Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina

Coastal depositional systems are commonly classified in terms of the relative interaction of wave, tide and fluvial processes. The La Anita Formation represents the opportunity to study and better understand coastal sedimentary systems. It is a poorly studied prograding siliciclastic deltaic-coastal...

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Detalles Bibliográficos
Autores principales: Moyano Paz, Damián, Tettamanti, Camila, Varela, Augusto Nicolás, Cereceda, Abril, Poiré, Daniel Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Geología
Ciencias Naturales
Facies analysis
Deltaic systems
Wave processes
Fluvial processes
Sequence stratigraphy
Upper cretaceous
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/104690
http://hdl.handle.net/11336/97378
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-104690
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Ciencias Naturales
Facies analysis
Deltaic systems
Wave processes
Fluvial processes
Sequence stratigraphy
Upper cretaceous
spellingShingle Geología
Ciencias Naturales
Facies analysis
Deltaic systems
Wave processes
Fluvial processes
Sequence stratigraphy
Upper cretaceous
Moyano Paz, Damián
Tettamanti, Camila
Varela, Augusto Nicolás
Cereceda, Abril
Poiré, Daniel Gustavo
Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina
topic_facet Geología
Ciencias Naturales
Facies analysis
Deltaic systems
Wave processes
Fluvial processes
Sequence stratigraphy
Upper cretaceous
description Coastal depositional systems are commonly classified in terms of the relative interaction of wave, tide and fluvial processes. The La Anita Formation represents the opportunity to study and better understand coastal sedimentary systems. It is a poorly studied prograding siliciclastic deltaic-coastal wedge accumulated in the Campanian during the foreland stage of the Austral-Magallanes Basin. A detailed depositional process-based facies analysis have allowed the definition of 13 sedimentary facies and 9 facies associations for the La Anita Formation, ranging from prodelta to interdistributary delta-channel deposits. According to the spatial distribution of these facies associations, the La Anita Formation was divided into two informal units bounded by a regional erosion surface. The lower unit shows abundant hummocky cross-bedded and bioturbated sandstones, coarseningupward trends and mainly aggradational to progradational vertical stacking pattern, and it was interpreted as a wave-dominated fluvial-influenced delta. The upper unit is characterized by unidirectional dune cross-bedding, coarseningupward trend and a progradational vertical stacking pattern, and was interpreted as a fluvio-dominated delta with no evidence of tide or wave influence. These two units represent two genetically unrelated depositional sequences bounded by a regional erosion surface, which is interpreted as a sequence boundary triggered by a relative sea-level fall. The lower unit is part of a progradational highstand systems tract which involves the underlying deep-marine Alta Vista Formation. The upper unit deposits reflect a complete relative sea-level cycle which includes an undifferentiated lowstand and transgressive systems tracts and, toward the top, highstand systems tract.
format Articulo
Articulo
author Moyano Paz, Damián
Tettamanti, Camila
Varela, Augusto Nicolás
Cereceda, Abril
Poiré, Daniel Gustavo
author_facet Moyano Paz, Damián
Tettamanti, Camila
Varela, Augusto Nicolás
Cereceda, Abril
Poiré, Daniel Gustavo
author_sort Moyano Paz, Damián
title Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina
title_short Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina
title_full Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina
title_fullStr Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina
title_full_unstemmed Depositional processes and stratigraphic evolution of the Campanian deltaic system of La Anita Formation, Austral-Magallanes Basin, Patagonia, Argentina
title_sort depositional processes and stratigraphic evolution of the campanian deltaic system of la anita formation, austral-magallanes basin, patagonia, argentina
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/104690
http://hdl.handle.net/11336/97378
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