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dc.contributor.authorSilva, Cynthia Vargas Castro da-
dc.date.accessioned2026-08-26T12:33:06Z-
dc.date.available2026-08-26T12:33:06Z-
dc.date.issued2026-01-21-
dc.identifier.citationSILVA, Cynthia Vargas Castro da. Magmatismo da sequência pré-sal na porção centro-sul da Bacia de Santos: processos petrogenéticos e geodinâmica do manto. 2026. 97 f. Dissertação (Mestrado em Modelagem e Evolução Geológica) - Instituto de Geociências, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2026.pt_BR
dc.identifier.urihttp://rima.ufrrj.br/jspui/handle/20.500.14407/26177-
dc.description.abstractEste estudo investiga o magmatismo máfico pré-albiano na sequência pré-sal da Bacia de Santos, associado ao rifteamento de Gondwana e à abertura do Atlântico Sul. A pesquisa integra dados petrográficos, estratigráficos e geoquímicos de duas seções ígneas perfuradas pelos poços 3-BRSA-1290-SPS e 3-BRSA-883-RJS. Devido à ausência de restrições isotópicas (Sr-Nd-Pb-Hf), todas as interpretações petrogenéticas derivam exclusivamente de elementos maiores e traços — uma limitação que exige que todas as inferências sobre a fonte mantélica permaneçam hipóteses testáveis. Os resultados indicam que os magmas de ambos os poços são predominantemente toleíticos, com exceção de uma amostra alcalina (4923) no poço 3-BRSA-883-RJS. A modelagem petrogenética, incorporando a análise de sensibilidade de parâmetros-chave (valores de Kd, proporções modais da fonte, taxas de assimilação), sugere fusão dentro do campo de estabilidade da espinélio em profundidades estimadas de 58-68 km (poço sul) e 44-51 km (poço central), com margens de incerteza de ±5 km e ±4 km, respectivamente. A distinção composicional entre os poços, separados por apenas 120 km, indica heterogeneidade mantélica em escala intra-bacia. O poço sul (3-BRSA-1290-SPS) apresenta padrões consistentes com fontes enriquecidas (afinidades do tipo E- MORB/OIB), enquanto o poço central (3-BRSA-883-RJS) exibe assinaturas compatíveis com fontes mais empobrecidas (afinidades de N-MORB a E-MORB). Essas interpretações requerem validação isotópica futura para a caracterização definitiva da fonte. Os processos de diferenciação operaram predominantemente por meio de cristalização fracionada em sistemas fechados ou sistemas com recarga limitada (RFC). A modelagem AFC sugere assimilação crustal restrita a amostras específicas, com baixas taxas de assimilação (r = 0,2) – uma inferência que carece de confirmação isotópica independente. A análise de sensibilidade confirma que a variação das taxas de assimilação entre 0,1 e 0,3 produz variações composicionais dentro de 10-20% dos valores observados, mas não consegue discriminar inequivocamente a assimilação da heterogeneidade da fonte. A diversidade composicional entre os poços reflete principalmente a fusão de domínios heterogêneos do manto em diferentes profundidades dentro do campo de estabilidade da espinélio. Do ponto de vista acadêmico, esses resultados corroboram quantitativamente o papel das heterogeneidades do manto e da segmentação da litosfera durante o rifteamento de Gondwana. De uma perspectiva exploratória, a caracterização petrogenética dos membros 'Parati' (Pós-Rift, fontes enriquecidas) e 'Tupi' (Rift, fontes empobrecidas) fornece critérios geoquímicos para o mapeamento de sistemas petrolíferos na província do Pré-Salpt_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.subjectMagmatismo Toleíticopt_BR
dc.subjectMagmatismo Pré-Albianopt_BR
dc.subjectBacia de Santospt_BR
dc.subjectPetrogênesept_BR
dc.subjectHeterogeneidade Mantélicapt_BR
dc.subjectTholeiitic Magmatismpt_BR
dc.subjectPre-Albian Magmatismpt_BR
dc.subjectSantos Basinpt_BR
dc.titleMagmatismo da sequência pré-sal na porção centro-sul da Bacia de Santos: processos petrogenéticos e geodinâmica do mantopt_BR
