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Item Mapeamento geológico da região das nascentes do Rio Vermelho e arredores no município de Goiás (GO) em escala 1:20.000(Universidade Federal de Goiás, 2023-08-29) Gomes, Camila de Sousa; Altoé, Elisandro Seraco; Macedo, Sarah Karoline Costa; Rodrigues, Sérgio Wilians de Oliveira; Rodrigues, Sérgio Wilians de Oliveira; Lima, Martha Noélia; Carneiro, Jônatas de Sales MacedoThe present work consists of a detailed geological mapping study in the region of the headwaters of the Vermelho River and adjacent areas in the municipality of Goiás (GO), carried out at a scale of 1:20,000. The main objective of the study was to analyze and describe the geological characteristics of the region, aiming to understand its geological and structural evolution. The adopted methodology involved fieldwork, analysis of collected data, such as direct observations of rocks and geological structures, as well as the collection of samples for petrographic and geochemical analysis. Additionally, geophysical data and topographical survey information were used to assist in the interpretation of geological features. Fourteen lithological units and alluvial cover were identified. These units were placed in the context of existing literature. Petrographic analyses allowed the characterization of rocks in terms of mineralogy and texture, contributing to the interpretation of formation and metamorphic conditions. Geochemical analyses aided in understanding the chemical characteristics of the rocks, providing insights into the provenance of the rocks and associated geological processes. This geological mapping study provides important insights into the geology of the study area, such as the relationships between the mafic-ultramafic rocks of the Goiás Velho Group and the Caiçara Complex, and between these rocks and the Serra Dourada Group. The findings are relevant not only for understanding the local geological evolution but also for comprehending geological phenomena in broader contexts. Furthermore, the mapping serves as instrumental material for Ediminas Mineração Ltda, providing support in the context of their mineral exploration activities.Item Mapeamento geológico em escala de semidetalhe (1:50.000) na porção sudeste do município de Campinaçu – GO(Universidade Federal de Goiás, 2024-07-31) Rocha, Eric Gonzaga; Secco, Henrique Pereira; Temporim, Filipe Altoé; Reis, Mateus Andrade; Reis, Mateus Andrade; Rodrigues, Sérgio Wilians de Oliveira; Cavalcanti, Débora EzequielThe municipality of Campinaçu has economic potential related to various mineral deposits, with emphasis on gold, a mineral that has a history of mining in the Serra Grande region, popularly known as Serra do Buracão. The mapping area is located in the inner zone of the Brasília Belt, more specifically in the Serra da Mesa Group. Geological mapping in the region of interest used geoprocessing, photogeology, field mapping and sampling, scouting campaigns, petrographic and petrological analyzes to create a geological map at a scale of 1:50,000. After mapping, three main lithostratigraphic units were delimited, namely: Garnet shale-mica schist, composed of garnet-biotite-sericite schist, biotite-sericite schist, biotite-muscovite schist, a faciological variation with the presence of carbonaceous shale schist lenses; Quartzite, consisting of muscovite quartzite with centimeter lenses of mica schist; Mica schist with lenses of fine quartzite and calcschist. With the delimitation of lithological contacts, it was possible to generate a stratigraphic column for the area. The structural features mapped are the result of 4 (four) deformational events (D1, D2, D3 and D4), related to tectonic events west of the Rio Maranhão System, where the deformation of the Serra da Mesa rocks is polyphasic. These events were responsible for the generation of schistosities, spaced cleavage and crenulation, veins and folds. The economic potential of the region is related to gold mineralization, which may have generated a phylonian gold deposit in detrital metasediments, where milky quartz veins larger than 50cm, discordant with the foliations, have the potential to host free gold. The veins occur both north and south of Serra do Buracão, in addition to its crest, evidenced by isotheor maps of the distribution of this element. These veins are oriented in the NNE-SSW and W-E directions, associated with the D3 event. Chemical analysis showed a positive correlation between gold and elements such as lithium, lead, titanium, sulfur, zinc and zirconium.Item Mapeamento geológico-estrutural e estudo do potencial exploratório de mineralizações auríferas em metadolomitos da área adjacente a unidade Mineração Serra Grande, município de Crixás (GO)(Universidade Federal de Goiás, 2024-05-03) Santos, Karina Louanny de Paula; Souza, Lauriana Vitória Gonçalves; Machado, Victtor Gabriell de Lima; Melo, Rodrigo Prudente de; Rodrigues, Sérgio Wilians de Oliveira; Rodrigues, Sérgio Wilians de Oliveira; Melo, Rodrigo Prudente de; Schroeder, James; Nogueira Neto, José