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The controversial stratigraphy of the glacial deposits in the Tandilia System, Argentina

By
P. J. Pazos
P. J. Pazos
Departamento de Ciencias Geológicas, FCEN, Ciudad Universitaria, Buenos Aires 1428, ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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A. Rapalini
A. Rapalini
Departamento de Ciencias Geológicas, FCEN, Ciudad Universitaria, Buenos Aires 1428, ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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Published:
January 01, 2011

Abstract

In the Ediacaran–Cambrian Tandilia System of central Argentina, the glacial origin of the thin (10 m) Sierra del Volcán Formation (Fm.) has been recognized for many years (Spalletti & del Valle 1984), being the first undisputed glacial deposits recorded in the Río de la Plata craton. It consists of three units: (i) a basal polymictic diamictite with a kaolin-rich matrix, (ii) a middle pelite with heterolithic levels, undulatory stratification, symmetric ripples, and outsized clasts previously interpreted as dropstones, and (iii) an upper polymictic diamictite with subtle normal grading. Here, this poorly age-constrained formation is reviewed from a stratigraphic and regional context and compared with other putative glaciogenic intervals at the base of the Cerro Largo Fm. and in the Punta Mogotes borehole.

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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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