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Identification of source areas and crystallization conditions of granitic magmas based on mineral and rock geochemistry

Grant number: 19/17550-0
Support Opportunities:Regular Research Grants
Duration: March 01, 2020 - February 28, 2023
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal Investigator:Valdecir de Assis Janasi
Grantee:Valdecir de Assis Janasi
Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated researchers:Adriana Alves ; Lucelene Martins ; Sandra Andrade


The project has as main object of study occurrences of "classical" granite rocks from the geology of the SE of Brazil (Itu and Socorro batoliths; Pedra Branca Syenite, Atibaia Granite and Piracaia Monzodiorite), whose basic geological, petrographic and geochronological characteristics were established in previous studies. Thus, they are prone to in-depth studies of magma generation processes, identifying source areas in the crust and mantle, and to the identification of evolution processes in magmatic chambers (fractional crystallization, magma mixing, contamination) using as a main tool elemental and isotopic geochemistry (Sr-Nd-Hf). The crystallization conditions of the rocks (temperature, pressure, oxygen fugacity) will be investigated with modern in situ geochemical tools, involving main minerals (feldspars, amphiboles) and accessories (apatite, zircon, titanite). In parallel, in view of the importance of understanding the role of granites throughout the neoproterozoic regional tectonic cycle, the project opens a specific line of research on early granitic magmatism, which is registered as expressive bodies of orthognaisses, so far not systematically studied. (AU)

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Scientific publications (4)
(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)
MORAES, LUCAS VARGAS; FLORISBAL, LUANA MOREIRA; JANASI, VALDECIR DE ASSIS; BITENCOURT, MARIA DE FATIMA; MARTINS, LUCELENE; HEAMAN, LARRY M.; SHAULIS, BARRY; STERN, RICHARD. Elemental and isotopic (Sr-Nd-O) geochemistry and U-Pb zircon geochronology of late-stage, post-collisional, shallow-level magmatism in the Dom Feliciano Belt northern sector. LITHOS, v. 442, p. 19-pg., . (15/01817-6, 19/17550-0)
TOLEDO, BARBARA BUENO; JANASI, VALDECIR DE ASSIS. Petrogenesis of Granites from the Ediacaran Socorro Batholith, SE Brazil: Constraints from Zircon Dating, Geochemistry and Sr-Nd-Hf Isotopes. JOURNAL OF EARTH SCIENCE, v. 32, n. 6, SI, p. 1397-1414, . (15/01817-6, 19/17550-0)
ALVES, ADRIANA; JANASI, VALDECIR DE ASSIS; PEREIRA, GIOVANNA DE SOUZA; PRADO, FERNANDO ARAUJO; MUNOZ, PATRICIO R. M.. Unravelling the hidden evidences of magma mixing processes via combination of in situ Sr isotopes and trace elements analyses on plagioclase crystals. LITHOS, v. 404-405, . (11/07074-4, 07/08683-9, 19/17550-0)
JANASI, VALDECIR DE ASSIS; MARTINS, LUCELENE; ALVES, ADRIANA; SIMONETTI, ANTONIO; HENRIQUE-PINTO, RENATO. The Neoproterozoic Agudos Grandes granitic batholith, SE Brazil: Inferences on source areas from elemental and Sr-Nd-Pb isotope geochemistry. Journal of South American Earth Sciences, v. 130, p. 14-pg., . (15/01817-6, 19/17550-0)

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