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Abstract:

The La Pastosa beds constitute a nice example of sediments deposited in thehighly meandering reach of the fluvial-tidal transition within an estuary, developedat the top of the "Rionegrense" stage, a marine-estuarine sequence of late Mioceneage from Patagonia. Sedimentary facies include channel lags rich in mud intraclasts;cross-bedded sandstones with mud drapes and "set-climber" ripples; heterolithicand herringbone bedding; and inclined heterolithic stratification (IHS), and suggesta strong tidal influence. Tidal facies together with paucity of bioturbation andmarine fossils indicate that sedimentation took place mainly in brackish tidal-fluvialchannels, bounded by deposits formed in transgressive conditions at the base andat the top of the succession. Channel lag intraformational conglomerates are productof collapse of the cutbank due to erosion in the active margin of lateral migratingmeandering channels that eroded adjacent muddy tidal flats and salt marshes. Crossbeddedsandstones were accumulated above the conglomerates, forming subtidalsand dunes in the deeper parts of the channels and IHS was formed in point bars.Discontinuities at the base of the channels are the result of the entire channel-systemlateral migration, whereas discontinuities capped by small mud pebbles at the baseof large IHS sets are the result of seasonally increased run-off and widening of thechannels. Alternation of sandy and muddy IHS suggests periodical changes in theposition of the turbidity maximum due to seasonal variation of fluvial discharge,in good agreement with the seasonal climate in Patagonia during the late Miocene.IHS sets dipping alternatively to the north and south indicate lateral migration ofthe east-west running, high-sinuosity channels in the tightly meandering reach ofthe tidal-fluvial transition. The well preserved vertebrate fauna of Huayquerianmammal age is dominated by the hydrocherid Cardiatherium patagonicum togetherwith whistling ducks and loricariid fishes. This fauna inhabited out-of-channel,freshwater, low-energy restricted environments, like marshes and ponds where thecarcasses accumulated and underwent diagenetic fossilization. Repeated lateralmigration of meandering channels caused erosion of these deposits and the boneswere exhumed and incorporated into the channels, and finally concentrated inchannel lags after short transport. Combination of fossilization in a low-energyenvironment and concentration after short transport in meandering channels makethe fluvial-tidal transition "first class" deposits for prospecting vertebrate fossils. Inspite of exhumation and transport, vertebrate fossil association closely reflects theenvironments adjacent to the channels. Excellent preservation is more related torapid burial than to the energy level of the environment of final accumulation. © Asociacion Argentina de Sedimentologia - ISSN 1669 7316.

Registro:

Documento: Artículo
Título:Meandering tidal-fluvial channels and lag concentration of terrestrial vertebrates in the fluvialtidal transition of an ancient estuary in Patagonia
Autor:Scasso, R.A.; Teresa Dozo, M.; Cuitino, J.I.; Bouza, P.
Filiación:Departamento de Ciencias Geologicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 2, 1 Piso (1428), Ciudad Autonoma de Buenos Aires, Argentina
CENPAT - CONICET. Boulevard Brown N 2915, Puerto Madryn, Chubut, Argentina
Palabras clave:Fluvial-tidal transition; Miocene; Patagonia.; Sedimentology; Taphonomy
Año:2012
Volumen:19
Número:1
Página de inicio:27
Página de fin:45
Título revista:Latin American Journal of Sedimentology and Basin Analysis
Título revista abreviado:Latin Am. J. Sedimentol. Basin Anal.
ISSN:16697316
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16697316_v19_n1_p27_Scasso

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Citas:

---------- APA ----------
Scasso, R.A., Teresa Dozo, M., Cuitino, J.I. & Bouza, P. (2012) . Meandering tidal-fluvial channels and lag concentration of terrestrial vertebrates in the fluvialtidal transition of an ancient estuary in Patagonia. Latin American Journal of Sedimentology and Basin Analysis, 19(1), 27-45.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16697316_v19_n1_p27_Scasso [ ]
---------- CHICAGO ----------
Scasso, R.A., Teresa Dozo, M., Cuitino, J.I., Bouza, P. "Meandering tidal-fluvial channels and lag concentration of terrestrial vertebrates in the fluvialtidal transition of an ancient estuary in Patagonia" . Latin American Journal of Sedimentology and Basin Analysis 19, no. 1 (2012) : 27-45.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16697316_v19_n1_p27_Scasso [ ]
---------- MLA ----------
Scasso, R.A., Teresa Dozo, M., Cuitino, J.I., Bouza, P. "Meandering tidal-fluvial channels and lag concentration of terrestrial vertebrates in the fluvialtidal transition of an ancient estuary in Patagonia" . Latin American Journal of Sedimentology and Basin Analysis, vol. 19, no. 1, 2012, pp. 27-45.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16697316_v19_n1_p27_Scasso [ ]
---------- VANCOUVER ----------
Scasso, R.A., Teresa Dozo, M., Cuitino, J.I., Bouza, P. Meandering tidal-fluvial channels and lag concentration of terrestrial vertebrates in the fluvialtidal transition of an ancient estuary in Patagonia. Latin Am. J. Sedimentol. Basin Anal. 2012;19(1):27-45.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16697316_v19_n1_p27_Scasso [ ]