Scholarship 13/25659-5 - Geoquímica isotópica - BV FAPESP
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ISOTOPE GEOCHEMISTRY (Sr, Nd e Pb) APPLIED TO THE STUDY OF NEOARCHEAN AND PALEOPROTEROZOIC IRON OXIDE-COPPER-GOLD SYSTEMS IN THE CARAJÁS PROVINCE: TRACING THE SOURCES OF METALS AND FLUIDS

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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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)
BETTENCOURT, JORGE SILVA; JULIANI, CAETANO; XAVIER, ROBERTO P.; MONTEIRO, LENA V. S.; BASTOS NETO, ARTUR C.; KLEIN, EVANDRO L.; ASSIS, RAFAEL R.; LEITE, WASHINGTON BARBOSA, JR.; MORETO, CAROLINA P. N.; DIAS FERNANDES, CARLOS MARCELLO; et al. Metallogenetic systems associated with granitoid magmatism in the Amazonian Craton: An overview of the present level of understanding and exploration significance. Journal of South American Earth Sciences, v. 68, p. 28-pg., . (09/18371-0, 13/25659-5)
BETTENCOURT, JORGE SILVA; JULIANI, CAETANO; XAVIER, ROBERTO P.; MONTEIRO, LENA V. S.; BASTOS NETO, ARTUR C.; KLEIN, EVANDRO L.; ASSIS, RAFAEL R.; LEITE, JR., WASHINGTON BARBOSA; MORETO, CAROLINA P. N.; DIAS FERNANDES, CARLOS MARCELLO; et al. Metallogenetic systems associated with granitoid magmatism in the Amazonian Craton: An overview of the present level of understanding and exploration significance. Journal of South American Earth Sciences, v. 68, n. SI, p. 22-49, . (13/25659-5, 09/18371-0)
DEMELO, GUSTAVO H. C.; MONTEIRO, LENA V. S.; XAVIER, ROBERTO P.; MORETO, CAROLINA P. N.; SANTIAGO, ERIKA S. B.; ANDREW DUFRANE, S.; AIRES, BENEVIDES; SANTOS, ANTONIO F. F.. Temporal evolution of the giant Salobo IOCG deposit, Carajas Province (Brazil): constraints from paragenesis of hydrothermal alteration and U-Pb geochronology. MINERALIUM DEPOSITA, v. 52, n. 5, p. 709-732, . (13/25659-5, 09/18371-0)

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