromanganese crusts and phosphorites from the Rio Grande Rise, BP.DR |
Abstract Ferromanganese crust (Fe-Mn) deposits are long known to exist on the Rio Grande Rise (RGR), one of the largest oceanic rises in the South Atlantic Ocean. However, only this year the first detailed geochemical study on RGR Fe-Mn crusts was published by the candidate to this proposal under her PhD project. The geochemistry of Fe-Mn crusts from the summit of the RGR (650-800 m) was controlled by multiple events of phosphatization in the past geological time, resulting in high content of phosphate and depletion of most rare metals of economic interest, i.e. Co, Te, Bi, Mo, Zr and the rare earth elements (REE). However, the set of Fe-Mn crust samples previously studied is from a short water depth range and small area compared to the total RGR area, and thus reflect the oceanographic condition from a limited setting. For instance, phosphatization tends to be controlled by water depth, as it occurs when the seamount is bathed by suboxic and phosphate-rich seawater during episodes of expanded Oxygen Minimum Zone. Likewise, variations of the geographical location within the same oceanic elevation may influence the geochemistry of Fe-Mn crusts due to either different water masses, oxygenation, sedimentation rate, or circulation patterns. This way, the investigation of Fe-Mn crusts from different locations and water depths in the RGR is fundamental to add to the understanding of the controls of RGR crusts formation and geochemistry. This project aims to apply a range of analytical techniques to investigate the petrography, mineral, and chemical composition of Fe-Mn crusts from a wide range of locations and water depth in the RGR, all of which to be developed in collaboration with the Geological Survey of Spain (Instituto Geologico y Minero de España). Ultimately, the research collaboration will bring enormous academic and professional gains to the proponent fellow, generate publishable material of relevance to the field, and exportation of scientific knowledge back to Brazil. (AU) | |
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