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Do Terreno Alto Moxotó, Província Borborema: Significado E Implicações Para O Gondwana Ocidental

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Do Terreno Alto Moxotó, Província Borborema: Significado E Implicações Para O Gondwana Ocidental UNIVERSIDADE DE BRASÍLIA – UnB INSTITUTO DE GEOCIÊNCIAS – IG O PALEOPROTEROZOICO (2.3 A 1.6 Ga) DO TERRENO ALTO MOXOTÓ, PROVÍNCIA BORBOREMA: SIGNIFICADO E IMPLICAÇÕES PARA O GONDWANA OCIDENTAL DISSERTAÇÃO DE MESTRADO Nº 305 Dissertação de Mestrado Lauro Cézar Montefalco de Lira Santos Orientador: Elton Luiz Dantas Brasília 2012 UNIVERSIDADE DE BRASÍLIA – UnB INSTITUTO DE GEOCIÊNCIAS – IG O PALEOPROTEROZOICO (2.3 A 1.6 Ga) DO TERRENO ALTO MOXOTÓ, PROVÍNCIA BORBOREMA: SIGNIFICADO E IMPLICAÇÕES PARA O GONDWANA OCIDENTAL Lauro Cézar Montefalco de Lira Santos Dissertação de Mestrado Banca Examinadora: Prof. Dr. Elton Luiz Dantas – UnB (Orientador) Prof. Dr. Reinhardt Adolfo Fuck Prof. Dr. Benjamin Bley de Brito Neves (Membro externo) Brasília 2012 Sumário Sumário....................................................................................................................................I Lista de Figuras........................................................................................................................III Lista de Tabelas.....................................................................................................................VIII Agradecimentos........................................................................................................................X Resumo.....................................................................................................................................XI Abstract...................................................................................................................................XII 1. INTRODUÇÃO..................................................................................................................1 1.1 Apresentação e Objetivos.............................................................................................1 1.2 Localização...................................................................................................................5 1.3 Justificativa do Tema Proposto....................................................................................7 1.4 Materiais e Métodos.....................................................................................................9 1.4.1 Petrografia e geologia de campo...........................................................................9 1.4.2 Litogeoquímica......................................................................................................9 1.4.3 Geocronologia e Geologia Isotópica.....................................................................9 1.4.4 Interpretação dos dados e confecção da dissertação............................................11 1.5 Plano de Dissertação...................................................................................................11 2. CONTEXTO GEOLÓGICO REGIONAL......................................................................12 2.1 Introdução Sobre a Província Borborema.....................................................................12 2.2 Subprovíncia Transversal..............................................................................................15 2.3 O Terreno Alto Moxotó no Âmbito da Província Borborema......................................16 3. ARTIGO 1.........................................................................................................................19 3.1 Resumo..........................................................................................................................20 3.2 Abstract.........................................................................................................................21 3.3 Introdução…………………………………………………………….........................22 3.4 Arcabouço litoestratigráfico………………………………………………………......25 3.5 Evolução tectônica........................................................................................................31 3.5.1 Tectônica contracional (evento Dn)…………………………………………....33 3.5.2 Tectônica transcorrente (evento Dn+1)da Vermelha Suite…………………….34 3.5.3 Tectônica transtracional (evento Dn+2)………………………………………..35 3.6 Metamorfismo.…………………………………………………..……………............37 I 3.7 Aspectos Conclusivos……………………………………………….....…..................42 3.8 Agradecimentos……………………………………………….........