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Paleomagnetism and Petrogenesis of Paleoproterozoic Units from the Uatumã Event in the Northern Amazonian Craton Paul Yves Jean Antonio

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Paleomagnetism and Petrogenesis of Paleoproterozoic Units from the Uatumã Event in the Northern Amazonian Craton Paul Yves Jean Antonio Paleomagnetism and petrogenesis of Paleoproterozoic units from the Uatumã event in the northern Amazonian Craton Paul Yves Jean Antonio To cite this version: Paul Yves Jean Antonio. Paleomagnetism and petrogenesis of Paleoproterozoic units from the Uatumã event in the northern Amazonian Craton. Paleontology. Université Paul Sabatier - Toulouse III, 2017. English. NNT : 2017TOU30042. tel-01531494v2 HAL Id: tel-01531494 https://tel.archives-ouvertes.fr/tel-01531494v2 Submitted on 8 Jun 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Université Toulouse 3 Paul Sabatier (UT3 Paul Sabatier) Cotutelle internationale avec l'Université de São Paulo (IAG-USP) Paul Yves Jean Antonio le jeudi 16 février 2017 à São Paulo (Brésil) Paléomagnétisme et pétrogenèse des unités paléoprotérozoïques de l'évènement Uatumã au nord du craton amazonien. et discipline ou spécialité ED SDU2E : Sciences de la Terre et des Planètes Solides Géosciences et Environnement Toulouse(GET) Prof. Anne Nédélec Prof. Manoel Souza D'Agrella-Filho Jury : AnneAnne Nédélec Nédélec ProfesseurProfesseur émériteémérite DirectriceDirectrice de de thèse thèse Manoel Souza D'Agrella-Filho Maître de conférences Directeur de thèse Manoel Souza D’Agrella-Filho Maître de conférences Directeur de thèse Hervé Théveniau Directeur de recherche Rapporteur AugustoHervé Théveniaut Ernesto Rapalini MaîtreDirecteur de conférencesde recherche RapporteurRapporteur JeanAugusto Luc Bouchez Ernesto Rapalini ProfesseurMaître de conférences émérite PrésidentRapporteur du jury Wilson Teixeira Professeur d'Université Examinateur Jean Luc Bouchez Professeur émérite Président du jury Wilson Teixeira Professeur d’Université Examinateur Resumo UNIVERSIDADE DE SÃO PAULO INSTITUTO DE ASTRONOMIA, GEOFÍSICA E CIÊNCIAS ATMOSFÉRICAS DEPARTAMENTO DE GEOFÍSICA Paleomagnetismo e petrogênese de unidades Paleoproterozóicas do evento Uatumã no norte do Craton Amazônico Paul Yves Jean Antonio Orientadores: Prof. Dr Manoel Souza D’Agrella Filho Prof. Dr Anne Nédélec São Paulo Fevereiro de 2017 2 Resumo Paul Yves Jean Antonio Paleomagnetism and petrogenesis of Paleoproterozoic units from the Uatumã event in the northern Amazonian Craton. PhD thesis presented to the Instituto de Astronomia Geofísica e Ciências Atmosféricas da Universidade de São Paulo (IAG-USP) to obtain a PhD. In Geophysics. Supervisors: Prof. Dr Manoel Souza D’Agrella Filho Prof. Dr Anne Nédélec São Paulo February, 2017 3 Resumo AGRADECIMENTOS - REMERCIEMENTS Eu gostaria de agradecer prioritariamente meus orientadores da tese pela orientação e a confiança que me depositaram para terminar este trabalho. Ao Prof. Manoel Souza D’Agrella Filho que me orientou desde os trabalhos de campo até a redação da tese. Foi ele (e seus braços) quem me deu força para amostrar a Provincia Carajás. Je tenais aussi remercier le Prof. Anne Nédélec grâce à qui j’ai pu réaliser ce projet de recherche entre le Brésil et la France. Elle a toujours été présente dans ces 4 années de thèse pour prendre du temps afin de répondre à toutes mes questions. Gostaria de agradecer também o Prof. Ricardo I.F Trindade (meu terceiro Professor). Ele estava sempre lá para me ajudar, durante minha adaptação na vida brasileira, uma “casa”, minhas questões científicas e ainda mais... Agradeço vocês por estes quatro anos de tese que me ensinaram muito, cientificamente e humanamente (embora meu português não seja ainda muito bom). Também gostaria de agradecer todas as pessoas do laboratorio do IAG. Os (as) secretários (as) que perderam muito tempo com meus documentos (Marcel, Ana, Teca,....). Os técnicos e amigos do laboratorio que estavam sempre presentes quando nada funcionava e também, para beber uma cervejinha (Dani, Plinio, Giovanni). Também, a todos os estudantes do laboratorio que ficam as noites trabalhando para a ciencia (a lista é longa...). Agradeço especialmente Franklin Bispo dos Santos que sempre me ajudou a responder as minhas perguntas (quase meu quarto professor) e por todas as discussões sobre vários assuntos. Agradeço todos os Professores que me ajudaram durante os campos na Amazônia - o Prof. Davis Carvalho, o Profa. Marcia Barros, o Prof. Elming, o Prof. Roberto Dall’Agnol - e também os estudantes, Mayara Fraeda, Fernando Fernandes Da Silva, Bhrenno Marangoanha, Jão, Mariana... Também, à todas as pessoas do laboratorio de Ouro Preto (Prof. C. Lana e a Ana) que me ajudaram datar meus zircões e aos estudantes Carmen, Capucine, Léo..., por me ajudarem a descobrir esta cidade maravilhosa. Agradeço também à minha Carmen (meu amor que me ajudou até o final). Agradeço a todos os amigos que não são do IAG e que encontrei em São Paulo com quem eu descobri a vida brasileira (Jean Seb, Guigui, Nanahide, André, Vagner, Joelson, Ricardo, Pedro Sangafé e o O’ doborogodo, e o CEPE USP...). Agredeço também todas as pessoas com quem eu descobri o canionismo no Brasil. De temps à autres j’étais au laboratoire du GET à Toulouse donc je remercie encore toutes les personnes du laboratoire qui m’ont beaucoup aidé. Je remercie bien sûr Philippe et Sophie du service microsonde, Thierry du service MEB, Jo et Manu en salle blanche, et Stéphanie du TIMS. 4 Resumo Je remercie notamment tous les thésards et post-docs que j’ai côtoyés de près et de loin en passant par le père Boutin, Adrien, Thomas, Léandre, Damien, Arno, Bryan, Florent, Baptiste, Mathieu, Jing, Laetitia, Nicolas ; Sofia… et bien sûr Caro avec qui je partage cette fin de thèse et nos petits soucis sud-américains. Je dédicace bien sûr cette thèse à mes parents, ma grand-mère, ma famille, et mes amis qui m’ont toujours soutenu et supporté dans les moments difficiles ainsi qu’à mon papi qui est parti trop tôt et qui n’aura jamais pu voir la fin... Finally, I would like to thank the members of my dissertation committee - not only for their time and extreme patience, but for their intellectual contributions to improve the manuscript. Agradeço à Universidade Federal do Pará (UFPA) pelo suporte logístico nas viagens de campo e à FAPESP pelo suporte financeiro, através da bolsa de Doutorado (2012/20335- 4), da bolsa BEPE (2013/23036-0) e dos projetos de pesquisa (2011/50887-6, 2016/13689-5) que financiaram todo o meu trabalho. 5 Resumo Resumo Um grande magmatismo intraplaca cobriu várias áreas (1.500.000 km2) do Cráton Amazônico há 1880 Ma, o qual define uma grande província ígnea (SLIP) chamada coletivamente de "evento Uatumã". O objetivo deste trabalho é estudar o paleomagnetismo e a petrologia dessas rochas para definir o contexto espaço-temporal do evento Uatumã e a posição do cráton Amazônico dentro do Supercontinente Columbia. Duas áreas de estudo foram escolhidas para a amostragem, localizadas no sudoeste do cráton Amazônico (Pará): (1) A região de Tucumã, onde 16 diques félsicos, 7 diques máficos, um dique de gabro e 3 sítios da granodioritos do embasamento Arqueano foram coletadas. (2) A região de São Felix do Xingu, onde 7 sitios de lavas riolíticas, 2 sitios de ignimbritos, um dique felsico e um de brechas vulcânicas da Formação Santa Rosa foram amostrados. Seis sitios da Formação Sobreiro (rochas vulcanoclásticas andesíticas) e um dique felsico da Suite Velho Guilherme foram também coletados. O estudo petrológico em amostras dos diques felsicos de Tucumã (1880.9 ± 6.7 Ma U-Pb zrn) mostra que eles representam um sistema de siques associado à Formação vulcânica Santa Rosa. A magnetização remanente dos diques felsicos é portada por magnetita PSD e hematita. A hematita é sin- a pós-magmática e a mineralogia magnética pode ser usada para quantificar esta alteração hidrothermal. Desmagnetizações AF, térmica, LTD + AF e LTD + térmica mostram uma componente característica com direção noroeste e inclinação positiva (Componente A) para amostras de 16 sítios, cuja direção média é Dm= 330.5, Im= 27.9 (N= 16, α95= 11.4, R= 14.7, k= 11.47). O pólo paleomagnético calculado com a média dos PGVs está localizado em 52.9°S, 76.4°E (A95= 10.4°, K= 13.52). Entretanto, esta componente parece ser decorrente de uma remagnetização, provavelmente ocorrida durante o final do Neoproterozoico. Outra componente (chamada de Componente B) foi também isolada para estas rochas, a qual foi associada a uma remagnetização regional ocorrida durante a formação da Província Magmática do Atlântico Central (PMAC). Ainda, uma Terceira componente (C), representada por direções sudoeste e inclinações positivas baixas foi isolada para amostras de alguns sítios. Esta componente foi interpretada como sendo relacionada ao evento magmático da Suíte Intrusiva Velho Guilherme com idade de ~1860 Ma. Os melhores resultados, entretanto, foram obtidos para a região de São Felix do Xingu. Dois novos polos paleomagnéticos, considerados de origem primária, foram encontrados para o Craton Amazônico: O polo SF1 (319.7°E; 24.7°S; N= 10; A95= 16.9°) foi obtido para rochas félsicas e andesíticas, as quais foram datadas em 1877.4 ± 4.3 Ma (U-Pb zrn, LA-ICP-MS), sendo que sua origem primária é embasada em um teste de contato cozido inverso. A investigação petrográfica mostra que o portador magnético desta componente é atribuído à hematita, formada por processos hidrotermais tardi- a pós-magmáticos. O polo SF2 (220.1°E; 6 Resumo 31.1°S; N= 15; A95= 9.7°) foi determinado para a componente de magnetização revelada para o dique da Suíte Velho Guilherme, Esta componente é também encontrada como componente secundária em amostras das formações Santa Rosa e Sobreiro, além de algumas amostras de sítios coletados na região de Tucumã (Componente C). Uma idade de 1853.7 ± 6.2 Ma (U- Pb zrn, LA-ICP-MS) foi atribuída à componente SF2 e sua origem primária é confirmada pelo teste de contato cozido positivo realizado para este dique.
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