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The São Francisco craton in eastern Brazil contains two Paleoproterozoic orogenic features, which correspond to distinct segments of a collisional orogen developed between 2.1 and 1.9 Ga. The northern portion of the craton in Bahia state hosts a 300 km wide and 700 km long belt of amphibolite to granulite facies rocks that comprises three distinct Archean blocks and a Neoarchean/Paleoproterozoic magmatic arc (Fig. 1). The Paleoproterozoic rock assemblage consists of basic, ultrabasic and acid intrusions related to a ca. 2.5 Ga rifting event, 2.2-2.1 Ga old greenstone belt sequence, alluvial to marine foreland basin strata, and an 1.9 Ga late to post-collisional granite suite. The Mineiro belt, located in the southern end of the craton, in the highlands of Minas Gerais Fig. 1 Paleoproterozoic orogenic domains of the São Francisco craton involves an Archean basement, 2.5-2.0 Ga old passive margin to foreland basin strata, and a large volume of granitic rocks. The Paleoproterozoic section is best exposed in the mining district of the Quadrilátero Ferrífero (Iron Quadrangle), famous for its iron and gold deposits (Fig.1).
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The workshop is organized in three sections: a seven days long field trip in Bahia, one and half day of presentations and discussions in Ouro Preto, Minas Gerais, and four and half more days of field trips in the Quadrilátero Ferrifero region.
During the first section of the workshop, the field trip will traverse the Paleoproterozoic orogenic domain of northern São Francisco craton in Bahia, providing the participants a complete view of its rock assemblage and general architecture. After the indoor activities in Ouro Preto, the second field trip will concentrate on the Quadrilátero Ferrífero and adjacent areas of the Mineiro belt in the southern São Francisco craton. This trip will focus the supracrustal rock assemblage and tectonic framework of the foreland domain of the Mineiro belt.
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Fig. 1 Paleoproterozoic orogenic domains of the São Francisco craton
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Besides aspects of the local geology, the workshop aims to address the following topics of the scope of the IGCP 509:
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Paleoclimatic and Paleoecological significance of Paleoproterozoic banded iron formations and carbonate sequences. |
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Significance of the Paleoproterozoic orogenic domains of the São Francisco craton in terms of a supercontinent assembly between 2.1 and 1.9 Ga. |
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The Paleoproterozoic orogenic architecture as a transition between Archean and Phanerozoic tectonic styles. |
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The differential response of the Paleoproterozoic lithosphere to extensional tectonism. - Paleoproterozoic mineralization processes. |
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Field trip leaders:
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Johildo S.F. Barbosa (Universidade Federal da Bahia), Élson P. Oliveira (Universidade de Campinas), João B. Teixeira (Universidade Federal da Bahia), Maria da Glória da Silva (Universidade federal da Bahia), Luis Carlos Silva (Brazilian Geological Survey CPRM), João Dalton de Souza (Brazilian Geological Survey CPRM), Luis César Corrêa Gomes (Centro Federal de Educação Tecnológica da Bahia), and Carlson M.M. Leite (PETROBRAS), for the trips in Bahia.
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Fernando F.Alkmim (Universidade Federal de Ouro Preto) and Carlos M. Noce (Universidade Federal de Minas Gerais) for the trips in Minas Gerais. |
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Preliminary Workshop Program:
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BAHIA SECTION
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Sept.9th
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Morning
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Salvador: Workshop welcome
Introductory note: Johildo Barbosa
Outline of the geology of the Eastern Bahia orogenic domain
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Afternoon
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Trip to Santa Luz : The Serrinha block and The Rio Itapecuru greenstone belt
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Sept.10th
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Santa Luz region: Rio Itapecuru greenstone belt
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Sept.11th
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Santa Luz to Senhor do Bonfim: Itabuna-Salvador-Curaça belt and Gavião Block
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Sept.12th
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Jacobina region: Jacobina Group and Jacobina Gold Mine
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Sept.13th
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Lages-Jequiriçá transect: Jequié block
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Sept.14th
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Jequiriçá-Jequié transect: Jequié block
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Sept.15th
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19:00hs
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Jequié to Salvador: Jequié block and the Southern Itabuna-Salvador-Curaça belt
Flight to Belo Horizonte and drive to Ouro Preto
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OURO PRETO MEETING
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Sept.16th
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Morning
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Keynote: David Evans
The Paleoproterozoic Era and the IGCP 509
Keynote: Umberto Cordani
The Paleoproterozoic Record of South America
Presentations by the participants
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Afternoon
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Presentations by the participants
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Sept.17th
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Morning
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Presentations by the participants
Introductory note: Fernando Alkmim and Carlos Noce
Outline of the geology of Quadrilátero Ferrífero
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QUADRILÁTERO FERRÍFERO SECTION
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Sept.17th
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Afternoon
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Ouro Preto region: Stratigraphy and deformation history of the Minas Supergroup
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Sept.18th
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Ouro Preto to Congonhas: The southern QF and its mineral deposits
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Sept.19th
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Ouro Preto to Belo Horizonte: The Cauê Iron Formation and associated iron ores
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Sept.20th
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Belo Horizonte to Rio Acima: Lower Minas Supergroup and Gandarela syncline
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Sept.21th
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Belo Horizonte region: The Upper Minas Supergroup
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The Ouro Preto Meeting
The meeting will be held in the historical building of the Ouro Preto School of Mines and aims to provide the participants an opportunity to discuss topics of the scope of the IGCP 509. Participants are encouraged to submit abstracts for oral or poster presentations.
Deadline for abstract submission: Jun 30th
Abstract format: Abstracts must be written in English, limited to 1000 words, and contain: i) title; ii) authors list; iii) authors affiliation; iv) text body. We recommend the use of Microsoft Word (any version) in .doc or .rft file formats.
Presentations: 20 min (with 5min for questions) will be allocated for each oral presentation. Authors are strongly encouraged to prepare the presentations using PowerPoint. Projection facilities available will be one large screen, one LCD projector and one overhead projector. Poster max. size: 1,0m (width) x 1,20m (length).
For further information: e-mail ffalkmim@gmail.com
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Options
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Fees (US$)
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| Whole workshop, including the Salvador-Belo Horizonte flight ticket |
1000,00
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| 1st section, field trips in Bahia only |
500,00
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| Presentations in Ouro Preto only (hotels and meals not included) |
40,00
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| 2nd section, indoor activities and field trips in Minas Gerais only |
400,00
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Number of participants in the field trips: 25
Travel in Bahia and Minas Gerais will be by bus and accommodation will be in twin rooms in 2-3 stars hotels. All meals will be provided
Travel information
Brazil requires visa for some nationalities and countries of origin. Please, check at the nearest Brazilian embassy or consulate whether a visa is necessary or not.
Weather
In September, the weather in Bahia is normally hot and humid, with temperatures around 30 degrees celsius. In Minas Gerais, it will be probably dry with temperatures around 25 degrees celsius.
Registration Deadline: June 30th, 2006
Registration forms:
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