Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina

This study analyses a 30-m-thick, sand-dominated succession intercalated between offshore mudstones in the Lower Cretaceous record of the Neuquen Basin, Argentina, defining facies associated with unidirectional currents as sand dunes (simple and compound), rippled sand sheets and heterolithic sheets...

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Autores principales: Veiga, Gonzalo Diego, Schwarz, Ernesto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Facies Association
Valanginian
Stratigraphic Architecture
Stratigraphic Evolution
Tidal Current Speed
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/133052
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-133052
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
Facies Association
Valanginian
Stratigraphic Architecture
Stratigraphic Evolution
Tidal Current Speed
spellingShingle Ciencias Naturales
Facies Association
Valanginian
Stratigraphic Architecture
Stratigraphic Evolution
Tidal Current Speed
Veiga, Gonzalo Diego
Schwarz, Ernesto
Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina
topic_facet Ciencias Naturales
Facies Association
Valanginian
Stratigraphic Architecture
Stratigraphic Evolution
Tidal Current Speed
description This study analyses a 30-m-thick, sand-dominated succession intercalated between offshore mudstones in the Lower Cretaceous record of the Neuquen Basin, Argentina, defining facies associated with unidirectional currents as sand dunes (simple and compound), rippled sand sheets and heterolithic sheets. These facies associations are related to the development of an offshore, forward-accreting dunefield developed as a response to the onset of a tidal-transport system. The reported stratigraphic record results from the combination of the gradual downcurrent decrease of the current speed together with the long-term climbing of the entire system. Maximum amplification of the tidal effect associated with incoming oceanic tides to this epicontinental sea would develop at the time of more efficient connection between the basin and the open ocean. Thus, the onset of the offshore tidal system approximately corresponds to the time of maximum flooding conditions (or immediately after). The short-term evolution of the tidal-transport system is more complex and characterized by the vertical stacking of small-scale cycles defined by the alternation of episodes of construction and destruction of the dunefield. The development of these cycles could be the response to changes in tidal current speed and transport capacity.
format Articulo
Articulo
author Veiga, Gonzalo Diego
Schwarz, Ernesto
author_facet Veiga, Gonzalo Diego
Schwarz, Ernesto
author_sort Veiga, Gonzalo Diego
title Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina
title_short Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina
title_full Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina
title_fullStr Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina
title_full_unstemmed Facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: Neuquén Basin, Argentina
title_sort facies characterization and sequential evolution of an ancient offshore dunefield in a semi-enclosed sea: neuquén basin, argentina
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/133052
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AT schwarzernesto faciescharacterizationandsequentialevolutionofanancientoffshoredunefieldinasemienclosedseaneuquenbasinargentina
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