Grant number: | 13/25659-5 |
Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
Start date until: | March 01, 2014 |
End date until: | September 30, 2014 |
Field of knowledge: | Physical Sciences and Mathematics - Geosciences - Geology |
Principal Investigator: | Lena Virginia Soares Monteiro |
Grantee: | Carolina Penteado Natividade Moreto |
Host Institution: | Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
Abstract The Carajás Province hosts the largest quantity of world-class iron oxide-copper-gold (IOCG) deposits currently known. Although these deposits are important targets of mineral exploration, there is not a single genetic model able to explain all the peculiarities of each deposit, and reflect the unique evolution of this metallogenetic province. Additionally, detailed studies tracing the possible sources of the metals and hydrothermal fluids related to the genesis of the IOCG deposits are scarce. Previous isotope studies, including geochronology, do not support a cogenetic evolution for the different deposits. Instead, they allowed to delimit distinct metallogenic events associated with the genesis of the IOCG deposits from Carajás, either in the Archean (ca. 2.70 Ga and 2.57 Ga) or the Paleoproterozoic (ca. 1.88 Ga).This postdoctoral project aims to characterize the possible sources of metals and fluids in hydrothermal systems responsible for the genesis of the IOCG deposits from Carajás (e.g., Sossego, Salobo, Alvo 118, Castanha and Bacaba), which were formed during distinct metallogenic events. This study tries to establish the relationship between the sources of metals for these deposits and the magmatic evolution of the Carajás Province, considering the role of magmatic and externally-derived fluids, as well as possible inheritances from mafic, ultramafic and felsic rocks through mechanisms of fluids-rock interaction. In this sense, the use of isotope signatures (Pb-Pb, Sm-Nd e 87Sr/86Sr) of ore, gangue hydrothermal minerals and host rocks as tracers of sources and processes of lixiviation and redistribution of metals comprehends a useful tool for this study. | |
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