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Glacially influenced sedimentation of the Puga Formation, Cuiabá Group and Jacadigo Group, and associated carbonates of the Araras and Corumbá groups, Paraguay Belt, Brazil

By
Carlos J. S. Alvarenga
Carlos J. S. Alvarenga
1
Instituto de Geociências, Universidade de Brasília, Campus Darcy Ribeiro, CEP 70910-900, Brasília, Brazil
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Paulo C. Boggiani
Paulo C. Boggiani
2
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo, Brazil
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Marly Babinski
Marly Babinski
2
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo, Brazil
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Marcel A. Dardenne
Marcel A. Dardenne
1
Instituto de Geociências, Universidade de Brasília, Campus Darcy Ribeiro, CEP 70910-900, Brasília, Brazil
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Milene F. Figueiredo
Milene F. Figueiredo
2
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo, Brazil
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Elton L. Dantas
Elton L. Dantas
1
Instituto de Geociências, Universidade de Brasília, Campus Darcy Ribeiro, CEP 70910-900, Brasília, Brazil
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Alexandre Uhlein
Alexandre Uhlein
3
Instituto de Geociências, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Campus da Pampulha, CEP 31270-901, Belo Horizonte, Brazil
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Roberto V. Santos
Roberto V. Santos
1
Instituto de Geociências, Universidade de Brasília, Campus Darcy Ribeiro, CEP 70910-900, Brasília, Brazil
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Alcides N. Sial
Alcides N. Sial
4
Departmento de Geologia, Universidade Federal de Pernambuco, CEP 50732-970, Recife, PE, Brazil
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Roland Trompette
Roland Trompette
5
CEREGE, University d'Aix-Marseille III, CNRS-FU017, BP 13545, Aix-en-Provence, Cedex 04, France
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Published:
January 01, 2011

Abstract

Discontinuous exposures of diamictite (>1000 km) termed the Puga Formation (Fm.) and interpreted as being related to a late Cryogenian glacial event are known in the Paraguay Belt (Brazilian–Pan-African Orogeny) and part of the Amazon craton and Rio Apa Block. These diamictite units and a mixed assemblage of sandstone, conglomerate and claystone were first named the Jangada Group. Recent interpretations have shown that the diamictite of the Puga Formation passes laterally into metasediments of the Cuiabá Group, interpreted as glacially influenced turbidites. The correlative Jacadigo Group in the southern Paraguay Belt includes a thick succession of banded iron formation (BIF) bearing large boulders that have been interpreted as recording glacially influenced sedimentation. The diamictite of the Puga Fm. is overlain by two different carbonate-bearing successions, the Corumbá Group (Cadieus, Cerradinho, Bocaina, Tamengo and Guaicurus formations) in the south and the Araras Group (Mirassol d'Oeste, Guia, Nobres formations) in the north. Evidence of glaciation in the Puga Fm. consists of striated and faceted pebbles and blocks, and dropstones in the turbidites. Sedimentary and geochemical data from the associated carbonate reinforce the interpretation of a glacial origin. C, O and Sr isotope data from the northern Paraguay Belt are consistent with the proposed late Cryogenian age for the Puga Fm. sedimentation.

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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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