Genesis of the Gentio Metagranitoid: Post-Collisional High-K Plutonism within the Mineiro Belt, São Francisco Craton, Brazil

Marize M. da Silva; Ciro A. Ávila; Felipe M. Tavares; Natali S. Barbosa; Wilson Teixeira

doi:10.1007/s12583-021-1469-0

Volume 32 Issue 6

Dec 2021

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Journal of Earth Science > 2021 > 32(6): 1374-1396.

Marize M. da Silva, Ciro A. Ávila, Felipe M. Tavares, Natali S. Barbosa, Wilson Teixeira. Genesis of the Gentio Metagranitoid: Post-Collisional High-K Plutonism within the Mineiro Belt, São Francisco Craton, Brazil. Journal of Earth Science, 2021, 32(6): 1374-1396. doi: 10.1007/s12583-021-1469-0

Citation:

Marize M. da Silva, Ciro A. Ávila, Felipe M. Tavares, Natali S. Barbosa, Wilson Teixeira. Genesis of the Gentio Metagranitoid: Post-Collisional High-K Plutonism within the Mineiro Belt, São Francisco Craton, Brazil. Journal of Earth Science, 2021, 32(6): 1374-1396. doi: 10.1007/s12583-021-1469-0

Citation:

Marize M. da Silva, Ciro A. Ávila, Felipe M. Tavares, Natali S. Barbosa, Wilson Teixeira. Genesis of the Gentio Metagranitoid: Post-Collisional High-K Plutonism within the Mineiro Belt, São Francisco Craton, Brazil. Journal of Earth Science, 2021, 32(6): 1374-1396. doi: 10.1007/s12583-021-1469-0

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Genesis of the Gentio Metagranitoid: Post-Collisional High-K Plutonism within the Mineiro Belt, São Francisco Craton, Brazil

doi: 10.1007/s12583-021-1469-0

1.
Programa de Pós-graduação em Geologia, Universidade Federal do Rio de Janeiro, 21. 949-900 Rio de Janeiro RJ, Brazil
2.
Museu Nacional, Universidade Federal do Rio de Janeiro, 20940-040 Rio de Janeiro RJ, Brazil
3.
Serviço Geológico do Brasil, Divisão de Geologia Econômica, 22290-255 Rio de Janeiro, Brazil
4.
Instituto de Geociências, Universidade Federal da Bahia, 40170-110 Salvador BA, Brazil

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Corresponding author: Marize M. da Silva, muniz.marize@gmail.com
Received Date: 29 Sep 2020
Accepted Date: 10 Apr 2021
Publish Date: 30 Dec 2021

Abstract

Abstract

The Gentio metagranitoid presents equigranular and porphyritic facies, modal composition ranging from tonalite to monzogranite with calculated T_Zr < 800℃ for most samples. Its mineralogy is dominated by quartz and feldspar (77% to 95%), biotite is the only mafic mineral present (2% to 18%) and, titanite, zircon, apatite, allanite are important accessory phases. These rocks range from metaluminous to weakly peraluminous, and have large variation in major and trace elements, and high alkali contents (> 6 wt.%). Zircon analyses by LA-ICP-MS and SHRIMP yielded a concordia age of 2 119±10 Ma for the porphyritic facies and an upper intercept age of 2 111±15 Ma for the equigranular facies. The whole-rock Sm-Nd T_DM ages vary from 2.4 to 2.8 Ga with ε_Nd(2.1) values between -0.7 and -5.3, indicating crustal derivation from distinct and/or heterogeneous protoliths. Field observations indicate that the Gentio metagranitoid was formed through different pulses of magma. Individual batches were subject to little or even no fractionation process after its emplacement. Although the Gentio metagranitoid crosscuts metamafic and metaultramafic rocks akin to an oceanic arc setting, this pluton is likely originated by partial melting of a more evolved quartz-feldspathic crustal igneous rock in a post-collisional environment, after the accretion of the arcs from the Mineiro belt and rocks of the Mantiqueira Complex.
- high-K granites,
- Mineiro belt,
- post-collisional,
- São Francisco Craton,
- U-Pb geochronology

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References(76)

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