Characterization and Geological Meaning of the Crystalline Basement Occurrence in the Unaí Region, Minas Gerais State (Central Brasilia Belt)
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| Format: | Artículo científico |
| Language: | en |
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Universidade Federal do Rio de Janeiro
2023
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| _version_ | 1876440213408972800 |
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| author | Florença das Graças Moura |
| author_facet | Florença das Graças Moura |
| contents | Characterization and Geological Meaning of the Crystalline Basement Occurrence in the Unaí Region, Minas Gerais State (Central Brasilia Belt) Florença das Graças Moura José Eloi Guimarães Campos Geología Tonalite Brasília Belt Crystalline basement Granitoid rocks petrographically and compositionally characterized as tonalite, monzonite granodiorite and granite were observed in restricted areas in the central portion of the external zone of the Brasilia Belt. These outcrops of peraluminous rocks were interpreted as the sialic basement of the region, associated with paleogeographic highs prior to the deposition of the Proterozoic sedimentary cover. U-Pb zircon age of 2.14 Ga and geochemical analysis are compatible with other Paleoproterozoic bedrock areas observed mainly in the north Brasilia Belt. The existence of a basement bulkhead conditioned the Neoproterozoic deformation, causing the inflection of regional structures from NNW to N60-70W and over again to the NNW regional trend. The absence of contact metamorphism along the adjacent supracrustal rocks, regional foliation attitude that is different from that observed in the granitoids (tonalite, granotiorite, monzonite and granite) and the older age, show that these rocks represent basement windows and not younger intrusive bodies, as previously interpreted. The rocks studied in this research are correlated to the Aurumina Suite, which represents the main basement rock set in the North Brasília Belt. 2023 artículo científico 0101-9759 https://www.redalyc.org/articulo.oa?id=695375062021 https://www.redalyc.org/journal/6953/695375062021/ https://www.redalyc.org/journal/6953/695375062021/html/ https://www.redalyc.org/journal/6953/695375062021/695375062021.epub https://www.redalyc.org/journal/6953/695375062021/movil 10.11137/1982-3908_2023_46_46563 en http://www.redalyc.org/revista.oa?id=6953 Anuário do Instituto de Geociências application/pdf Universidade Federal do Rio de Janeiro Anuário do Instituto de Geociências (Brasil) Vol.46 |
| format | Artículo científico |
| id | redalyc_695375062021 |
| institution | Redalyc |
| language | en |
| publishDate | 2023 |
| publisher | Universidade Federal do Rio de Janeiro |
| spellingShingle | Characterization and Geological Meaning of the Crystalline Basement Occurrence in the Unaí Region, Minas Gerais State (Central Brasilia Belt) Florença das Graças Moura Geología Tonalite Brasília Belt Crystalline basement Characterization and Geological Meaning of the Crystalline Basement Occurrence in the Unaí Region, Minas Gerais State (Central Brasilia Belt) Florença das Graças Moura José Eloi Guimarães Campos Geología Tonalite Brasília Belt Crystalline basement Granitoid rocks petrographically and compositionally characterized as tonalite, monzonite granodiorite and granite were observed in restricted areas in the central portion of the external zone of the Brasilia Belt. These outcrops of peraluminous rocks were interpreted as the sialic basement of the region, associated with paleogeographic highs prior to the deposition of the Proterozoic sedimentary cover. U-Pb zircon age of 2.14 Ga and geochemical analysis are compatible with other Paleoproterozoic bedrock areas observed mainly in the north Brasilia Belt. The existence of a basement bulkhead conditioned the Neoproterozoic deformation, causing the inflection of regional structures from NNW to N60-70W and over again to the NNW regional trend. The absence of contact metamorphism along the adjacent supracrustal rocks, regional foliation attitude that is different from that observed in the granitoids (tonalite, granotiorite, monzonite and granite) and the older age, show that these rocks represent basement windows and not younger intrusive bodies, as previously interpreted. The rocks studied in this research are correlated to the Aurumina Suite, which represents the main basement rock set in the North Brasília Belt. 2023 artículo científico 0101-9759 https://www.redalyc.org/articulo.oa?id=695375062021 https://www.redalyc.org/journal/6953/695375062021/ https://www.redalyc.org/journal/6953/695375062021/html/ https://www.redalyc.org/journal/6953/695375062021/695375062021.epub https://www.redalyc.org/journal/6953/695375062021/movil 10.11137/1982-3908_2023_46_46563 en http://www.redalyc.org/revista.oa?id=6953 Anuário do Instituto de Geociências application/pdf Universidade Federal do Rio de Janeiro Anuário do Instituto de Geociências (Brasil) Vol.46 |
| title | Characterization and Geological Meaning of the Crystalline Basement Occurrence in the Unaí Region, Minas Gerais State (Central Brasilia Belt) |
| topic | Geología Tonalite Brasília Belt Crystalline basement |
| url | https://www.redalyc.org/articulo.oa?id=695375062021 https://www.redalyc.org/journal/6953/695375062021/ https://www.redalyc.org/journal/6953/695375062021/html/ https://www.redalyc.org/journal/6953/695375062021/695375062021.epub https://www.redalyc.org/journal/6953/695375062021/movil |