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Aplicação de machine learning para identificação de corpos máficos-ultramáficos na porção sul da faixa Brasília, Goiás, Brasil
(Universidade Federal de Goiás, 2024-08-02) Barros, Lucas Marques; Tabosa, Luiz Fernando Cursino; Temporim, Filipe Altoé; Temporim, Filipe Altoé; Yokoyama, Elder; Lopes, Débora Nogueira
This research investigates the application of Machine Learning in identifying mafic-ultramafic bodies within a 200 km² area in the southern portion of the Brasília Belt, focusing specifically on the boundary between the Anicuns-Itaberaí sequence and the Anápolis-Itauçu Complex, near the municipality of Anicuns, Goiás.. The study applied the Random Forest algorithm to process and analyze geophysical and remote sensing data, aiming to enhance the geological mapping and detection of these bodies. The research integrated aerogeophysical data, including magnetometry and radiometry, as well as satellite data, in order to develop a robust geospatial dataset. The model was trained using a significant fraction of the dataset to provide a predictive map of geological occurrences. The obtained results demonstrated the high effectiveness of the model, with significant accuracy in discriminating the geological bodies of interest, which were validated by comparisons with field data and provided new insights on the distribution and characteristics of mafic-ultramafic intrusive bodies in the studied area. This study highlights the potential of using Machine Learning techniques in geology, particularly as a supporting tool for mineral prospecting, as well as providing more accurate and detailed geological maps.
Caracterização dos perfis de solo derivado da fácies anortosito da suíte Córrego das Campinas, associado à ocorrência de caulim, na região de Porangatu, Trombas e Santa Tereza de Goiás, Goiás
(Universidade Federal de Goiás, 2024-08-03) Maia, Débora Santos; Lima, Hugo Figueiredo de; Vieira, João Emerson Vasconcelos Leite; Reis, Mateus Andrade; Reis, Mateus Andrade; Canile, Fernanda Maciel; Arab, Paola Bruno
Considering the countless applications of clay minerals in the industry in its most diverse ramifications, the present work sought to characterize the soil profiles in the triple border of the municipalities of Trombas, Porangatu and Santa Tereza de Goiás, in the State of Goiás. In order to characterize the type of existing material, which uses and how it occurs throughout the entire study area. To this end, it was necessary to map the occurrences of rock and soil, analyze the physical, chemical and mineralogical properties of the soils and its horizons. Then it was carried out photo interpretation work looking for clear exposures of soils (clearances) and rock exposures. During the field activity, systematic sampling of variations in soil intervals and soil types was carried out, in addition to rock sampling. Sampling was done in the form of channel and spot sampling. Subsequently, geochemical analysis and geotechnical tests of the material were carried out in the laboratory. Therefore, it was verified that the existence of kaolinite, the main constituent of kaolin. The kaolin in the locality is primary, resulting from the alteration of the source rock (anorthosite) and is mainly associated with the B horizon of the soil. It is commonly noted that a superficial laterite crust, associated with alluvial deposits, contains concentrations of iron and titanium oxides in the kaolin, which interfere with the color of the material, making it possible to identify horizons of different colors such as red, yellow and white. It can be concluded that the soil profile in the study area is mostly composed of clay minerals, laterite crust and alluvial deposits. The color of the kaolin horizons is mainly due to the iron present in the laterite crust and minerals present in the anorthosite. It is necessary to process the material to remove the iron for applications in industry in general.
