My research revolves around Crustal Evolution. I have great interests in understanding genetic and evolutionary processes, with emphasis on the origin and development of the Earth’s continental crust, global geological changes, Precambrian geology, tectonics in the Archean and mantle-crust-atmosphere interaction processes.
The generation and evolution of the Earth’s continental crust is one of the fundamental topics of discussion and challenge within the geosciences community; it involves the environment in which life originated, the development of plate tectonics and the formation of mineral deposits. The building of the Earth’s continental crust is a complex process that includes the generation of primary basic melts and water-assisted chemical differentiation to more felsic compositions. The chemical differentiation is in effect a distillation process, and understanding the role of the lithosphere as a trap and/or reactive filter during the distillation process is key for the multi-stage mechanisms that allow melts to differentiate. The compositional range of terrestrial magmatic rocks changes with time. For example, TTG’s dominated the Paleoarchean, sanukitoids appear at the Mesoarchean and potassic rocks become more widespread in the Neoarchean.
There is currently much discussion over the extent to which plate tectonics was active before 3 Ga, and the São Francisco Craton provides an excellent testing ground as it preserves pristine continental crust from the period 3.6 to 3.3 Ga. Unusually there are well-preserved high-silica rhyolites and coeval granite erupted at 3.3 Ga, and key aspects of my actual project are to establish the conditions of volcanism, to develop new approaches to evaluate the links between volcanic and plutonic activity, and hence to explore the conditions under which the plutonic rocks were generated. For the 3.6-3.3 Ga TTG and potassic magmatism the emphasis will be on the identification of magmas sources, the age and distribution of any pre-existing crust, and the detection of contributions from supracrustal components. Many of these rocks were derived from pre-existing crustal rocks, and the combination of Hf-O-Nd142-W isotopes will be used to determine the element ratios of those crustal source rocks and to look for Hadean crustal differentiation signals.
The objective is to provide new insights into the processes related to the growth of the continental crust at this key time in Earth History, the extent to which plate tectonics was already operative, and the processes that may have contributed to the stabilization of continental nuclei in the Mid-Archaean. A particular challenge is to establish the extent to which the processes that triggered the generation of the granite-greenstone terrains were similar to those responsible for the petrogenesis of felsic volcanics and coeval plutons.
2016-now: Professor at the University of Ouro Preto, Brazil
2012-2013: Professor of Mining Engineering at the University of Alfenas – UNIFAL, Brazil.
2012-2016: PhD research, University of Campinas, Brazil
2009-2011: Master research, University of Campinas, Brazil
2004-2009: Degree in Geology, University of Campinas, Brazil
List of publication
– Zincone, S. A., Oliveira, E. P., Laurent, O., Zhang, H., Zhai, M. (2016). 3.30 Ga high-silica intraplate volcanic–plutonic system of the Gavião Block, São Francisco Craton, Brazil: Evidence of an intracontinental rift following the creation of insulating continental crust. Lithos, 266, 414-434.
– Ancelmi, M. F., dos Santos, T. J. S., da Silva Amaral, W., Fuck, R. A., Dantas, E. L., Zincone, S. A. (2015). Provenance of metasedimentary rocks from the Ceará Central Domain of Borborema Province, NE Brazil: implications for the significance of associated retrograded eclogites. Journal of South American Earth Sciences, 58, 82-99.
– Zincone, S. A., Oliveira, E. P. Field and Geochronological evidence for origin of the Contendas-Mirante Supracrustal Belt, São Francisco Craton, Brazil, as a Paleoproterozoic foreland basin. In review at Precambrian Research.
– Zincone, S. A., Oliveira, E. P. Barbuena, D., Baldim, M.R. Detrital zircon U-Pb geochronology of the Saúde Complex: implications for the Evolution of the Itabuna-Salvador-Curaçá Orogen, São Francisco Craton, Brazil. In review at Journal of South America Earth Science.
– Zincone et al. Paleoarchean evidence of continuous magmatic differentiation into the generation of proto-continents. In prep.
– Zincone, S. A., Oliveira, E. P., Ribeiro, B., Marinho, M.M. Accretionary system between distinct Archean terranes: high-grade metamorphism, strike-slip tectonics, basement exhumation, basin infill, gabbroic intrusion and coeval volcanism during early assemblage of the São Francisco craton, Brazil: implications for Atlantica Continent. In prep.
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