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Abstract:

In this paper is defined the Cuesta del Viento Formation, a new lithostratigraphic unit related to the Andean Orogeny in western Precordillera. This unit unconformably covers sandstones and mudstones of the Puesto La Flecha Formation (Oligocene?) and low-grade metamorphic rocks of the Yerba Loca Formation (Ordovician). Cuesta del Viento Formation (520 m thick) is mainly composed of gray monomictic breccias and, to a lesser extent, of mudstones, sandstones and polymictic conglomerates. According to previously ages the upper levels of the Cuesta del Viento Formation were deposited during the Early Miocene. The sedimentological analysis of the stratotype, that outcrops in the La Tranca valley, allowed to recognize five facies associations. Facies association 1 is almost entirely composed of massive breccias which sometimes show chaotic stratification interpreted as colluvial fans dominated by gravity flows. Facies association 2 corresponds to stratified breccias that show lensoidal amalgamated beds and were deposited in multichannalized alluvial plains dominated by low-sinuosity channels. Facies association 3 is made up of sandstones and polymictic conglomerates bearing granitic and volcanic clasts. It is very likely that the composition of the clasts of this last facies association represents the by pass of sediments, by means of braided rivers, from the neighboring Rodeo-Iglesia Basin (from the west). Mudstones and scarce conglomerates, which form facies association 4, would represent sedimentation in a shallow lake system that included fluvial mouth bar deposits. Finally, facies association 5 is mainly composed of massive and laminated mudstones that sometimes show mudcracks, and a minor participation of monomictic breccias. This stratigraphic interval was probably deposited in playa lake environments.

Registro:

Documento: Artículo
Título:Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen
Autor:Suriano, J.; Alonso, M.S.; Limarino, C.O.; Tedesco, A.M.
Filiación:Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Palabras clave:Cuesta del viento formation; Precordillera; Provenance; Tertiary; breccia; conglomerate; lacustrine environment; lithostratigraphy; metamorphic rock; Miocene; mudstone; orogeny; provenance; sandstone; sedimentology; stratotype; Croton ovalifolius
Año:2011
Volumen:68
Número:2
Página de inicio:246
Página de fin:260
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano

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Citas:

---------- APA ----------
Suriano, J., Alonso, M.S., Limarino, C.O. & Tedesco, A.M. (2011) . Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen . Revista de la Asociacion Geologica Argentina, 68(2), 246-260.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano [ ]
---------- CHICAGO ----------
Suriano, J., Alonso, M.S., Limarino, C.O., Tedesco, A.M. "Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen " . Revista de la Asociacion Geologica Argentina 68, no. 2 (2011) : 246-260.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano [ ]
---------- MLA ----------
Suriano, J., Alonso, M.S., Limarino, C.O., Tedesco, A.M. "Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen " . Revista de la Asociacion Geologica Argentina, vol. 68, no. 2, 2011, pp. 246-260.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano [ ]
---------- VANCOUVER ----------
Suriano, J., Alonso, M.S., Limarino, C.O., Tedesco, A.M. Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen . Rev. Asoc. Geol. Argent. 2011;68(2):246-260.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano [ ]