http://repositorio.ufc.br/handle/riufc/22264 2026-04-07T13:19:15Z http://repositorio.ufc.br/handle/riufc/85399 Título: Ocorrência de elementos terras raras nos rególitos do Batólito Pereiro e Faixa-Orós Jaguaribe Autor(es): Souza, Calebe Garcez Nascimento Mendonça de Abstract: This study aimed to investigate the potential occurrence of rare earth elements (REEs) in different geological units located in the southeastern portion of the state of Ceará and in the westernmost areas of the states of Rio Grande do Norte and Paraíba, Brazil. The research was based on prior planning involving cartographic analysis and interpretation of thorium (Th) geophysical anomalies, followed by fieldwork carried out in a single campaign with systematic sampling of rocks, altered rocks, and autochthonous soils. The samples were analyzed using Scanning Electron Microscopy coupled with Energy Dispersive Spectrometry (SEM–EDS), with emphasis on the granulometric fraction smaller than 0.125 mm. The results indicate that the augen gneisses of the Serra do Deserto Suite show the most significant REE enrichments, with the detection of yttrium (Y), lanthanum (La), neodymium (Nd), cerium (Ce), and hafnium (Hf), mainly associated with accessory minerals resistant to weathering. No significant REE anomalies were identified in the São Miguel Suite, Dr. Severiano Suite, or the Poço Dantas Pluton; however, localized enrichments of barium and tin were detected, the latter associated with hydrothermal environments. It is concluded that the integration of geophysical data, multiscale sampling, and SEM–EDS analyses proved effective in identifying areas favorable to REE concentration, highlighting the Serra do Deserto Suite as the unit with the greatest potential. Tipo: TCC 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/83878 Título: Interpretação sísmica avançada de canais em águas profundas usando análise multiatributo e aprendizado de máquina: estudo na Bacia do Ceará, Margem Equatorial Brasileira Autor(es): Morais, Miguel Rodrigo Cavalcante de Abstract: The Brazilian Equatorial Margin (BEM) has garnered scientific interest due to the discovery of oil and gas reserves in its African counterpart and the offshore basins of Guyana, Suriname, and French Guiana. Foz do Amazonas, Potiguar, and Ceará basins stand out as promising targets due to their geological similarities, including the presence of reservoirs formed by turbidite. The Ceará Basin, part of the BEM, is subdivided into the Mundaú, Icaraí, Acaraú, and Piauí-Camocim sub-basins. This study aims to investigate the evolution of a channel system formed between the Albian and Maastrichtian, during the drift phase of the Icaraí sub-basin, a region less explored compared to the Mundaú sub-basin. A seismic volume of 2700 km², provided by TGS and processed using Full Waveform Inversion (FWI), was utilized, consisting of depthmigrated data with 4240 inlines and 2922 crosslines, spaced 12.5 meters apart. The research employs machine learning methods to interpret the evolution of these channels and infer possible infilling lithologies, overcoming the scarcity of well data in the area. The method used in this study was based on multi-attribute analysis and Self-Organizing Maps (SOM) to indirectly interpret the lithologies within the channel. Two channels were identified, both showing stratigraphic control with variations in internal patterns reflecting changes in depositional or erosional processes. The width of the channels in the proximal zone is approximately 2 km, increasing to 4 km in the distal zone. To better describe this evolution, a hierarchical classification model was applied, segmenting the study into proximal, intermediate, and distal areas. The results show that the evolution of the channels occurs distinctly as they move away from the continental margin. Initially, both channels exhibit highly confined and erosive characteristics, indicating high-energy conditions. As they progress into more distal areas, the channels become wider, potentially forming submarine fans. This widening promotes the development of significant turbidite elements (levees, overbanks), with sediment dispersal to the east, accompanied by the deposition of materials transported by the two channels. Additionally, large mass transport complexes were identified in the system, associated with variations in channel energy levels. These complexes not only influence depositional dynamics but also induce directional changes in the channels throughout their evolution. The Icaraí subbasin, still largely underexplored and with no deep-water well records, showed significant potential for increased exploratory studies through the application of machine learning methods combined with high-resolution seismic data. This approach enabled advances inthe geomorphological and stratigraphic understanding of the region, contributing to a more comprehensive understanding of the dynamics and evolution of the Late Cretaceous interval of the basin. Tipo: TCC 