Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)

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Permian red beds of the De La Cuesta Formation in the Sierra de Narváez (Paganzo Basin, northwestern Argentina) are essentially composed of sandstones associated with mudstones and subordinate conglomerates. Facies distributions and stacking patterns indicate that these sediments resulted from the i...

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Autores principales: Spalletti, Luis Antonio, Limarino, Carlos Oscar, Colombo Piñol, Ferran
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Geología
Erg sequence
Permian
Argentina
Western gondwana
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/95482
https://ri.conicet.gov.ar/11336/68797
http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001581
https://www.redalyc.org/articulo.oa?id=50515686006
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-95482
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Geología
Erg sequence
Permian
Argentina
Western gondwana
spellingShingle Ciencias Naturales
Geología
Erg sequence
Permian
Argentina
Western gondwana
Spalletti, Luis Antonio
Limarino, Carlos Oscar
Colombo Piñol, Ferran
Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)
topic_facet Ciencias Naturales
Geología
Erg sequence
Permian
Argentina
Western gondwana
description Permian red beds of the De La Cuesta Formation in the Sierra de Narváez (Paganzo Basin, northwestern Argentina) are essentially composed of sandstones associated with mudstones and subordinate conglomerates. Facies distributions and stacking patterns indicate that these sediments resulted from the interaction between aeolian and ephemeral fluvial systems, and are represented by aeolian dune, dry aeolian interdune and aeolian sand sheet, mudflat, wet aeolian interdune, and fluvial deposits. The De La Cuesta Formation is characterised by aeolian (erg) sequences alternating with non-aeolian (terminal alluvial fan - mudflat) sequences. Each erg sequence is bounded at its base by a regionally extensive sand-drift surface and at the top by an extinction surface. A number of architectural elements, including aeolian dunes limited by interdunes, grouped crescentic aeolian dunes, longitudinal dunes, and draa with superimposed crescentic dunes are recognised in the erg sequences. The sand sea developed during phases of increasing aridity, whereas non-aeolian deposition might have occurred during more humid phases. Thus, the styles of aeolian-fluvial interaction are considered to result from cyclical climatic changes. Within the drier hemicycles, the rhythmic alternation between draa deposits and aeolian dune and interdune deposits indicates higher frequency cycles that could be attributed to subtle climatic oscillations and/ or changes in sand supply and availability. The development of the Permian sand sea in the inland Paganzo Basin seems to be related to the growth of a volcanic chain to the west. This topographic barrier separated the Paganzo Basin from the Chilean Basin, located along the western margin of Gondwana and characterised by shallow marine carbonate sedimentation. The correlation between the Permian erg and the shallow marine carbonates suggests a regional warming period during the Middle Permian in western Gondwana.
format Articulo
Articulo
author Spalletti, Luis Antonio
Limarino, Carlos Oscar
Colombo Piñol, Ferran
author_facet Spalletti, Luis Antonio
Limarino, Carlos Oscar
Colombo Piñol, Ferran
author_sort Spalletti, Luis Antonio
title Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)
title_short Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)
title_full Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)
title_fullStr Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)
title_full_unstemmed Internal anatomy of an erg sequence from the aeolian-fluvial system of the De La Cuesta Formation (Paganzo Basin, northwestern Argentina)
title_sort internal anatomy of an erg sequence from the aeolian-fluvial system of the de la cuesta formation (paganzo basin, northwestern argentina)
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/95482
https://ri.conicet.gov.ar/11336/68797
http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001581
https://www.redalyc.org/articulo.oa?id=50515686006
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