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Volume 32 Issue 6
Dec 2021
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Article Contents
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

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
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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
  • The Gentio metagranitoid presents equigranular and porphyritic facies, modal composition ranging from tonalite to monzogranite with calculated TZr < 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 TDM ages vary from 2.4 to 2.8 Ga with εNd(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.

     

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