……...................45 4. ARTIGO 2 .........................................................................................................................46 4.1 Abstract.......................................................................................................................47 4.2 Introduction.................................................................................................................48 4.3 Geological Setting.......................................................................................................49 4.4 Micropetrographical Features......................................................................................59 4.4.1 Floresta Complex................................................................................................59 4.4.2 Malhada Vermelha Suite....................................................................................59 4.4.3 Pedra d´Água Suite............................................................................................60 4.4.4 Serra da Barra Suite...........................................................................................60 4.5 Analytical Procedures................................................................................................63 4.6 Whole Rock Geochemistry........................................................................................64 4.6.1. Floresta Complex..............................................................................................64 4.6.2 Malhada Vermelha Suite...................................................................................65 4.6.3. Pedra d´Água Suite..........................................................................................66 4.6.4. Serra da Barra Suite..........................................................................................67 4.7 Geochronological Data..............................................................................................73 4.7.1 Zircon LA-MC-ICP-MS U-Pb geochronology……………………………73 4.7.2 Sm-Nd Isotopes……………………………………………………………76 4.8 Discussion – Tectonic Implications…………………………………………………78 4.9 Conclusions…………………....................................................................................80 4.10 Acknowledgements………………...................................................................81 5 SÍNTESE CONCLUSIVA DA DISSERTAÇÃO.............................................................90 6 REFERÊNCIAS................................................................................................................93 II LISTA DE FIGURAS INTRODUÇÃO Figura 1 - Comparação entre os modelos de reconstrução do supercontinente Columbia (adaptado de Zhao et al. 2004). (a) Modelo de Rogers e Santosh (2002); (b) Reconstrução de Zhao et al. (2002a). Simbolos: (1) Trans-Hudson; (2) Penokeano; (3) Taltson – Thelon; (4) Wopmay; (5) New Quebec; (6) Tongat; (7) Foxe; (8) Makkovik-Ketidiano; (9) Ungava; (10) Nugssugtoqidiano; (11) Kola-Kareliano; (12) Svecofenniano; (13) Orogeno Volhyn – Rússia Central; (14) Pachelma; (15) Akitkan; (16) Orógeno Transártico; (17) Capricórnio; (18) Limpopo; (19) Transamazônico; (20) Eburmeano; (21) Orógeno Trans-Norte China; (22) Zona Tectônica Central da Índia; (23) Orógeno Central Aldano; (24) Orógeno Halls Creek...........................................................................................................................................2 Figura 2 – Compartimentação tectônica da América do Sul mostrando os principais domínios paleoproterozoicos distintos dos diferentes crátons, terrenos e blocos adjacentes. (adaptada e simplificada de Brito Neves 2011, modificada de Fuck et al., 2008.)...........................................................................................................................................4 Figura 3 – Localização geográfica da região de Sucuru (Paraíba) (área de estudo).........................................................................................................................................6 Figura 4 – Imagem de satélite de parte da Folha Sumé, com a área de estudo representada pelo retângulo preto. Notar a forma de cunha estrutural imposta pelas zonas de cisalhamento transcorrentes sinistrais do Congo e de Coxixola. TAM= Terreno Alto Moxotó, TRC = Terreno Rio Capibaribe...............................................................................................................8 III CONTEXTO GEOLÓGICO REGIONAL Figura 5 – Separação da Província Borborema em terrenos tectono-estratigráficos, modificado de Santoset al. 2000 e mapa esquemático dos terrenos da Subprovíncia Transversal, modificado e simplificado Santos e Medeiros (1999). AS – América do Sul. Domínios: DMC –Médio Coreaú, DCC –Ceará Central, DRN – Rio Grande do Norte, DT – Transversal, DM – Meridional. Terrenos: TCC – Ceará Central, TAC – Acaraú, TBN – Banabuiú, TOJ – Orós-Jaguaribe, TGJ – Granjeiro, TRP – Rio Piranhas, TSD –Seridó, TSJC – São José do Campestre, TOT – Ouricuri-Trindade, TPAB - Piancó-Alto-Brigída, TAP – Alto Pajeú, TAM – Alto Moxotó, TRC – Rio Capibaribe, TMO – Monte Orebe, TRPO – Riacho do Pontal, TPA – Pernambuco Alagoas, TCM – Canindé-Marancó, TSE – Sergipano. Principais Lineamentos: LTB – Trans- Brasiliano, LPA – Patos, LPE – Pernambuco...............................................................................................................................14
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