dc.title.alternativeMagmatism of the Pre-Salt sequence in the south-central portion of the Santos Basin: petrogenetic processes and mantle geodynamicsen
dc.typeDissertaçãopt_BR
dc.description.abstractOtherThis study investigates Pre-Albian mafic magmatism in the Santos Basin Pre-Salt sequence, associated with Gondwana rifting and South Atlantic opening. The research integrates petrographic, stratigraphic, and geochemical data from two igneous sections penetrated by wells 3-BRSA-1290-SPS and 3-BRSA-883-RJS. Due to the absence of isotopic (Sr-Nd-Pb-Hf) constraints, all petrogenetic interpretations derive exclusively from major and trace elements—a limitation requiring that all mantle source inferences remain testable hypotheses. Results indicate that magmas from both wells are predominantly tholeiitic, except for one alkaline sample (4923) in well 3-BRSA-883-RJS. Petrogenetic modelling, incorporating sensitivity analysis of key parameters (Kd values, source modal proportions, assimilation rates), suggests melting within the spinel stability field at estimated depths of 58-68 km (southern well) and 44-51 km (central well), with uncertainty margins of ±5 km and ±4 km respectively. The compositional distinction between wells, only 120 km apart, indicates mantle heterogeneity at an intra-basin scale. The southern well (3-BRSA-1290-SPS) displays patterns consistent with enriched sources (E-MORB/OIB-type affinities), whereas the central well (3-BRSA- 883-RJS) exhibits signatures compatible with more depleted sources (N-MORB to E-MORB affinities). These interpretations require future isotopic validation for definitive source characterization. Differentiation processes operated predominantly through fractional crystallization in closed systems or systems with limited recharge (RFC). AFC modelling suggests crustal assimilation restricted to specific samples, with low assimilation rates (r = 0.2) - an inference that lacks independent isotopic confirmation. Sensitivity analysis confirms that varying assimilation rates between 0.1 and 0.3 produces compositional variations within 10-20% of observed values, but cannot unequivocally discriminate assimilation from source heterogeneity. The compositional diversity between wells primarily reflects melting of heterogeneous mantle domains at different depths within the spinel stability field. Academically, these results quantitatively support the role of mantle heterogeneities and lithospheric segmentation during Gondwana rifting. From an exploratory perspective, the petrogenetic characterization of the 'Parati' (Post-Rift, enriched sources) and 'Tupi' (Rift, depleted sources) members provides geochemical criteria for mapping petroleum systems in the Pre-Salt provinceen
dc.contributor.advisor1Valente, Sergio de Castro-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-7467-672Xpt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/7049948512331299pt_BR
dc.contributor.advisor-co1Rossetti, Marcos De Magalhães May-
dc.contributor.advisor-co1IDhttps://orcid.org/0000-0002-3792-4050pt_BR
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/0298468093126961pt_BR
dc.contributor.referee1Valente, Sergio de Castro-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-7467-672Xpt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/7049948512331299pt_BR
dc.contributor.referee2Rossetti, Marcos De Magalhães May-
dc.contributor.referee2IDhttps://orcid.org/0000-0002-3792-4050pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/0298468093126961pt_BR
dc.contributor.referee3Santos, Anderson Costa dos-
dc.contributor.referee3IDhttps://orcid.org/0000-0003-2526-8620pt_BR
dc.contributor.referee3Latteshttp://lattes.cnpq.br/4949133831525911pt_BR
dc.creator.IDhttps://orcid.org/0009-0000-0995-8504pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/0198912635154246pt_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
dc.subject.cnpqGeociênciaspt_BR
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