Mapeamento geológico 1:20.000 da Região Norte do depósito de cobre do município de Bom Jardim de Goiás - GO
(Universidade Federal de Goiás, 2024-11-29) Oliveira, Bruna Edriane Ramos de; Temporim, Filipe Altoé; Arab, Paola Bruno; Arab, Paola Bruno; Cavalcanti, Débora Ezequiel; Silva, Felipe de Lima da
The Bom Jardim de Goiás (BJG) region is part of the geological context of the Arenópolis Magmatic Arc, located in the far west of Goiás. It became the object of research in the 1970s, after the Geological Survey of Brazil (CPRM) identified radiometric anomalies on the edge of the Serra Negra Granite, which led to the development of extensive research projects. Despite this, the geological complexity of the region and the typology of the deposit are still not fully understood. The Bom Jardim de Goiás Metavolcanosedimentary Sequence features a diversity of volcanic rocks, ranging from metabasalts and metandesites to rhyolites, while the sedimentary portion includes metaconglomerates, phyllites and quartzites. The intermediate tuffs contain a small deposit of copper sulphides, initially associated with volcano-exhalative processes. The general objective of the work was to carry out detailed geological mapping of the northern region of the Bom Jardim de Goiás copper deposit, with the aim of improving understanding of the deposit model by integrating data from aerial images, geophysics, field studies and laboratory analyses. Specifically, the aim was to draw up a 1:20,000 scale geological map with geological profiles, correlate maps of magnetometric and gammaspectrometric domains and homologous zones, carry out detailed petrographic descriptions and reinterpret the structural geology of the area. The study covered an area of 24 km², with semidetailed geological mapping integrated with the interpretation of aerogeophysical data, photointerpreted satellite images and petrographic descriptions. Based on this data, a reinterpretation of the structural geology was proposed and, based on historical information, comparisons were made with the geological model of the deposit. In the pre-field phase, a bibliographic survey and compilation of historical data were carried out. During the field phase, geological mapping was carried out, hand samples were taken and structural data was obtained. In the post-field phase, the geological map and data were prepared in a GIS environment, petrographic description, structural interpretation with stereograms and rosette diagrams, and the information was consolidated in a report. The work involved geological-structural mapping of an area made up of basic and metavolcanosedimentary rocks from the Paleoproterozoic, with the aim of detailing their lithological and structural characteristics. During the study, it was possible to individualize the Metabasalt Lithofacies in the Córrego da Furna Formation, based on magnetometric responses, in addition to identifying new, previously unknown occurrences of sulphides. This data made it possible to propose a different deposit model from the existing ones, contributing to understanding the geological evolution of the area. The analysis also indicated the possible continuity, to the north, of the copper deposit previously identified by CPRM, broadening the region's exploration prospects. In structural geology, four structural domains were defined and at least three phases of deformation recorded in the lithologies were recognized. Domain 1, associated with the Cuiabá Group rocks, has a N-S structural trend and isoclinal folds related to the D1 deformation. Domain 2 covers the Morro do Urubu, Aldeinho and Morro Selado Formations of the BJG Sequence, with a N-S trend and dips to the E and W. Domain 3, associated with the Córrego da Furna and Córrego da Aldeia Formations, where the copper deposit to the south is located, showed the main S1 foliation subdivided into two pole patterns: one in the NE-SE quadrants and the other in the NW-SW quadrants. This garland pattern suggests a second phase of deformation and was the only one to differ from the bibliography. Finally, Domain 4, related to the Serra Negra Granite Unit, showed structures oriented predominantly to the east. These results highlight the tectonic complexity of the area and provide new information on its structural evolution.
Mapeamento geológico 1:5.000 e caracterização litogeoquímica para remineralizadores na região de Nazário-GO
(Universidade Federal de Goiás, 2024-07-30) Silva, Guilherme Fellype Xavier; Temporim, Filipe Altoé; Nascimento, Estela Leal Chagas do; Nascimento, Estela Leal Chagas do; Reis, Mateus Andrade; Martins, Éder de Souza
The intensive use of highly soluble chemical fertilizers (NPK) causes significant environmental impacts, proving the need to seek new alternatives to nourish the soil in less aggressive ways to the ecosystem. The use of rock dust to replenish nutrients to the substrate, known as rock dusting, is a technique that has stood out in recent years as a sustainable alternative to achieve this purpose. It can also be an option for properly disposing of mining waste. Normative Instruction No. 5 of March 10, 2016, from the Ministry of Agriculture, Livestock, and Supply (MAPA) stipulates that rocks efficient in replenishing nutrients to the substrate must meet certain criteria established by the agency. In recent years, the state of Goiás has become extremely relevant in the production of remineralizers. Keeping this in mind, DECAL – Derivados de Calcários Ltda contracted the services of Vila Rica Consultoria Mineral e Ambiental Ltda to conduct mineral research in the region of Nazário-GO, aiming to evaluate the potential of the region for the creation of a remineralizer product. The work includes field mapping, optical microscopy, chemical analyses using ICP-MS/OES (Inductively Coupled Plasma Mass Spectrometry), XRF (X-Ray Fluorescence), and SEM-EDS (Scanning Electron Microscopy with Energy Dispersive Spectroscopy) to perform quantitative and qualitative analysis of the lithologies of interest and studies of potentially toxic elements. As a complement to the field mapping, a geophysical survey of magnetic susceptibility was carried out to delineate and obtain more information about the geology of the work area. Based on the chemical analyses of the selected lithotypes, theoretical simulations were conducted to create a remineralizer compound composed of a blend of rock dust from various lithologies.
