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Mantle-crust interaction and the genesis and evolution of the A-type: post-collisional magmatism: geochemical and isotopic records from the Graciosa Province, S-SE Brazil

Grant number: 08/00562-0
Support type:Regular Research Grants
Duration: May 01, 2008 - February 28, 2011
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:Silvio Roberto Farias Vlach
Grantee:Silvio Roberto Farias Vlach
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The origin of the post-collisional "A-type" magmatic provinces show important links with processes initiated at the subcontinental mantle and includes several contributions from this mantle and the overlying continental crust. The genesis and evolution of magmas generated in these environments are figures of merit in modern petrology. This project focuses on the identification of various mantle and crustal sources and magmatic evolution processes involved in the origin of the "A-type" granites, syenites, and related rocks from the Graciosa Province, S-SE Brazil. Detailed studies, in part complementary to our ongoing research, will be conducted in selected occurrences of the province, using tools such as field work, petrography, elemental and isotopic whole-rock geochemistry (major, minor, and trace elements, Sr-Nd isotopes), conventional zircon U-Pb dating (TIMS), with enphasis on mineralogical microanalysis (major and minor elements by EPMA and trace elements by LA-ICP-MS in rock-forming and main accessory minerals, Pb isotopes in alkali-feldspar, Hf isotopes in zircon, and zircon U-Pb dating by LA-ICP-MS). It is well demonstrated in the current literature that the integration of the information to be available with these analytical techniques has great potential to identify, evaluate and/or quantity the relative importance of contrasted mante and crustal components to the parental magmas constitution and the subsequent processes of magmatic evolution. Such information will also allow a fine comparison between the province and several analogous occurrences elsewhere in the world. (AU)

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Scientific publications (9)
(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)
VILALVA, FREDERICO C. J.; VLACH, SILVIO R. F.; SIMONETTI, ANTONIO. NACARENIOBSITE-(Ce) AND BRITHOLITE-(Ce) IN PERALKALINE GRANITES FROM THE MORRO REDONDO COMPLEX, GRACIOSA PROVINCE, SOUTHERN BRAZIL: OCCURRENCE AND COMPOSITIONAL DATA. CANADIAN MINERALOGIST, v. 51, n. 2, p. 313-332, . (08/00562-0)
SIACHOQUE, ASTRID; SANTOS, CAIO A.; VLACH, SILVIO R. F.. Amphiboles and phyllosilicates in the A-type Mandira Granite Massif, Graciosa Province, SE Brazil: Textures, composition and crystallisation conditions. MINERALOGICAL MAGAZINE, v. 85, n. 5, p. 784-807, . (08/00562-0, 19/17343-4, 09/04321-0)
VLACH, SILVIO R. F.; SIGA, JR., OSWALDO; HARARA, OSSAMA M. M.; GUALDA, GUILHERME A. R.; BASEI, MIGUEL A. S.; VILALVA, FREDERICO C. J.. Crystallization ages of the A-type magmatism of the Graciosa Province (Southern Brazil): Constraints from zircon U-Pb (ID-TIMS) dating of coeval K-rich gabbro-dioritic rocks. Journal of South American Earth Sciences, v. 32, n. 4, SI, p. 407-415, . (05/58688-1, 08/00562-0)
SIACHOQUE, ASTRID; GARCIA, RODOLFO; VLACH, SILVIO R. F.. Occurrence and Composition of Columbite-(Fe) In the Reduced A-Type Desemborque Pluton, Graciosa Province (S-SE Brazil). MINERALS, v. 10, n. 5, . (08/00562-0, 19/17343-4)
JOBIM VILALVA, FREDERICO CASTRO; SIMONETTI, ANTONIO; FARIAS VLACH, SILVIO ROBERTO. Insights on the origin of the Graciosa A-type granites and syenites (Southern Brazil) from zircon U-Pb geochronology, chemistry, and Hf and O isotope compositions. LITHOS, v. 340, p. 20-33, . (08/00562-0)
VILALVA, FREDERICO C. J.; VLACH, SILVIO R. F.. Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province. Anais da Academia Brasileira de Ciências, v. 86, n. 1, p. 85-116, . (08/00562-0)

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