https://repositorio.ufba.br/handle/ri/1226 2026-05-05T02:53:58Z https://repositorio.ufba.br/handle/ri/44424 Título: Quantificação e inventariação dos elementos da geodiversidade na Praia da Paciência: potencial pra avaliação de um geossítio Autor(es): Silva, Eula Andrade Nascimento da Primeiro Orientador: Barbosa, Natali da Silva Abstract: The concepts of Geoconservation, geodiversity, and geotourism are widely interconnected. They have contributed to understanding nature as a system—the Earth System—which is complex and dynamic. Based on this understanding, the geoscience community has started to work on conserving nature, developing projects for studying, promoting awareness, and protecting the abiotic environment. Population growth and socio-economic development lead to a gradual increase in the exploitation of natural resources, which often reach their maximum limits, consequently multiplying environmental risks. In this context, large cities like Salvador—home to important areas of geological risk—face issues related to unplanned occupation, especially in rugged terrain areas where rainy seasons can trigger mass movements and pose risks to local populations. The lack of dissemination and understanding of geosciences by government agencies and the public—particularly at the national level—contributes to a general lack of awareness about the processes and the time it takes for nature to form geological heritage. Advancing geological knowledge within society gradually benefits nature, aiding in its preservation for future generations. Therefore, geoconservation is a vital practice for environmental preservation, promoting sustainability, and ensuring that our natural heritage is protected for the future To promote geoscience education, an inventory of the geological heritage was carried out at Praia da Paciência, located in the Rio Vermelho neighborhood of Salvador, Bahia. This effort aims to optimize the management of geological resources, the environment, and natural landscapes,the variety of geological elements and processes that make up the abiotic part of the Earth, including rocks, minerals, fossils, soils, landforms, and the processes that originate and modify them over time, as well as to help preserve the geological memory of important sites—especially those considered fragile and vulnerable to natural or human threats. To develop appropriate geoconservation strategies tailored to the local reality, a quantitative assessment method was used, integrated into the GEOSSIT platform of the Geological Service of Brazil. This assessment evaluated the scientific value, degradation risk, educational and touristic potential, and protection priorities. In this project, a survey was conducted of the geological features present at Praia da Paciência. The study identified igneous, metamorphic, and sedimentary rocks, along with their macroscopic, structural, and geomorphological aspects. The region stands out for its high scientific potential, with significant educational, touristic, and scenic attributes. The beach features rocky outcrops containing the rare mineral safirin, formed under extreme temperature and pressure conditions, alongside other minerals typical of granulite facies. These outcrops provide valuable insights into deep crustal processes, making the site a focal point for scientific studies. Beyond its exceptional geological history and lithological diversity, the area also holds cultural and historical significance. Promoting geosciences to society through formal and informal educational programs can in the future implementation of a geosite (a location with one or more geodiversity elements, well-defined geographically, that have scientific value) in the region. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Dissertação 2025-10-20T00:00:00Z https://repositorio.ufba.br/handle/ri/44105 Título: Inventário e avaliação quali-quantitativa de sítios de geodiversidade na Bacia do Recôncavo no Nordeste do Brasil. Autor(es): Seabra, Gleide Mendes Primeiro Orientador: Barbosa, Natanael da Silva Abstract: The Recôncavo Basin, located in the eastern portion of the state of Bahia, Northeast Region of Brazil, is mostly covered by Mesozoic sediments, derived from taphrogenesis that began slightly before this era, still in the Paleozoic, during the fragmentation process of the supercontinent Gondwana. The chronology of the basin's formation is defined by three stages of rift evolution, with a complete and representative sedimentary sequence of all phases during the Permian (~298 and 252 Ma). The Permian record in northeastern Brazil begins with lithostratigraphic successions, with excellent seasonal coverage and diverse geological content. The scientific importance of the representative outcrops of the Recôncavo Basin is already being explored, through field trips, by some federal educational institutions. The area encompasses not only geological content but also landscapes with river formations, lakes, deltas, estuaries, valleys, floodplains, waterfalls, and all associated landscapes resulting from large-scale geological/fluvial processes. In addition to the significant and relevant geological history, scenic and touristic content of the Recôncavo basin, the production of significant quantities of hydrocarbons has been conditioned in this basin. The spatio-temporal variation of this lithostratigraphic