Caracterização e evolução de hedenberguita-hastingsita-biotita-granada ortognaisse na região da zona de paleo-sutura de alterosa, porção sul do orógeno brasília meridional

Autor: Leme, Thaís Güitzlaf [UNESP], Navarro, Guillermo Rafael Beltran [UNESP], Zanardo, Antenor [UNESP], Lima, Filipe Goulart, Montibeller, Cibele Carolina [UNESP]
Přispěvatelé: Universidade Estadual Paulista (UNESP), Universidade Federal de Uberlândia (UFU)
Jazyk: angličtina
Rok vydání: 2020
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Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Made available in DSpace on 2022-05-01T03:58:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) In the southwest of Minas Gerais state, Santa Cruz do Prata district region, inserted in a context of high-pressure rocks attributed to the Araxá Group, in the southern portion of the Southern Brasília Orogen, an occurrence of hedenbergite-hastingsite-biotite-garnet orthogneiss body was recorded, whose mineral association is uncommon. This paper presents petrography, mineral chemistry, geochemistry, geothermobarometry, and model age data of the occurrence. The orthogneiss configures a lenticular body, oriented according to the E-W direction, parallel to the direction of the regional shear zones. It has isotropic to anisotropic structure and it can show much more foliated and oriented domains, as result of the greater degree of deformation. The mineral association present in the less deformed portions (andesine + orthoclase + quartz + garnet + hedenbergite), the textural and petrological features in line with the chemical and isotopic data, suggest a paleoproterozoic igneous protolith, metamorphosed into granulite facies (high pressure). The calculated pressure and temperature conditions (around 11.0-10.5 kbar and 750-700ºC) correspond to the regional metamorphic re-equilibration. Geochemical data indicate characteristics similar to rocks generated in magmatic arcs. Instituto de Geociências e Ciências Exatas Departamento de Geologia Universidade Estadual Paulista Campus de Rio Claro Instituto de Geografia Universidade Federal de Uberlândia Campus de Monte Carmelo Instituto de Geociências e Ciências Exatas Departamento de Geologia Universidade Estadual Paulista Campus de Rio Claro FAPESP: 2013/04235-2
Databáze: OpenAIRE
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