Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen
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 For...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano http://hdl.handle.net/20.500.12110/paper_00044822_v68_n2_p246_Suriano |
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paper:paper_00044822_v68_n2_p246_Suriano2023-06-08T14:26:33Z Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen Suriano, Julieta Alonso, Maria Susana Limarino, Carlos Oscar Tedesco, Ana M. Cuesta del viento formation Precordillera Provenance Tertiary breccia conglomerate lacustrine environment lithostratigraphy metamorphic rock Miocene mudstone orogeny provenance sandstone sedimentology stratotype Croton ovalifolius 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. Fil:Suriano, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alonso, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tedesco, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano http://hdl.handle.net/20.500.12110/paper_00044822_v68_n2_p246_Suriano |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cuesta del viento formation Precordillera Provenance Tertiary breccia conglomerate lacustrine environment lithostratigraphy metamorphic rock Miocene mudstone orogeny provenance sandstone sedimentology stratotype Croton ovalifolius |
| spellingShingle |
Cuesta del viento formation Precordillera Provenance Tertiary breccia conglomerate lacustrine environment lithostratigraphy metamorphic rock Miocene mudstone orogeny provenance sandstone sedimentology stratotype Croton ovalifolius Suriano, Julieta Alonso, Maria Susana Limarino, Carlos Oscar Tedesco, Ana M. Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen |
| topic_facet |
Cuesta del viento formation Precordillera Provenance Tertiary breccia conglomerate lacustrine environment lithostratigraphy metamorphic rock Miocene mudstone orogeny provenance sandstone sedimentology stratotype Croton ovalifolius |
| description |
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. |
| author |
Suriano, Julieta Alonso, Maria Susana Limarino, Carlos Oscar Tedesco, Ana M. |
| author_facet |
Suriano, Julieta Alonso, Maria Susana Limarino, Carlos Oscar Tedesco, Ana M. |
| author_sort |
Suriano, Julieta |
| title |
Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen |
| title_short |
Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen |
| title_full |
Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen |
| title_fullStr |
Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen |
| title_full_unstemmed |
Cuesta del viento formation (nov. nom.): A new lithostratigraphic unit in the evolution of the precordillera Orogen |
| title_sort |
cuesta del viento formation (nov. nom.): a new lithostratigraphic unit in the evolution of the precordillera orogen |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p246_Suriano http://hdl.handle.net/20.500.12110/paper_00044822_v68_n2_p246_Suriano |
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