https://repositorio.ufu.br/handle/123456789/20867 2026-08-25T19:40:06Z 2026-08-25T19:40:06Z https://repositorio.ufu.br/handle/123456789/49738 2026-08-22T06:26:52Z 2026-07-28T00:00:00Z

Title: Caracterização estrutural da zona de cisalhamento Douradinho na região entre Coromandel/MG e Abadia dos Dourados/MG Abstract: This Bachelor's Thesis aimed to characterize the Douradinho Shear Zone, a regional deformation zone with a preferential NW–SE trend, located between the municipalities of Coromandel and Abadia dos Dourados, Minas Gerais, Brazil. The structure affects rocks of the Monte Carmelo Complex, Abadia dos Dourados Complex, and Araxá Group, constituting a structurally significant feature within the southern portion of the Brasília Belt. A multiscale approach was employed based on the integration of morphostructural, airborne geophysical, field geological, microstructural, and three-dimensional geological modeling data. The analysis of Digital Elevation Models (DEM), combined with the interpretation of gamma-ray spectrometric and magnetic data, revealed a strong NW–SE structural control over the relief and drainage network, evidenced by rectilinear channel segments and fluvial deflection anomalies. Geophysical products revealed radiometric and magnetic contrasts associated with the different geological units, indicating that the granitic bodies acted as relatively more competent domains during regional deformation, promoting strain partitioning along their margins. Three-dimensional geological modeling demonstrated the spatial continuity of these structures at depth and enabled the correlation between geophysical domains and surface observations. Petrographic and microstructural analyses identified intracrystalline deformation features and dynamic recrystallization in quartz, associated with the predominantly brittle behavior of feldspars, indicating deformation under low-grade greenschist facies metamorphic conditions. Furthermore, the observed mineral assemblage suggests that the structure acted as a conduit for the circulation of fluids. Although no diagnostic kinematic indicators were identified to unequivocally determine the sense of movement of the structure, the integration of the different datasets allowed the characterization of the spatial distribution of deformation and the role played by the Douradinho Shear Zone in the lithostructural arrangement of the local geological units. The results contribute to the understanding of the structural evolution of the southern portion of the Brasília Belt and provide a basis for future tectonic and geophysical investigations in the region.

2026-07-28T00:00:00Z https://repositorio.ufu.br/handle/123456789/49623 2026-08-19T06:22:35Z 2026-03-18T00:00:00Z

Title: Mapeamento geológico e petrografia do granito douradoquara, Douradoquara - MG Abstract: In the surroundings of the municipality of Douradoquara (MG), located in the Triângulo Mineiro region, Neoproterozoic metasedimentary and metamafic rocks of the Araxá Group occur, as well as granitoids associated with the Monte Carmelo Complex. These lithologies are inserted in the southern sector of the Brasília Fold Belt and are related to a syn-tectonic event responsible for the intrusion of granitoids along regional foliations and shear zones developed within the schists. The Douradoquara Granite is located west of the municipality of Douradoquara, Minas Gerais, and was previously mapped by CODEMIG (Catalão Sheet – SE.23-Y-A-I, 2017) at a 1:100,000 scale. The present study aimed to map this granitic body at a 1:30,000 scale, seeking a higher level of detail, as well as the individualization and characterization of its facies based on textural, compositional, and structural variations. The applied methodology was divided into three stages. The pre-field stage consisted of bibliographic review, satellite image analysis, interpretation and processing of aerogeophysical image data, and interpretation of structural lineaments, allowing the preliminary delimitation of zones with similar geomorphological and structural characteristics. The field stage involved geological mapping of the outcropping lithotypes, distinguished based on textural, mineralogical, and structural criteria, in addition to photographic documentation and sample collection. Finally, the post-field stage comprised macroscopic and microscopic analyses of the samples, enabling their classification and differentiation into facies, culminating in the elaboration of a new geological map with redefined limits of the granitic body. The results indicate that the area corresponding to the Douradoquara Granite unit is smaller than that presented in the regional 1:100,000-scale mapping by CODEMIG, with a greater predominance of metasedimentary and metamafic host rocks of the Araxá Group, mainly represented by garnet-bearing quartz–muscovite–biotite schist and amphibolites occurring as lenses with a NW–SE trend. The granitoids are foliated, with preferential orientation according to the regional NW–SE trend. The essential mineralogy consists of quartz, microcline, oligoclase, biotite, muscovite, and garnet, allowing the classification of the lithotypes as inequigranular monzogranites to granodiorites. Based on differences in color and mineralogical composition, the body was subdivided into two facies: inequigranular gray facies and inequigranular whitishgray facies, with their main distinction related to the presence of primary muscovite in the inequigranular whitish-gray facies. The presence of aluminous minerals, such as garnet and primary muscovite, indicates that the Douradoquara Granite resulted from crustal melting, characterizing it as a peraluminous S-type granite. The occurrence of quartz-feldspathic pockets within the foliation of garnet-bearing quartz–biotite–muscovite schist and the magmatic foliation with a regional NW–SE trend evidence its syn-tectonic emplacement, strongly controlled by the structural framework of the host rocks, reflecting the exploitation of these structures during intrusion, as well as the deformational processes active during the Neoproterozoic evolution of the Brasília Fold Belt

2026-03-18T00:00:00Z https://repositorio.ufu.br/handle/123456789/49436 2026-08-12T06:28:37Z 2026-03-18T00:00:00Z

Title: Mapeamento geológico, petrografia e geoquímica do granito Dourados associado ao Complexo Monte Carmelo, Douradoquara-MG

2026-03-18T00:00:00Z https://repositorio.ufu.br/handle/123456789/48364 2026-02-24T06:20:33Z 2025-09-19T00:00:00Z

Title: Integração de dados aerogeofísicos e geológicos aplicados na prospecção de potássio nas adjacências de Sacramento - MG Abstract: This study investigates potential sites for potassium prospecting in the Sacramento region of Minas Gerais, aiming to reduce Brazil's dependence on imports of this resource, which is crucial for agricultural fertilizers. The research began with a literature review and the establishment of clear objectives, followed by a description of the methodology, which highlights the use of Geographic Information Systems (GIS) for processing and integrating geophysical and geological data. Aerogeophysical and geological methods were employed to integrate gamma-spectrometric data (potassium channel) with field mapping, with the goal of identifying promising areas for potassium prospecting. The data were processed using Oasis Montaj software, which helped identify potential targets, particularly zones with high potassium concentrations known as verdetes. The results reveal that the study area exhibits geophysical anomalies that correlate with significant potassium concentrations, indicating possible exploration potential. Seven promising targets were delineated, with emphasis on Target G, where mineralization occurs at shallow depths with significant K₂O grades (between 5% and 18%). Field confirmation, including geological mapping and drilling, validated the method's effectiveness, with 17 out of 20 drill holes yielding positive results. It is concluded that the integration of geophysical and geological data optimizes mineral prospecting, reduces costs, and indicates the area is viable for the economic exploitation of potassium.

2025-09-19T00:00:00Z