Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina

Early Miocene shallow marine deposits in the region of Lago Posadas-Meseta Belgrano (Argentina) represent part of the “Patagoniense” transgression, an Atlantic marine incursion that flooded large part of Patagonia, including the Austral (foreland) Basin (southern Patagonia). These deposits, referred...

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Detalles Bibliográficos
Publicado: 2015
Materias:
Patagonia
Patagoniense
Sedimentology
Sr-stratigraphy
Transgression
deposition
marine sediment
Miocene
sedimentation
sedimentology
sequence stratigraphy
topography
transgression
Argentina
Austral Basin
Ostreidae
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v42_n3_p364_Cuitino
http://hdl.handle.net/20.500.12110/paper_07187092_v42_n3_p364_Cuitino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_07187092_v42_n3_p364_Cuitino
record_format dspace
spelling paper:paper_07187092_v42_n3_p364_Cuitino2023-06-08T15:43:18Z Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina Patagonia Patagoniense Sedimentology Sr-stratigraphy Transgression deposition marine sediment Miocene sedimentation sedimentology sequence stratigraphy topography transgression Argentina Austral Basin Patagonia Ostreidae Early Miocene shallow marine deposits in the region of Lago Posadas-Meseta Belgrano (Argentina) represent part of the “Patagoniense” transgression, an Atlantic marine incursion that flooded large part of Patagonia, including the Austral (foreland) Basin (southern Patagonia). These deposits, referred as El Chacay (Argentina) or Guadal (Chile) formations, and the transition to the overlying Santa Cruz Formation were divided into six facies: subtidal sand-bars, shallow marine sandy deposits, muddy shelf deposits, estuarine complex deposits, fluvial channels and fluvial floodplains. These are arranged in a general transgressive-regressive cycle, subdivided into two stratigraphic sequences, separated by a major erosional surface.87Sr/86Sr ages from shell carbonate in eight oysters yielded an age range of 20.3 to 18.1 Ma for these “Patagoniense” deposits. Correlation with other dated “Patagoniense” sections in southern Patagonia, like those at Lago Argentino or Comodoro Rivadavia, indicates that they belong to a single transgression that flooded several Patagonian basins approximately at the same time. Eustasy, flexural subsidence created by tectonic loading in the adjacent fold-and-thrust belt, and basin floor paleo-topography controlled the duration of the depositional event and the sedimentation style of these shallow marine deposits. © 2015, Servicio Nacional de Geologia y Mineria. All rights reserved. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v42_n3_p364_Cuitino http://hdl.handle.net/20.500.12110/paper_07187092_v42_n3_p364_Cuitino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Patagonia
Patagoniense
Sedimentology
Sr-stratigraphy
Transgression
deposition
marine sediment
Miocene
sedimentation
sedimentology
sequence stratigraphy
topography
transgression
Argentina
Austral Basin
Patagonia
Ostreidae
spellingShingle Patagonia
Patagoniense
Sedimentology
Sr-stratigraphy
Transgression
deposition
marine sediment
Miocene
sedimentation
sedimentology
sequence stratigraphy
topography
transgression
Argentina
Austral Basin
Patagonia
Ostreidae
Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
topic_facet Patagonia
Patagoniense
Sedimentology
Sr-stratigraphy
Transgression
deposition
marine sediment
Miocene
sedimentation
sedimentology
sequence stratigraphy
topography
transgression
Argentina
Austral Basin
Patagonia
Ostreidae
description Early Miocene shallow marine deposits in the region of Lago Posadas-Meseta Belgrano (Argentina) represent part of the “Patagoniense” transgression, an Atlantic marine incursion that flooded large part of Patagonia, including the Austral (foreland) Basin (southern Patagonia). These deposits, referred as El Chacay (Argentina) or Guadal (Chile) formations, and the transition to the overlying Santa Cruz Formation were divided into six facies: subtidal sand-bars, shallow marine sandy deposits, muddy shelf deposits, estuarine complex deposits, fluvial channels and fluvial floodplains. These are arranged in a general transgressive-regressive cycle, subdivided into two stratigraphic sequences, separated by a major erosional surface.87Sr/86Sr ages from shell carbonate in eight oysters yielded an age range of 20.3 to 18.1 Ma for these “Patagoniense” deposits. Correlation with other dated “Patagoniense” sections in southern Patagonia, like those at Lago Argentino or Comodoro Rivadavia, indicates that they belong to a single transgression that flooded several Patagonian basins approximately at the same time. Eustasy, flexural subsidence created by tectonic loading in the adjacent fold-and-thrust belt, and basin floor paleo-topography controlled the duration of the depositional event and the sedimentation style of these shallow marine deposits. © 2015, Servicio Nacional de Geologia y Mineria. All rights reserved.
title Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
title_short Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
title_full Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
title_fullStr Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
title_full_unstemmed Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
title_sort sr-stratigraphy and sedimentary evolution of early miocene marine foreland deposits in the northern austral (magallanes) basin, argentina
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v42_n3_p364_Cuitino
http://hdl.handle.net/20.500.12110/paper_07187092_v42_n3_p364_Cuitino
_version_ 1768545147814936576

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