Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms

Linear aeolian bedforms are the most abundant bedform type in modern Earth sand seas and are very common in our Solar System. Despite their abundance, the long-term development of these bedforms and its impact upon the resulting sedimentary architecture in the geological record is still poorly under...

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Detalles Bibliográficos
Autores principales:	Argüello Scotti, Agustín, Veiga, Gonzalo Diego
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2019
Materias:	Geología Sedimentary architecture Aeolian linear bedforms Bedform development 24 Cretaceous Neuquén Basin Troncoso Inferior
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/127063
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-127063
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Geología Sedimentary architecture Aeolian linear bedforms Bedform development 24 Cretaceous Neuquén Basin Troncoso Inferior
spellingShingle	Geología Sedimentary architecture Aeolian linear bedforms Bedform development 24 Cretaceous Neuquén Basin Troncoso Inferior Argüello Scotti, Agustín Veiga, Gonzalo Diego Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms
topic_facet	Geología Sedimentary architecture Aeolian linear bedforms Bedform development 24 Cretaceous Neuquén Basin Troncoso Inferior
description	Linear aeolian bedforms are the most abundant bedform type in modern Earth sand seas and are very common in our Solar System. Despite their abundance, the long-term development of these bedforms and its impact upon the resulting sedimentary architecture in the geological record is still poorly understood. The aims of this paper are to study the exposed record of an ancient linear megadune in order to discuss the factors that impact the development and sedimentary architecture of aeolian linear bedforms. The outcrops of the ancient Troncoso Sand Sea (Barremian, Neuquen Basin, Argentina) provide a unique opportunity to access a preserved megadune record with an external body geometry that unequivocally confirms its linear morphology. Architectural analysis of the bedform record reveals significant differences for several aspects of cross-stratified set bodies and bounding surfaces and allows for the identification of three architectural complexes. Insights from deterministic models, analysis of set body relative chronology and distribution suggest that complexes result from distinctive phases in bedform development. It also clearly shows that the megadune’s construction was achieved by expansion from a core, where the oldest deposits are located, and that its development was characterized by sustained growth and strong longitudinal dynamics. Factors that impact the development and architecture of linear bedforms are identified, discussed, and compared to bedforms of transverse dynamics. Finally, a scheme of expected styles of sedimentary architecture for linear bedforms is presented. This case study shows how growth can be a critical factor conditioning linear bedform architecture and indicates how the preservation of certain styles of sedimentary architecture in the geological record may not be as unusual as previously thought.
format	Articulo Preprint
author	Argüello Scotti, Agustín Veiga, Gonzalo Diego
author_facet	Argüello Scotti, Agustín Veiga, Gonzalo Diego
author_sort	Argüello Scotti, Agustín
title	Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms
title_short	Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms
title_full	Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms
title_fullStr	Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms
title_full_unstemmed	Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms
title_sort	sedimentary architecture of an ancient linear megadune (barremian, neuquén basin): insights into the long-term development and evolution of aeolian linear bedforms
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/127063
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bdutipo_str	Repositorios
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Sedimentary architecture of an ancient linear megadune (Barremian, Neuquén Basin): insights into the long-term development and evolution of aeolian linear bedforms

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