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/82600 Título: Uso do sensoriamento remoto para identificação de ferro e carbonato em uma região do Domínio Médio Coreaú Autor(es): Rodrigues, Antonio Lucas Freitas; Oliveira, Maria Eugênia de Almeida Abstract: This study evaluates the potential of remote sensing for the identification of iron deposits and carbonate rocks in the Médio Coreaú Domain, Ceará, using multispectral images from the Sentinel-2 satellite, processed with QGIS 3.34 software in a Geographic Information System (GIS) environment. Digital image processing techniques were applied, including RGB composition, band ratio, normalized difference vegetation index (NDVI), principal component analysis (PCA), and supervised classification. The theoretical framework addressed concepts of remote sensing, electromagnetic radiation, and spectroradiometry, essential for analyzing the spectral reflectance behavior of materials. The spectral response of iron oxides (Fe³⁺ and Fe²⁺) and carbonates, characterized by absorption features in specific regions of the electromagnetic spectrum (VNIR and SWIR), was analyzed to differentiate mineralogical compositions. The results indicated that the Random Forest algorithm provided the best performance in distinguishing mineral classes. The study demonstrated that the integration of orbital data with geoprocessing techniques offers an efficient, accurate, and cost-effective approach for mineral prospecting, contributing to the advancement of exploration practices in the mineral sector of Ceará. Tipo: TCC 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/79904 Título: Pesquisa bibliométrica sobre Paleontologia e Arqueologia em Unidades Espeleológicas Brasileiras Autor(es): Dutra, Daniela Teixeira; Pimenta, Welberth Pereira Abstract: The caves are known for preserving cave paintings, lithic artifacts, ceramics and even remains of prehistoric man, as well as fossil material that is carried into its interior by groundwater and floods over thousands of years, protecting them from the weathering and leading to fossilization. Due to the lack of mapping of archaeo-speleo-paleontological sites in the country, the present study was proposed to examine karst units with archaeo-paleontological records, map their locations and generate data on paleo-archaeological discoveries found in natural cavities nationwide. Initially, relevant literature was searched defining certain keywords. The keywords were "Caverna", "Cavidade Natural", "Paleontologia", "Fóssil" and "Arqueologia". In the subsequent phase, targeted research platforms, sources and repositories were used to collect geospatial data and metadata. Subsequently, the bibliographic results were filtered and selected for the database, considering the timeframe from 2010 to 2023. Afterwards, the intellectual structure was aggregated and the state of the art was tabulated. In the final step, the data were processed to create maps and graphs for interpretation. The results demonstrate that the words “Caverna; Paleontologia” had the highest result with almost 50% of the cases. More than half of Brazilian natural cavities with fossil and/or archaeological findings are found in carbonate lithology, mainly limestone (53.2%). Sandstone rocks (11.3%), BIFs (3.2%) and granites (3.2%) also exhibit natural cavities with relevant records. The caves of the Bambuí Group presented the greatest cases of archaeo-paleontological records, followed by the Corumbá Group, Salitre Formation and Furnas Formation. Most fossils discovered from 2010 to 2023 indicate Quaternary ages. Much of the research in the last decade is concentrated in the Annals of the Brazilian Congress of Speleology and 2017 proved to be the year with the most publications. Bahia gave prominence to paleontological research in caves, resulting in the publication of 19 works in 21 cities, on the other hand, Pará was more productive for archaeological studies in caves. Campo Formoso (BA), Lagoa Santa (MG) and Rurópolis (PA) stand out for having the highest number of works published among Brazilian municipalities. Regarding taxonomy, most fossils discovered are of mammals, followed by hominids and their achievements. The Midwest and North regions lacked studies on archaeopaleontology in natural cavities in recent years, as shown by the mapped points. Finally, it was concluded that significant amounts of excavated publications lacked crucial geological data from the field, it is suggested that this information be observed in future work. Furthermore, the probability of occurrence of caves in granitic lithology seems to be greater than those currently proposed, more studies are needed for this hypothesis. In addition, the results point to possible new caves and suggest updating existing geospatial databases, including more indexing data sources for broader results and building a unified online environment for public access for archiving and sharing data of scientific research. Tipo: TCC 2025-01-01T00:00:00Z