Petrography and geochemistry of gneisses from Indiara region, central portion of the Goiás magmatic arc

Authors

  • Guillermo Rafael Beltran Navarro Departamento de Petrologia e Metalogenia, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP
  • Antenor Zanardo Departamento de Petrologia e Metalogenia, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP
  • Cibele Carolina Montibeller Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP (Pós-graduação em Geociência e Meio Ambiente, Instituto de Geociências e Ciências Exatas)
  • Fabiano Tomazini da Conceição Departamento de Planejamento Territorial e Geoprocessamento, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP
  • Claudio de Morisson Valeriano Faculdade de Geologia, Departamento de Geologia Regional e Geotectônica, Universidade do Estado do Rio de Janeiro - UERJ

DOI:

https://doi.org/10.11606/issn.2316-9095.v17-430

Keywords:

Gneisses, Brasília Belt, Tocantins Province.

Abstract

In the region of Indiara, Goiás, there is an extensive belt of gneisses related to the Goiás Magmatic Arc, near the contact with the supracrustal rocks of the Anicuns-Itaberaí Metavolcanosedimentary Sequence. Although rocks from different locations associated with the Goiás Magmatic Arc have similar petrographic characteristics, geochemical and isotopic data show that the gneisses of Indiara region are not chemically similar to the rocks of type regions from the Arc (regions of Arenópolis, –Firminópolis, – Iporá and Mara Rosa). They have calcium-alkaline and peraluminous character, with predominantly granitic composition, in contrast to the prevalently calcic and metaluminous character of the type region, which also presents dominantly tonalitic to granodioritic compositions. The high SiO2 content, strongly peraluminous character and the high levels of normative corundum suggest that the gneisses of Indiara region are derived from Type-S syn-collisional granites and/or are related to mixing of igneous and sedimentary protoliths. TDM model ages (1.88 and 1.90 Ga) suggest that the gneisses of this region evolved from sialic crust older than the rocks that form the Goiás Magmatic Arc.

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Published

2017-09-01

Issue

Vol. 17 No. 3 (2017)

Section

Articles

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How to Cite

Navarro, G. R. B., Zanardo, A., Montibeller, C. C., Conceição, F. T. da, & Valeriano, C. de M. (2017). Petrography and geochemistry of gneisses from Indiara region, central portion of the Goiás magmatic arc. Geologia USP. Série Científica, 17(3), 189-207. https://doi.org/10.11606/issn.2316-9095.v17-430