Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina

The stratigraphy and sedimentology of the Oligocene Río Leona Formation (Austral/Magallanes Basin) is described and interpreted on the basis of a study of two sections located in the area close to Viedma and Argentino Lakes in southern Argentina. This nonmarine unit unconformably rests on top of the...

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Autores principales:	Marenssi, Sergio Alfredo, Limarino, Carlos Oscar, Tripaldi, Alfonsina, Net, Laura Inés
Publicado:	2005
Materias:	Austral (Magallanes) Basin Fluvial systems Foreland basin Oligocene Río Leona Formation basin evolution eustacy fluvial deposit tectonic setting Argentina South America Western Hemisphere World
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v19_n3_p359_Marenssi http://hdl.handle.net/20.500.12110/paper_08959811_v19_n3_p359_Marenssi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08959811_v19_n3_p359_Marenssi
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spelling	paper:paper_08959811_v19_n3_p359_Marenssi2023-06-08T15:48:16Z Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina Marenssi, Sergio Alfredo Limarino, Carlos Oscar Tripaldi, Alfonsina Net, Laura Inés Austral (Magallanes) Basin Fluvial systems Foreland basin Oligocene Río Leona Formation basin evolution eustacy fluvial deposit Oligocene tectonic setting Argentina South America Western Hemisphere World The stratigraphy and sedimentology of the Oligocene Río Leona Formation (Austral/Magallanes Basin) is described and interpreted on the basis of a study of two sections located in the area close to Viedma and Argentino Lakes in southern Argentina. This nonmarine unit unconformably rests on top of the marine Eocene Man Aike Formation and is transitionally covered by the shallow marine, latest Oligocene-Early Miocene Centinela Formation. The Río Leona Formation is composed of varying percentages of conglomerates, sandstones, and mudstones, as well as thin but conspicuous levels of carbonaceous shales and volcaniclastic beds. The rocks represent sedimentation in different fluvial systems. Sedimentological data indicate a progressive change in the fluvial styles from high-energy braided systems to low-energy meandering and anastomosed systems. The landscape is envisaged to have evolved during the Oligocene from a high gradient piedmont area to a low-lying coastal plain. The Patagonian Sea flooded the area by the end of the Oligocene (22-25 My). Within the framework of the nonmarine sequence stratigraphic scheme for foreland basins, the Río Leona Formation deposits represent good examples of degradational, transitional, and aggradational systems tracks. The development of a basal unconformity and the erosion of the Eocene rocks suggest an initial uplift of the source area to the west. Changes in the fluvial systems indicate an increase of the accommodation space. The Oligocene evolution of this part of the Austral Basin probably reflects a combination of tectonic processes and eustatic sea-level changes. The former may be related to an episode of uplift in the southern Andes, followed by a period of tectonic quiescence and active volcanism with strong subsidence typical of foreland basin evolution. The latter may be linked to late Paleogene glaciation-deglaciation events in Antarctica. © 2005 Elsevier Ltd. All rights reserved. Fil:Marenssi, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tripaldi, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Net, L.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v19_n3_p359_Marenssi http://hdl.handle.net/20.500.12110/paper_08959811_v19_n3_p359_Marenssi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Austral (Magallanes) Basin Fluvial systems Foreland basin Oligocene Río Leona Formation basin evolution eustacy fluvial deposit Oligocene tectonic setting Argentina South America Western Hemisphere World
spellingShingle	Austral (Magallanes) Basin Fluvial systems Foreland basin Oligocene Río Leona Formation basin evolution eustacy fluvial deposit Oligocene tectonic setting Argentina South America Western Hemisphere World Marenssi, Sergio Alfredo Limarino, Carlos Oscar Tripaldi, Alfonsina Net, Laura Inés Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina
topic_facet	Austral (Magallanes) Basin Fluvial systems Foreland basin Oligocene Río Leona Formation basin evolution eustacy fluvial deposit Oligocene tectonic setting Argentina South America Western Hemisphere World
description	The stratigraphy and sedimentology of the Oligocene Río Leona Formation (Austral/Magallanes Basin) is described and interpreted on the basis of a study of two sections located in the area close to Viedma and Argentino Lakes in southern Argentina. This nonmarine unit unconformably rests on top of the marine Eocene Man Aike Formation and is transitionally covered by the shallow marine, latest Oligocene-Early Miocene Centinela Formation. The Río Leona Formation is composed of varying percentages of conglomerates, sandstones, and mudstones, as well as thin but conspicuous levels of carbonaceous shales and volcaniclastic beds. The rocks represent sedimentation in different fluvial systems. Sedimentological data indicate a progressive change in the fluvial styles from high-energy braided systems to low-energy meandering and anastomosed systems. The landscape is envisaged to have evolved during the Oligocene from a high gradient piedmont area to a low-lying coastal plain. The Patagonian Sea flooded the area by the end of the Oligocene (22-25 My). Within the framework of the nonmarine sequence stratigraphic scheme for foreland basins, the Río Leona Formation deposits represent good examples of degradational, transitional, and aggradational systems tracks. The development of a basal unconformity and the erosion of the Eocene rocks suggest an initial uplift of the source area to the west. Changes in the fluvial systems indicate an increase of the accommodation space. The Oligocene evolution of this part of the Austral Basin probably reflects a combination of tectonic processes and eustatic sea-level changes. The former may be related to an episode of uplift in the southern Andes, followed by a period of tectonic quiescence and active volcanism with strong subsidence typical of foreland basin evolution. The latter may be linked to late Paleogene glaciation-deglaciation events in Antarctica. © 2005 Elsevier Ltd. All rights reserved.
author	Marenssi, Sergio Alfredo Limarino, Carlos Oscar Tripaldi, Alfonsina Net, Laura Inés
author_facet	Marenssi, Sergio Alfredo Limarino, Carlos Oscar Tripaldi, Alfonsina Net, Laura Inés
author_sort	Marenssi, Sergio Alfredo
title	Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina
title_short	Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina
title_full	Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina
title_fullStr	Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina
title_full_unstemmed	Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina
title_sort	fluvial systems variations in the rio leona formation: tectonic and eustatic controls on the oligocene evolution of the austral (magallanes) basin, southernmost argentina
publishDate	2005
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v19_n3_p359_Marenssi http://hdl.handle.net/20.500.12110/paper_08959811_v19_n3_p359_Marenssi
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_version_	1768544186808664064

Fluvial systems variations in the Rio Leona Formation: Tectonic and eustatic controls on the Oligocene evolution of the Austral (Magallanes) Basin, southernmost Argentina

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