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The Neoproterozoic Macaúbas Group, Araçuaí orogen, SE Brazil

By
A. C. Pedrosa-Soares
A. C. Pedrosa-Soares
Universidade Federal de Minas Gerais, Instituto de Geociências-CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG, Brazil
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Marly Babinski
Marly Babinski
Universidade de São Paulo, Instituto de Geociências, Rua do Lago 562, Cidade Universitária 05508-080 São Paulo, SP, Brazil
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Carlos Noce
Carlos Noce
Universidade Federal de Minas Gerais, Instituto de Geociências-CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG, Brazil
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Maximiliano Martins
Maximiliano Martins
Universidade Federal de Minas Gerais, Instituto de Geociências-CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG, Brazil
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Gláucia Queiroga
Gláucia Queiroga
Universidade Federal de Minas Gerais, Instituto de Geociências-CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG, Brazil
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Francisco Vilela
Francisco Vilela
Universidade Federal de Minas Gerais, Instituto de Geociências-CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG, Brazil
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Published:
January 01, 2011

Abstract

The Neoproterozoic Macaúbas Group records accumulation in the precursor basin of the Araçuaí orogen, located on the eastern margin of the São Francisco craton (SE Brazil). The Macaúbas basin evolved from a late Tonian continental rift to a passive margin that lasted at least until c. 660 Ma. It was orogenically inverted during the late Neoproterozoic Brasiliano event. The Macaúbas Group includes the pre-glacial Matão, Duas Barras and Rio Peixe Bravo formations, the glaciogenic Serra do Catuni, Nova Aurora and Lower Chapada Acauã formations, and the post-glacial Upper Chapada Acauã and Ribeirão da Folha formations. In the central sector of the Araçuaí orogen, the oldest glaciogenic unit of the group, the Serra do Catuni Formation, overlies the sandstone-conglomerate package of the Duas Barras Formation. The Serra do Catuni Formation consists of massive diamictite with minor sandstone and rare pelite, deposited mostly in a proximal glaciomarine environment. This unit passes upward and eastward into the Lower Chapada Acauã Formation, a thick succession of stratified diamictite, graded sandstone, pelite, transitional basalt and rare carbonate. This distal glaciomarine unit is covered by the diamictite-free Upper Chapada Acauã Formation, which passes eastward into the Ribeirão da Folha Formation, which includes fine-grained turbidite, pelite and ocean-floor rocks. In the northern sector of the Araçuaí orogen, the sandstone-pelite succession of the pre-glacial Rio Peixe Bravo Formation is covered by the Nova Aurora Formation, the glaciomarine unit rich in diamictite and Fe-rich diamictite, with minor graded sandstone and rare pelite. The Nova Aurora Formation is covered by the sandstone-pelite package of the Upper Chapada Acauã Formation. The pre-glacial and glaciogenic successions record the continental rift to transitional stages of the Macaúbas basin. The post-glacial succession represents proximal and distal passive margin to ocean floor environments. The Serra do Catuni Formation seems to be a proximal glaciomarine equivalent of the Jequitaí glacio-terrestrial deposits located on the São Francisco craton.

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Contents

Geological Society, London, Memoirs

The Geological Record of Neoproterozoic Glaciations

Emmanuelle Arnaud
Emmanuelle Arnaud
University of Guelph, Canada
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Galen P. Halverson
Galen P. Halverson
McGill University, Canada
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Graham Shields-Zhou
Graham Shields-Zhou
University College London, UK
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Geological Society of London
Volume
36
ISBN electronic:
9781862394117
Publication date:
January 01, 2011

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