de AraújoThe mineral deposits of the Crixás Greenstone belt (GBC) are inserted in the context of the Goiás Granite-Greenstone belts Terranes and comprise one of the largest gold reserves in Brazil. The ore bodies explored in Mineração Serra Grande (MSG) unit encompass several lithotypes with mineralization hosted in zones closely related to structural and hydrothermalized domains. The gold mineralizations hosted in Structure IV metadolomites of the Ribeirão das Antas Formation are one of the main challenges of the operation, due to the complexity of the mineralization model, which is still unexplored in calciosilicate rocks from Greenstone belt environments. This work aimed at geological-structural mapping on a 1:15,000 scale of an area of approximately 27 km2 located on the western and southern margins of the Serra Grande Mining site, the study of exploratory potential for the metadolomites of the Ribeirão das Antas Formation was also commented, especially for the layers that are expoused on surface to the south of the mapped area. Three deformational events were identified in the area: D0+D1, D2 and D3 which correspond, respectively, to S0//S1, referring to the primary bedding parallel to the schistosity generated by an E-W compression; S2, referring to a schistosity generated by the thrusting of the Mara Rosa Magmatic Arc at north of the GBC; and S3, which summarizes an E-W compression reported in crenulation cleavages. Field data obtained from surface, mine mapping and description of drilling cores integrated with three-dimensional geological models were used to evaluate the exploratory potential of the metadolomite bodies outcropping in the southern portion of the MSG and their relationship with the mineralized structures in other areas of the deposit. The product generated in this work aims to expand knowledge of the geometry and spatiality of these lithologies in order to facilitate and reduce initial costs of advanced drilling campaigns in the area, in addition to proposing a model of interaction between the gold mineralizations of these layers and the explored structures in MSG.Item Metamorfismo da sequência Anicuns-Itaberaí na região de Nazário-GO(Universidade Federal de Goiás, 2024-07-22) Brod, Gabriel Silveira; Vieira, Otávio Passo; Melo, Rodrigo Prudente de; Temporim, Filipe Altoé; Temporim, Filipe Altoé; Cavalcanti, Débora Ezequiel; Grella, João VictorThe Anicuns-Itaberaí Sequence is one of the metavolcanosedimentary sequences that make up the Arenópolis Magmatic Arc. However, even with the abundance of research found in the literature related to geochemical, isotopic and geochronological aspects, there is still little material on petrology and structural geology with a focus on the metamorphic evolution of these rocks, which makes the tectono-metamorphic evolution of these sequences still poorly understood. This work aimed to establish, through geological mapping, structural interpretation and petrological studies, a greater understanding of the metamorphic conditions (P-T) that the rocks of the Anicuns-Itaberaí Sequence were subjected to during the metamorphic evolution of the Brasília belt. The results of this work include geological mapping on a scale of 1:50,000 of the region bordering the municipalities of Anicuns, Avelinópolis, Nazário and Palmeiras de Goiás. It also includes the integration of structural, microstructural and petrological data, and the creation of compositional maps of two samples of garnet-chlorite-biotite-muscovite schist from the area that were made using XMapTools software from electron microprobe data. The mineral assemblage of these rocks, given by garnet + plagioclase + biotite + muscovite + quartz + chlorite, was modeled geothermobarometrically using the Bingo-Antidote extension. The modeling results suggest that the metamorphic peak occurred in amphibolite facies conditions (staurolite zone), with retrometamorphism during crustal exhumation to green schist facies conditions. The results show small differences in values between the samples. In sample 23GO_022-P1 the conditions obtained were 630.9 °C and 1.007 GPa for the peak of metamorphism and 536.6 °C and 0.588 GPa for retrometamorphism, while for sample 23GO_025-T1 the conditions were 654.2 °C and 1.198 GPa for the metamorphic peak and 569.9 °C and 0.703 GPa for retrometamorphism. These values indicate that, although there is a small difference between the P-T results between the two samples, the P-T amplitude between the metamorphic peak and the retrometamorphism are very similar for the two samples, which suggests that these differences may be related to different levels of burial between the two samples during the metamorphic process. Finally, it should be emphasized that the data presented in this work provides new information on the geological evolution of these rocks and also shows the need for more studies of this type in the area, including geochronological data on metamorphic rocks in order to better understand the relationship between metamorphism and the tectonic events that affected the region.