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The Serra Azul Formation, Paraguay Belt, Brazil

By
Milene F. Figueiredo
Milene F. Figueiredo
Instituto de Geociências, Universidade de São Paulo, São Paulo-SP, 05508-080, Brazil
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Marly Babinski
Marly Babinski
Instituto de Geociências, Universidade de São Paulo, São Paulo-SP, 05508-080, Brazil
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Carlos J. S. Alvarenga
Carlos J. S. Alvarenga
Instituto de Geociências, Universidade de Brasília, Brasília, DF, 70910-900, Brazil
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Published:
January 01, 2011

Abstract

A new succession of diamictites and siltstones has been found within the Araras Group and is interpreted to record Ediacaran glaciation in the northern Paraguay Belt, Brazil. This discontinuous stratigraphic unit, named the Serra Azul Formation (Fm.) (Figueiredo et al. 2005; Alvarenga et al. 2007), is up to 300 m thick. It lies above dolomites of the Nobres Fm. and below sandstones of the Raizama Fm. At the stratotype section, the Serra Azul Fm. comprises c. 70 m of massive glacial diamictites, overlain by 200 m of laminated siltstones and rhythmites that contain sparse intercalations of very fine sandstone lenses.

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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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