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 Macedo
The 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.
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 Ezequiel
The 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.
Mapeamento geológico, gravimetria e trama magnética do corpo intrusivo Córrego Seco, Anicuns-GO
(Universidade Federal de Goiás, 2024-08-02) Costa, Gustavo de Souza; Temporim, Filipe Altoé; Temporim, Filipe Altoé; Souza Junior, Gelson Ferreira de; Rodrigues, Sérgio Wilians de Oliveira
The Corrego Seco (CS) pluton is situated in the Arenópolis Magmatic Arc, located in the southern portion of the Brasília Belt (FB). It is a semi-circular intrusive body (30 km²) that intrudes rocks of the Anicuns-Itaberaí Metavolcanosedimentary Sequence and the Tonian-aged Sanclerlândia metagranite. The pluton exhibits inverse concentric zoning with a mafic core (gabbro/noritic) grading to quartz-dioritic edges with medium to coarse textural grain size variation. Additionally, studies conducted in the region using isotopic data and geological mapping indicate that the CS (Ediacaran) has a late emplacement and may crystallize from more evolved magmas derived from the final tectonic collision event of the Brasília orogen. Geological mapping, gravimetry, and anisotropy of magnetic susceptibility (AMS) data were combined to determine the emplacement mechanisms of the CS and its chronology in relation to the collision structure of the Brasília Belt. The gravimetric survey resulted in 72 stations using a Scintrex CG-5 Autograv terrestrial gravimeter. For the AMS, 28 sites were measured throughout the body. Magnetic susceptibility is quite variable (average of 4.72x10-² SI) and thermomagnetic curves indicate that magnetite is the main carrier of anisotropy. It has a high degree of anisotropy ranging from 1.012 to 1.502. The average shape parameter of anisotropy, defined as the ratio between the major and minor axes of the AMS ellipsoid, varies, with oblate ellipsoids being predominantly more abundant than prolate ones. Magnetic foliation and lineation data present concentric patterns of magnetic fabrics that cut across the regional N-S trending foliation. Hysteresis loop measurements indicate that the magnetic contribution comes from magnetite, i.e., crystals larger than 1 μm, and its susceptibility anisotropy is controlled by the external shape of the grains. The gravimetric data obtained from the field survey reflect the inversely zoned distributions, grading from the edges to the core. The data suggest that the emplacement was controlled by magma buoyancy forces, free from tectonic stresses. Therefore, the data indicate that the pluton is post-collisional, configuring an intrusion associated with the extensional phase of the Brasília Belt.
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 Araújo
The 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.
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 Victor
The 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.
Química mineral e caracterização tecnológica de milonitos da região de Araguaçu-TO para aplicação no setor de rochas ornamentais
(Universidade Federal de Goiás, 2024-07-30) Souza, Elifas Guimarães; Reis, Mateus Andrade; Nogueira Neto, José de Araújo; Nogueira Neto, José de Araújo; Silva, Francisco Diones Oliveira; Cavalcanti, Débora Ezequiel
The study in question deals with the technological characterization and mineral chemistry of a mylonite located in the municipality of Araguaçu, situated in the Western mesoregion, southern region of the State of Tocantins, and the Rio Formoso microregion, bordering the State of Goiás. Geologically, this area is part of the north-central portion of the Tocantins structural province, at the still poorly defined boundary of the Brasília and Araguaia orogens. The main objective of the work was to carry out lithostructural mapping of the area, characterize the mineral chemistry, and assess the potential of mylonitic rocks occurring in the Araguaçu-TO region for use as ornamental stone. The aim was to evaluate their technological parameters, in accordance with the standards of ABNT, ASTM, and Frazão and Farjallat, to indicate this material for applications in the ornamental stone market. In recent years, there has been a significant increase in demand for ornamental stones, driven by the growth of the construction industry and tourism, which has put great pressure on deposits and increased the need for sustainable management of natural resources and the search for alternative production methods. In the study area, four lithotypes were mapped from the base to the top: I - Baixo Araguaia Group, specifically the Xambioá Formation; II - Água Bonita Formation; III - Mylonite, the subject of this study; and IV - Detrital-lateritic covers, showing a predominantly NE-SW structure. The study provides a geological base at a scale of 1:30,000. The results suggest that the mylonite is suitable for various applications in the construction industry, such as floor and wall coverings, countertops and sinks, facades and exterior cladding, staircases, among others.

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