MARI CURIE RESEARCH FELLOW – GENEVE UNIVERSITY

 

BRAZIL PROJECT

Production and emplacement of potassic magmas as a mechanism of stabilization for the Southern São Francisco Craton, SE Brazil

PROJECT SUMARY: The Southern São Francisco Craton in southeast Brazil encompasses one of the largest segments of meso- to late-Archaean crust in South America. The craton is made of  complexes formed by Na-rich gneiss and granitoids as well as calc-alkaline slightly to non-deformed granites. Previous studies show that the Archaean crust experienced massive intrusions of calc-alkaline granitoid magma(exposed over an area of ~25000 km2) during a long-lived period ofmagmatism from 2760 to 2700 Ma. This magmatic event marked the beginning of a fundamental change in the tectonics of the terrain, with the ensuing billion years being dominated by the deposition of a series of thick clastic and chemical sedimentary successions. Thus, deep crustal partial melting, transport and intrusion of these granites into the upper crust is a likely mechanism by which the Southern São Francisco crust attained itsbuoyancy. This project is focused on the study of the genesis and evolution of both Na- and K-rich (i.e. TTG and calc-alkaline)granitoids. The main objective of the project is the understanding of the mechanism leading to the switch in the chemical composition of the continental crust produced. In this projectI combine detailed field, geochemical and isotopic studies of the granitoids exposed in the Southern São Francisco Craton in order to understand the origin of the craton.

PUBLICATIONS

 

  1. Narduzzi F., Farina F., Stevens G., Lana C., Nalini Jr H.A., 2017. Magmatic garnet in the Cordilleran-type Galiléia granitoids of the Araçuaí belt (Brazil): Evidence for crystallization in the lower crust. Lithos, 282-283, 82-97.
  2. Aguilar C., Alkmim FF., Lana C., Farina F., 2017. Palaeoproterozoic assembly of the São Francisco craton, SE Brazil: New insights from U–Pb titanite and monazite dating. Precambrian Research, 289, 95-115.
  3. Albert C., Farina F., Lana C., Stevens, G., Storey, C., Gerdes, A., Martínez Dopico C., 2016. Archean crustal evolution in the Southern São Francisco craton, Brazil: Constraints from U-Pb, Lu-Hf and O isotope analyses. Lithos, 266-267, 64-86.
  4. Farina F., Albert C., Martínez Dopico C., Aguilar Gil C., Moreira H., Hippertt J.P., Cutts K., Alkmim F.F., Lana C., 2016. The Archean–Paleoproterozoic evolution of the Quadrilátero Ferrífero (Brasil): Current models and open questions. Journal of South American Earth Sciences, 68, 4-21.
  5. Westerman D.S., Rocchi S., Dini A., Farina F., Roni E., 2016. Rise and Fall of a Multi-sheet Intrusive Complex, Elba Island, Italy. In: Physical Geology of Shallow Magmatic Systems. Dykes, Sills and Laccoliths. Ed. C. Breitkreuz and S. Rocchi. Springer. Series ISSN: 2364-3277. Advances in Volcanology.
  6. Farina F., Albert, C., Lana, C., 2015. The Neoarchean transition between medium- and high-K granitoids: Clues from the Southern São Francisco Craton (Brazil). Precambrian Research, 266, 375-394.
  7. Farina F., Stevens G., Gerdes A., Frei D., 2014. Small-scale Hf isotopic variability in the Peninsula pluton (South Africa): the processes that control inheritance of source 176Hf/177Hf diversity in S-type granites. Contributions to Mineralogy and Petrology, 168, 1065. DOI: 10.1007/s00410-014-1065-8.
  8. Farina F., Dini A., Rocchi S., Stevens G., 2014. Extreme mineral-scale Sr isotope heterogeneity in granites by disequilibrium melting of the crust. Earth and Planetary Science Letters, 399, 103-115. DOI: 10.1016/j.epsl.2014.05.018.
  9. Gonçalves L.E.S., Farina F., Lana C., Pedrosa-Soares A.C., Alkmim F.F., Stevens G., Nalini Jr. H.A, 2014. Source diversity of a magmatic arc developed in a confined orogenic setting (Araçuai orogen, southeastern Brazil). Journal of South American Earth Sciences, 52, 129-148.
  10. Farina F., Stevens G., Villaros, A., 2012 Multi-batch, incremental assembly of a dynamic magma chamber: the case of the Peninsula pluton granite (Cape Granite Suite, South Africa). Mineralogy and Petrology, 106, 3-4, 193-216.
  11. Farina F., Stevens G., Dini A., Rocchi S., 2012. Peritectic phases entrainment and magma mixing: origin of the chemical variability of the Elba Island granitic complex (Italy). Lithos, 153, 243-260. DOI: http://dx.doi.org/10.1016/j.lithos.2012.05.011
  12. Clemens J.D., Stevens G., Farina F. 2011. The enigmatic sources of I-type granites: the peritectic connexion. Lithos, 126, 174-181.
  13. Farina F., Stevens G., 2011. Source controlled 87Sr/86Sr isotope variability in granitic magmas: the inevitable consequence of mineral-scale isotopic disequilibrium in the protolith. Lithos, 122, 189-200.
  14. Dini A., Rocchi S., Westerman S.D., Farina F., The late Miocene intrusive complex of Elba Island: two centuries of studies from Savi to Innocenti. Acta Vulcanologica, 20- 21, 11-32.
  15. Rocchi S., Westerman S.D., Dini A., Farina F., Intrusive sheets and sheeted intrusions at Elba Island (Italy). Geosphere, v. 6, 3, 225-236.
  16. Farina F., Dini A., Innocenti F., Rocchi S., Westerman S.D., 2010. Rapid incremental assembly of the Monte Capanne pluton (Elba Island, Tuscany) by downward stacking of magma sheets. Geological Society of America Bulletin, 122, 1463-1479.
  17. Farina F., Building the Monte Capanne pluton (Elba Island, Italy) by multiple magma batches. Plinius, 34.
  18. Dini A., Farina F., Innocenti F., Rocchi S., Westerman S.D., 2007. Monte Capanne Pluton revisited 40 years after Giglia’s contributions. Rendiconti Società Geologica Italiana, 5, 2

CONTACTS:

CELL: +553189432021

EMAIL: fannak@gmail.com

 
 

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