Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina

The Pampas plain (30°-41°S) has historically been considered as a sector that evolved independently from the adjacent Andean ranges. Nevertheless, the study of the Pampas showed that it is reasonable to expect an important influence from the Andes into the extraandean area. The Pampas plain can be d...

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Autores principales: Folguera, A., Zárate, M., Tedesco, A., Dávila, F., Ramos, V.A.
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Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v64_n_p452_Folguera
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spelling todo:paper_08959811_v64_n_p452_Folguera2023-10-03T15:43:20Z Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina Folguera, A. Zárate, M. Tedesco, A. Dávila, F. Ramos, V.A. Basin analysis Broken Andean foreland Dynamic topography Neogene Southern Pampa active margin deposition foreland basin Miocene Neogene Pliocene tectonic evolution tectonic setting topography Argentina Argentina Pampas Patagonia Ozophora (bug) The Pampas plain (30°-41°S) has historically been considered as a sector that evolved independently from the adjacent Andean ranges. Nevertheless, the study of the Pampas showed that it is reasonable to expect an important influence from the Andes into the extraandean area. The Pampas plain can be divided into two sectors: the northern portion, adjacent to the Pampean Ranges, has been studied by Davila (2005, 2007, 2010). The southern sector (34°-41°S) is the objective of the present work. The study of this area allowed to characterize two separate foreland basins: the Southern Pampa basin and the Northern Patagonian basin. The infill is composed of Late Miocene and Pliocene units, interpreted as distal synorogenic sequences associated with the late Cenozoic Andean uplift at this latitudinal range. These foreland basins have been defined based on facies changes, distinct depositional styles, along with the analysis of sedimentary and isopach maps. The basins geometries are proposed following De Celles and Gilles (1996) taking into account the infill geometry, distribution and grain size. In both cases, these depocenters are located remarkably far away from the Andean tectonics loads. Therefore they cannot be explained with short-wave subsidence patterns. Elastic models explain the tectonic subsidence in the proximal depocenters but fail to replicate the complete distal basins. These characteristics show that dynamic subsidence is controlling the subsidence in the Southern Pampas and Northern Patagonian basins. © 2015 Elsevier Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v64_n_p452_Folguera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Basin analysis
Broken Andean foreland
Dynamic topography
Neogene
Southern Pampa
active margin
deposition
foreland basin
Miocene
Neogene
Pliocene
tectonic evolution
tectonic setting
topography
Argentina
Argentina
Pampas
Patagonia
Ozophora (bug)
spellingShingle Basin analysis
Broken Andean foreland
Dynamic topography
Neogene
Southern Pampa
active margin
deposition
foreland basin
Miocene
Neogene
Pliocene
tectonic evolution
tectonic setting
topography
Argentina
Argentina
Pampas
Patagonia
Ozophora (bug)
Folguera, A.
Zárate, M.
Tedesco, A.
Dávila, F.
Ramos, V.A.
Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina
topic_facet Basin analysis
Broken Andean foreland
Dynamic topography
Neogene
Southern Pampa
active margin
deposition
foreland basin
Miocene
Neogene
Pliocene
tectonic evolution
tectonic setting
topography
Argentina
Argentina
Pampas
Patagonia
Ozophora (bug)
description The Pampas plain (30°-41°S) has historically been considered as a sector that evolved independently from the adjacent Andean ranges. Nevertheless, the study of the Pampas showed that it is reasonable to expect an important influence from the Andes into the extraandean area. The Pampas plain can be divided into two sectors: the northern portion, adjacent to the Pampean Ranges, has been studied by Davila (2005, 2007, 2010). The southern sector (34°-41°S) is the objective of the present work. The study of this area allowed to characterize two separate foreland basins: the Southern Pampa basin and the Northern Patagonian basin. The infill is composed of Late Miocene and Pliocene units, interpreted as distal synorogenic sequences associated with the late Cenozoic Andean uplift at this latitudinal range. These foreland basins have been defined based on facies changes, distinct depositional styles, along with the analysis of sedimentary and isopach maps. The basins geometries are proposed following De Celles and Gilles (1996) taking into account the infill geometry, distribution and grain size. In both cases, these depocenters are located remarkably far away from the Andean tectonics loads. Therefore they cannot be explained with short-wave subsidence patterns. Elastic models explain the tectonic subsidence in the proximal depocenters but fail to replicate the complete distal basins. These characteristics show that dynamic subsidence is controlling the subsidence in the Southern Pampas and Northern Patagonian basins. © 2015 Elsevier Ltd.
format JOUR
author Folguera, A.
Zárate, M.
Tedesco, A.
Dávila, F.
Ramos, V.A.
author_facet Folguera, A.
Zárate, M.
Tedesco, A.
Dávila, F.
Ramos, V.A.
author_sort Folguera, A.
title Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina
title_short Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina
title_full Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina
title_fullStr Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina
title_full_unstemmed Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina
title_sort evolution of the neogene andean foreland basins of the southern pampas and northern patagonia (34°-41°s), argentina
url http://hdl.handle.net/20.500.12110/paper_08959811_v64_n_p452_Folguera
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