FCT - Faculdade de Ciências e Tecnologia

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    Relatório final do mapeamento geológico 1:50.000 da região de Anicuns (GO) - área 3
    (Universidade Federal de Goiás, 2021-11-25) Aguiar, Pedro Guilherme do Carmo Gonçalves de; Gontijo, Rafael Ayres; Melo, Rodrigo Prudente de; Santos, Marcelo Henrique Leão; Santos, Marcelo Henrique Leão; Heringer, Rodrigo de Almeida; Reis, Mateus Andrade
    This work presents the results of the 1:50,000 scale geological mapping, performed in Anicuns, Goiás. The region is located in the Brasília Belt context,inserted at contact between the Anicuns-Itaberaí Metavulcanosedimentary Sequence (AIS) and the Anápolis-Itauçu Complex (AIC). This mapping aimed to characterize the geological units, starting with the literature review, photolithological, geochemical and geophysical interpretations. After the field stage and petrographic description, six lithostratigraphic units were defined. The AIS has three units mapped in the area, the basic-ultrabasic unit, which include tremolite-talc-schists, tremolitites and amphibolites, some serpentinized with mineralogical assemblages indicating amphibolite facies; carbonated rhythmic unit, which includes intercalations of quartzite magnetite, metalimestones, marbles and metarrhythmites, affected by reverse faults associated with thrust zones; and, psamopelitic unit represented by intercalations between quartz mica-schists (with or without garnet) and quartzites. The AIC represents gneiss rocks that underwent retrometamorphism leaving the granulite facies to high amphibolite, in the area they are identified as amphibolite orthogneisses with a composition containing quartz, biotite, epidote, garnet, plagioclase, hornblende and pyroxene being uralitized; and amphibolite paragneisses represented by biotite-muscovite gneisses, muscovite-garnet gneisses, garnet-muscovite-biotite schist with or without sillimanite and calciosilicate gneisses. Finally, the Tonian granitegneisses represented by the granodiorite creoulos with porphyritic, leucocratic texture, rich in biotite and muscovite, with the presence of hornblende also being common. The entire area is affected by three deformation phases associated with the third event of the Brasiliana Orogenesis (~790-545 Ma).