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 Opportunities: Regular Research Grants
• Start date: May 01, 2008
• End date: February 28, 2011
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Silvio Roberto Farias Vlach
• Grantee: Silvio Roberto Farias Vlach
• Host 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)

Scientific publications

(12)

(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)

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, DEC 2011. (08/00562-0, 05/58688-1)

VILALVA, FREDERICO C. J.; VLACH, SILVIO R. F.; SIMONETTI, ANTONIO. Chemical and O-isotope compositions of amphiboles and clinopyroxenes from A-type granites of the Papanduva Pluton, South Brazil: Insights into late- to post-magmatic evolution of peralkaline systems. CHEMICAL GEOLOGY, v. 420, p. 186-199, JAN 20 2016. (08/00562-0)

VLACH, SILVIO R. F.. Micro-structural and compositional variations of hydrothermal epidote-group minerals from a peralkaline granite, Corupa Pluton, Graciosa Province, South Brazil, and their petrological implications. Anais da Academia Brasileira de Ciências, v. 84, n. 2, p. 407-425, JUN 2012. (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, MAR 2014. (08/00562-0)

VILALVA, F. C. J.; VLACH, S. R. F.. Major- and trace-element composition of REE-rich turkestanite from peralkaline granites of the Morro Redondo Complex, Graciosa Province, south Brazil. MINERALOGICAL MAGAZINE, v. 74, n. 4, p. 645-658, AUG 2010. (08/00562-0)

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, SEP 2019. (08/00562-0)

VLACH, SILVIO R. F.. On the Morphology and Geochemistry of Hydrothermal Crypto- and Microcrystalline Zircon Aggregates in a Peralkaline Granite. MINERALS, v. 12, n. 5, p. 17-pg., 2022-05-01. (08/00562-0, 19/17343-4)

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, MAY 2020. (08/00562-0, 19/17343-4)

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, APR 2013. (08/00562-0)

SIACHOQUE, ASTRID; VILALVA, FREDERICO C. J.; VLACH, SILVIO R. F.. Astrophyllite in peralkaline granites from the Graciosa Province (S-SE Brazil): Insights for magmatic vs. post-magmatic crystallization environments. LITHOS, v. 432, p. 15-pg., 2022-10-01. (08/00562-0, 19/17343-4)

VLACH, SILVIO R. F.; SIGA, OSWALDO, JR.; 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, p. 9-pg., 2011-12-01. (05/58688-1, 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, OCT 2021. (08/00562-0, 19/17343-4, 09/04321-0)