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Abstract:

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.

Registro:

Documento: Artículo
Título:Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina
Autor:Cuitiño, J.I.; Santos, R.V.; Alonso Muruaga, P.J.; Scasso, R.A.
Filiación:Centro Nacional Patagónico (CENPAT), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Boulevard A. Brown 2915, Puerto Madryn, Chubut 9120, Argentina
Universidade de Brasília, Instituto de Geociências, Campus Universitário Darcy Ribeiro, Brasília DF, CEP 70910-900, Brazil
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires, Intendente Guiraldes 2160 (C1428EHA), Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:Patagonia; Patagoniense; Sedimentology; Sr-stratigraphy; Transgression; deposition; marine sediment; Miocene; sedimentation; sedimentology; sequence stratigraphy; topography; transgression; Argentina; Austral Basin; Patagonia; Ostreidae
Año:2015
Volumen:42
Número:3
Página de inicio:364
Página de fin:385
DOI: http://dx.doi.org/10.5027/andgeoV42n3-a05
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v42_n3_p364_Cuitino

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Citas:

---------- APA ----------
Cuitiño, J.I., Santos, R.V., Alonso Muruaga, P.J. & Scasso, R.A. (2015) . Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina . Andean Geology, 42(3), 364-385.
http://dx.doi.org/10.5027/andgeoV42n3-a05
---------- CHICAGO ----------
Cuitiño, J.I., Santos, R.V., Alonso Muruaga, P.J., Scasso, R.A. "Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina " . Andean Geology 42, no. 3 (2015) : 364-385.
http://dx.doi.org/10.5027/andgeoV42n3-a05
---------- MLA ----------
Cuitiño, J.I., Santos, R.V., Alonso Muruaga, P.J., Scasso, R.A. "Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina " . Andean Geology, vol. 42, no. 3, 2015, pp. 364-385.
http://dx.doi.org/10.5027/andgeoV42n3-a05
---------- VANCOUVER ----------
Cuitiño, J.I., Santos, R.V., Alonso Muruaga, P.J., Scasso, R.A. Sr-stratigraphy and sedimentary evolution of early Miocene marine foreland deposits in the northern Austral (Magallanes) basin, Argentina . Andean Geol. 2015;42(3):364-385.
http://dx.doi.org/10.5027/andgeoV42n3-a05