succession presents scientific and educational potential, as well as economic importance, and has potential for the classification and evaluation of geological materials indicative of environmental protection. These factors justify the need for a geoconservation study, the objective of this work, which involves the inventory, quantification, and quantitative evaluation of geosites in the region. Using the methodology of the Geosites and Geodiversity Sites Registration and Quantification System - GEOSSIT (Mineral Resources Research Company - CPRM/Geological Survey of Brazil - SGB), six geosites were selected and analyzed based on their scientific, educational, and touristic values. The results indicate that the sites have high scientific value and potential for geoeducation, although they present a high risk of degradation due to their proximity to highways. This highlights that valuing this geoheritage is essential for geoconservation strategies and for regional sustainable development through geotourism. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Dissertação 2025-11-10T00:00:00Z https://repositorio.ufba.br/handle/ri/44046 Título: Caracterização mineral e implicações geometalúrgicas do depósito de níquel laterítico São João do Piauí. Autor(es): Victorino, Ernesto Domingos Primeiro Orientador: Gomes, Sylvio Dutra Abstract: The nickel laterite deposit at São João do Piauí (Piauí Nickel deposit) is located in northeastern Brazil, and presents a standard oxide laterite type profile. At deposit scale, the lateritic profile (with 80 m in the studied drillholes) is composed by a silicified ferruginous laterite as the most volumetrically representative unit. In lithogeochemical analyses the general context of the lateritic horizon Fe and Si show an inverse proportional relation. Subordinate layers (~3 m) of green saprolite, enriched in MgO, Ni and REE (~7 %, 0.6 %, ~200 ppm respectively) occur intercalated in the lateritic horizons. Rietveld refinement in X-ray diffraction data determined quartz, magnetite, hematite and goethite as the most common phases in samples from the oxide horizon. Rietveld quantitative results show that in samples from the ferruginous laterite unit, goethite is the Fe mineral most enriched in trace elements, including Ni, Cu, Co, REE. Refinement of stoichiometry in magnetite-maghemite solid solution from de ferruginous laterite shows that most of the magnetite identified in the qualitative XRD analyses is in fact the isomorphic maghemite. In this context, the Rietveld analyses proved to be a powerful tool in the mineral characterization of magnetite enriched. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Dissertação 2025-12-16T00:00:00Z https://repositorio.ufba.br/handle/ri/43650 Título: Estimativa probabilística da recarga e sua sensibilidade à mudanças nos regimes de precipitação para o Aquífero Urucuia, Brasil. Autor(es): Souza, Ellen Cristina Oliveira Primeiro Orientador: Leal, Luiz Rogério Bastos Abstract: Groundwater recharge represents a key component of the aquifer water balance, directly influencing water resource availability, especially in regions where these resources are under intense pressure. The Urucuia Aquifer System, located in western Bahia, plays a strategic role in supporting irrigated agriculture, urban water supply, and the maintenance of ecosystems. However, the continuous expansion of irrigated agriculture, combined with land use changes and climate change, has intensified groundwater extraction, compromising aquifer recharge. In this context, this dissertation aims to estimate the recharge of the Urucuia Aquifer System in an area located within the Corrente River basin, using daily hydrometeorological data from five stations. Different soil water balance approaches were applied, including deterministic, probabilistic, and stochastic methods, over an extended observation period. The soil water balance modeling was based on the models developed by Porporato et al. (2004) and Feng et al. (2015), allowing the evaluation of climatic variables such as precipitation, evapotranspiration, and soil moisture on recharge formation. The results indicated that recharge is concentrated during the rainy season and virtually absent during the dry period. Additionally, seasonal precipitation patterns, characterized by variations in daily rainfall probability and mean precipitation intensity, significantly influence recharge formation, with higher frequency and intensity of rainfall during summer. A simple and robust empirical relationship was obtained, expressed as R ≈ P – 2, indicating that annual recharge can be estimated from the precipitation surplus above a constant average evapotranspiration threshold of approximately 2 mm/day. This approach proved more suitable than fixed-percentage precipitation methods, as it better reflects the local hydrological dynamics. Simulations show that reductions in precipitation may decrease recharge by over 30%, while soil moisture and evapotranspiration remain stable due to the high soil water storage capacity and deep rooting systems. The applied methodology proved effective in simulating recharge and supporting the management of the Urucuia Aquifer, emphasizing the need for sustainable use in the face of agricultural expansion and climate change. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Dissertação 2025-08-15T00:00:00Z