Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits
The South Central Andes at 30°S represent a key area to understand the Andes geodynamics as it is in the middle of the flat slab segment and all the morphotectonic units of the Central Andes are well developed. This work is focused in the proximal synorogenic deposits of the Western Precordillera, i...
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paper:paper_08959811_v75_n_p11_Suriano2023-06-08T15:48:56Z Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits Suriano, Julieta Mescua, José Francisco Giambiagi, Laura Beatriz Lossada, Ana Bermejo foreland basin San Juan Precordillera Wedgetop deposits foreland basin orogeny sedimentology strike (geology) uplift uranium-lead dating Andes Precordillera The South Central Andes at 30°S represent a key area to understand the Andes geodynamics as it is in the middle of the flat slab segment and all the morphotectonic units of the Central Andes are well developed. This work is focused in the proximal synorogenic deposits of the Western Precordillera, in the La Tranca valley, in order to unravel the uplift sequence of this belt. Nine facies associations were recognized; most of them represent piedmont facies with local provenance from Precordillera and were deposited in the wedge-top depozone, as is expected for proximal sinorogenic deposits. However there are intercalations of transference fluvial systems, which show mixed provenance indicating that Permo-Triassic igneous rocks were already exposed to the west (Frontal Cordillera). There are also lacustrine deposits which are interpreted as the result of damming by fault activity at east of the studied basin. Finally, two maximum depositional ages at ca. 11 Ma and 8 Ma of these deposits indicate that the onset of uplift of the Precordillera at 30°S is little older than 11 Ma. These data change two previous ideas about the evolution of the Precordillera: its uplift at 30° S is younger than proposed by previous works and it is nearly synchronous along strike. © 2017 Elsevier Ltd Fil:Suriano, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mescua, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Giambiagi, L.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lossada, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v75_n_p11_Suriano http://hdl.handle.net/20.500.12110/paper_08959811_v75_n_p11_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 |
Bermejo foreland basin San Juan Precordillera Wedgetop deposits foreland basin orogeny sedimentology strike (geology) uplift uranium-lead dating Andes Precordillera |
| spellingShingle |
Bermejo foreland basin San Juan Precordillera Wedgetop deposits foreland basin orogeny sedimentology strike (geology) uplift uranium-lead dating Andes Precordillera Suriano, Julieta Mescua, José Francisco Giambiagi, Laura Beatriz Lossada, Ana Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits |
| topic_facet |
Bermejo foreland basin San Juan Precordillera Wedgetop deposits foreland basin orogeny sedimentology strike (geology) uplift uranium-lead dating Andes Precordillera |
| description |
The South Central Andes at 30°S represent a key area to understand the Andes geodynamics as it is in the middle of the flat slab segment and all the morphotectonic units of the Central Andes are well developed. This work is focused in the proximal synorogenic deposits of the Western Precordillera, in the La Tranca valley, in order to unravel the uplift sequence of this belt. Nine facies associations were recognized; most of them represent piedmont facies with local provenance from Precordillera and were deposited in the wedge-top depozone, as is expected for proximal sinorogenic deposits. However there are intercalations of transference fluvial systems, which show mixed provenance indicating that Permo-Triassic igneous rocks were already exposed to the west (Frontal Cordillera). There are also lacustrine deposits which are interpreted as the result of damming by fault activity at east of the studied basin. Finally, two maximum depositional ages at ca. 11 Ma and 8 Ma of these deposits indicate that the onset of uplift of the Precordillera at 30°S is little older than 11 Ma. These data change two previous ideas about the evolution of the Precordillera: its uplift at 30° S is younger than proposed by previous works and it is nearly synchronous along strike. © 2017 Elsevier Ltd |
| author |
Suriano, Julieta Mescua, José Francisco Giambiagi, Laura Beatriz Lossada, Ana |
| author_facet |
Suriano, Julieta Mescua, José Francisco Giambiagi, Laura Beatriz Lossada, Ana |
| author_sort |
Suriano, Julieta |
| title |
Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits |
| title_short |
Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits |
| title_full |
Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits |
| title_fullStr |
Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits |
| title_full_unstemmed |
Uplift sequence of the Andes at 30°S: Insights from sedimentology and U/Pb dating of synorogenic deposits |
| title_sort |
uplift sequence of the andes at 30°s: insights from sedimentology and u/pb dating of synorogenic deposits |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v75_n_p11_Suriano http://hdl.handle.net/20.500.12110/paper_08959811_v75_n_p11_Suriano |
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