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dc.contributor.authorSouza, Sthefany Pessoa de-
dc.date.accessioned2026-10-23T14:26:10Z-
dc.date.available2026-10-23T14:26:10Z-
dc.date.issued2026-07-26-
dc.identifier.citationSOUZA, Sthefany Pessoa de. Vulcanologia física e química da formação paranapanema em Pitanga (PR) na Bacia do Paraná. 2026. 97 f. Dissertação (Mestrado em Geociências) - Instituto de Geociências, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2026.pt_BR
dc.identifier.urihttp://rima.ufrrj.br/jspui/handle/20.500.14407/26761-
dc.description.abstractEste estudo apresenta uma investigação detalhada dos basaltos de alto-Ti da Formação Paranapanema, situada no município de Pitanga (PR), unidade que representa o estágio final do vulcanismo da Província Magmática do Paraná (PMP) durante o Cretáceo Inferior. O trabalho apresenta uma caracterização integrada da litoestratigrafia, petrografia e litogeoquímica de dez fluxos de lava das morfologias simple e rubbly pahoehoe. O objetivo principal da dissertação consiste em compreender os mecanismos de colocação e a extensão lateral dessas lavas, além de interpretar as condições paleoambientais vigentes durante o emplacement das lavas e abordar os aspectos da paleotopografia local. Os resultados demonstram que ambas as morfologias possuem teores de SiO2 semelhantes, indicando que a polimerização da sílica não foi o fator primário no controle da tensão interna das lavas. Contudo, os fluxos rubbly mostram-se mais magnesianos, cálcicos e titaníferos, apresentando maior depleção em elementos-traço incompatíveis em comparação às lavas simple pahoehoe. Tais discrepâncias químicas em amostras com teores de MgO similares indicam que as duas morfologias não são cogenéticas em um processo de diferenciação em sistema fechado. Sugere-se que os magmas tenham origem em uma mesma câmara que sofreu recargas periódicas de magma basáltico, hipótese sustentada pelo enriquecimento cíclico de MgO na estratigrafia e por texturas de sistema aberto, como zoneamento composicional e feições de peneiramento (sieve texture) em macrocristais de plagioclásio. Petrograficamente, ambas as morfologias exibem texturas de resfriamento rápido, incluindo matriz hialopilítica e cristais com cauda de andorinha. A litogeoquímica provou ser uma ferramenta eficaz para a correlação regional, permitindo estabelecer a extensão lateral mínima de dois fluxos rubbly em 14 e 20 quilômetros, respectivamente. Essa conclusão baseia-se na observação de que a variação química entre os núcleos dos fluxos em diferentes regiões é inferior à margem de erro das técnicas analíticas relacionadas à aquisição de dados litogeoquímicos. Essa abordagem permitiu inferir uma paleotopografia com inclinação suave, inferior a 0,34o. Adicionalmente, o predomínio das frações silte e argila e a pobre seleção da matriz sedimentar dos topos brechados das lavas rubbly, bem como a presença de peperitos, indicam uma transição paleoclimática de condições áridas, reportadas em trabalhos prévios para a base do Grupo Serra Geral, para um ambiente com maior disponibilidade hídrica no topo deste. Este trabalho contribui para o entendimento dos mecanismos de colocação de derrames basálticos continentais e fornece informações para a reconstrução paleoambiental, consolidando uma base litoestratigráfica para a Formação Paranapanema na área de estudo.pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectVulcanologia físicapt_BR
dc.subjectFormação Paranapanemapt_BR
dc.subjectProvíncia Magmática do Paranápt_BR
dc.subjectPhysical volcanologypt_BR
dc.subjectParanapanema Formationpt_BR
dc.subjectParaná Magmatic Provincept_BR
dc.titleVulcanologia física e química da formação paranapanema em Pitanga (PR) na Bacia do Paranápt_BR
dc.title.alternativePhysical and chemical volcanology of the paranapanema formation in Pitanga (PR) in the Paraná Basinen
dc.typeDissertaçãopt_BR
dc.description.abstractOtherThis study presents a detailed investigation of the high-Ti basalts of the Paranapanema Formation, located in the Pitanga city (PR). This formation represents the final stage of volcanism in the Paraná Magmatic Province (PMP) during the Lower Cretaceous. This work presents an integrated characterization of the lithostratigraphy, petrography, and lithogeochemistry of ten lava flows of simple and rubbly pahoehoe morphologies. The main objective of the dissertation is to understand the mechanisms of emplacement and the lateral extension of these lavas, as well as to interpret the paleoenvironmental conditions during deposition and the local paleotopography. The results show that both morphologies have similar SiO2 contents, indicating that silica polymerization was not the primary factor controlling the internal stress of the lavas. However, the rubbly flows are more magnesian, calcic, and titaniferous, showing greater depletion in incompatible trace elements compared to simple pahoehoe lavas. Such chemical discrepancies in samples with similar MgO contents indicate that the two morphologies are not cogenetic in a closed-system differentiation process. It is suggested that the magmas originate from the same chamber with periodic recharging of basaltic magma, a hypothesis supported by the cyclic enrichment of MgO in the stratigraphy and by open-system textures, such as compositional zoning and sieve textures in plagioclase macrocrystals. Petrographically, both morphologies exhibit undercooling textures, including hyalopilitic matrix and swallowtail crystals. Lithogeochemistry proved to be an effective tool for regional correlation, allow establish the minimum lateral extent of two rubbly flows at 14 and 20 kilometers, respectively. This conclusion is based on the observation that the chemical variation between the cores of the flows in different regions is less than the margin of error of the lithogeochemistry analytical techniques. This approach allow to infer a paleotopography with a gentle slope of less than 0.34o. Additionally, the presence of silt and clay and the poorly- sorted grains in sedimentary matrix of brecciated top of rubbly lavas, as well as the presence of peperites, indicate a paleoclimatic transition from arid conditions, at the base of the Serra Geral Group, to an environment with greater water availability at the uppermost part of this Group. This work contributes to understanding the emplacement mechanisms of continental flood basalts, and provides information for the paleoenvironmental reconstruction, consolidating a lithostratigraphy of the Paranapanema Formation in the study area.en
dc.contributor.advisor1Silva, Júlio César Lopes da-
dc.contributor.advisor1IDhttps://orcid.org/0000-0001-6230-0058pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/4978515572360716pt_BR
dc.contributor.advisor-co1Miranda, Alan Wanderley Albuquerque-
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/3598656829269121pt_BR
dc.contributor.referee1Silva, Júlio César Lopes da-
dc.contributor.referee1IDhttps://orcid.org/0000-0001-6230-0058pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/4978515572360716pt_BR
dc.contributor.referee2Miranda, Alan Wanderley Albuquerque-
dc.contributor.referee2Latteshttp://lattes.cnpq.br/3598656829269121pt_BR
dc.contributor.referee3Queiroz, Bárbara Santos-
dc.contributor.referee3Latteshttp://lattes.cnpq.br/3792245977768613pt_BR
dc.contributor.referee4Valente, Sergio de Castro-
dc.contributor.referee4IDhttps://orcid.org/0000-0002-7467-672Xpt_BR
dc.contributor.referee4Latteshttp://lattes.cnpq.br/7049948512331299pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/7777411915039209pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Geociênciaspt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-graduação em Modelagem e Evolução Geológicapt_BR
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dc.subject.cnpqGeociênciaspt_BR
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