novembro, 2019

11nov(nov 11)8:00 am13(nov 13)6:00 pmField Trip Cabo Frio High: Structural and Tectonic Evolution of Onshore Basement

Detalhes do Evento

Course Outline

This field guide will discuss the tectonic evolution of the Cabo Frio Terrane (Heilbron et al. 2000a, 2003, 2008) which includes the onshore portion of the Cabo Frio High, a mainly offshore feature that separates the Campos and Santos Basins. The Cabo Frio Terrane (CFT) forms the basement of these basins, and is composed of mainly Paleoproterozoic orthogneisses (Região dos Lagos) with minor portions of Neoproterozoic high grade metasediments (Búzios Gneisses) (Heilbron et al. 1982, 2000a, 2003; Zimbres et al., 1990, Fonseca, 1993; Viana et al., 2008; Schmitt et al., 2012; Almeida et al., 2012). These rocks underwent ductile deformation and metamorphism during the last collisional-accretionary event of the Brasiliano orogenic cycle, the Búzios orogeny at ca 530-500 Ma (Schmitt et al. 2004 & 2008a). This orogenic cycle lead to the final assembly of the Gondwana Supercontinent and, in this segment, was responsible for the collage of São Francisco and Angola cratons and the closure of Adamastor Ocean, leading to the formation of Ribeira belt.

We will discuss the extent of reactivation of these basement structures during later extensional

events from the Eocretaceous rifting (Atlantic rift) with associated intrusion of tholeiitic dykes (ca. 130Ma), and the Cenozoic development of the Continental Rift of Southeast Brazil and alkaline magmatism (between 70-50Ma). These brittle tectonic events are represented in outcrop by faults, fracture zones, tholeiitic dykes and alkaline intrusions. The evolution of the Cabo Frio High will be discussed within the context of the break-up of Gondwana.

 

PROGRAMME – CABO FRIO HIGH FIELD EXCURSION

Day 1
8:00 Departure Rio de Janeiro – Associação Brasileira de Geólogos de Petróleo
8:00-11:00 In transit Rio de Janeiro – Pousada (158km)
11:00-11:30 Pousada Check-in and Technical and Safety Briefing
11:30-11:45 In transit: Pousada – Forte do São Mateus (3km) – Paleoproterozoic basement – Região dos Lagos Complex (orthogneisses) including Forte São Mateus orthoamphibolites
11:45-12:15 Light packed lunch (Forte de São Mateus)
12:15-14:00 Location #1 – Forte do São Mateus
14:00- 14:30 In transit: Forte do São Mateus – Praia das Conchas (8.5km)
14:30-17:00 Location #2 – Enseada das Conchas/Praia das Conchas – Cretaceous dykes and Cretaceous – Cenozoic faulting of orthogneisses of the Paleoproterozoic Região de Lagos Complex.
17:00-17:30 In transit: Praia das Conchas-Pousada (7.3km)

Day 2
8:00-9:00 In transit: Pousada – Arraial do Cabo (14.4km)
9:00-9:30 Safety Briefing – Arraial do Cabo
9:30-12:30 Boat outing – Locations: Ilha do Cabo Frio (#3), Fenda da Nossa Senhora (#4), Gruta Azul (#5), Ponta do Farol Novo Breccia (#6)*- Cenozoic alkaline magmatism. (*time and weather permitting)
12:30-13:00 Light packed lunch (Prainhas da Atalaia)
13:00-14:00 Location #7: Prainhas do Pontal do Atalaia – Cenozoic Alkaline Dykes
14:00-14:45 In transit: Prainhas da Atalaia – Pontal da Atalaia, Van Pick-up 14:30 – Rua Pontal da Atalaia / Araial Prainha (2km)
14:45-17:00 Location #8: Pontal da Atalaia – Orthogneisse of the Região de Lagos Complex cut by Cenozoic alkaline dykes.
17:00-18:00 In transit: Pontal da Atalaia – Pousada (18km)

Day 3
8:00-9:00 In transit: Pousada – Praia das Focas (24km)
9:00-11:30 Location #9 – Praia de Focas – Paragneisses of the Búzios Succession with Brasiliano deformation (ductile) and faulting
11:30-12:15 In transit: Praia das Focas – Mirante Ponta do Pai Vitorio/Condomimio Residencial Domo Diogo (15 km)
12:15-12:45 Light packed lunch (Mirante Ponta do Pai Vitorio)
12:30-14:30 Location #10 Pai Vitório Fault – São João Graben, Barreiras Formation, Cenozoic faulting
14:30-17:30 Return to Rio de Janeiro (165km)

Instrutores:

Dr. Julio Cesar Horta de Almeida – http://lattes.cnpq.br/0537716520189598

 

Investimento: R$ 3.000,00
Inscrições e informações pelo email: abgp@abgp.com.br
Inscrições limitadas: até 30/10
Incluído: transporte, hospedagem com café da manhã, lanche de campo, trajeto de barco.

Data

11 (Segunda-feira) 8:00 am - 13 (Quarta-feira) 6:00 pm

Localização

ABGP

Av. Almirante Barroso Nº 52

Patrocinadores e parceiros

ABGP

Contato

E-mail: abgp@abgp.com.br
Telefone: (021) 97287-0948

Nosso Endereço

Endereço: Av. Almirante Barroso
Nº 52/ 21º andar
Centro - Rio de Janeiro - RJ

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