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Book Chapter

The Playa Hermosa Formation, Playa Verde Basin, Uruguay

By
P. J. Pazos
P. J. Pazos
Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires 1428, ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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A. E. Rapalini
A. E. Rapalini
Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires 1428, ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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L. Sánchez Bettucci
L. Sánchez Bettucci
Facultad de Ciencias, Universidad de la República, Iguá 4225, 11400 Montevideo, Uruguay
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O. R. Tófalo
O. R. Tófalo
Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires 1428, Argentina
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Published:
January 01, 2011

Abstract

The Playa Hermosa Formation (Fm.) (Playa Verde Basin) is a volcano-sedimentary unit that crops out in the extreme south of the Dom Feliciano Belt in Uruguay. This formation has traditionally been interpreted as non-glacial in origin, but recently it has been suggested that the lower part at least may be glacially influenced. The stratigraphic position of the Playa Hermosa Fm. and its correlation with other Neoproterozoic units of Uruguay, Argentina and southern Brazil remains in dispute. An age of c. 580 Ma is indicated by a hornblende 39Ar/40Ar age on magmatism regarded as coeval with syn-sedimentary volcanism. Preliminary palaeomagnetic data suggest a primary remanence and a mean geomagnetic pole consistent with the proposed apparent polar wander path for the Río de La Plata craton. In combination, these data suggest mid-Ediacaran glacial sedimentation in low to intermediate latitudes on the Río de la Plata craton. However, this conclusion needs to be reinforced by more thorough studies of the age and origin of the Playa Hermosa Fm.

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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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