Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata
Desertification of Central Patagonia began between ~14–12 Ma and therefore was not directly connected to the opening of the Drake Passage and initial conformation of the Antarctica ice cap in early Miocene times. Local processes, in particular the uplift of the Southern Andes, seem to have played a...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v744_n_p134_Folguera http://hdl.handle.net/20.500.12110/paper_00401951_v744_n_p134_Folguera |
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paper:paper_00401951_v744_n_p134_Folguera2023-06-08T15:04:04Z Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata Neogene uplift Patagonian Andes Synorogenic strata U-Pb geochronology Basalt Binary alloys Deformation Geochronology Structural geology Uranium alloys Central Patagonia Chile triple junctions Foreland deformation Neo genes Out of sequences Patagonian Andes Synorogenic strata U-Pb geochronology Lead alloys deformation desertification geochronology ice cap Neogene orogeny triple junction uplift uranium-lead dating Andes Chile Ridge Cordillera Drake Passage Pacific Ocean Paraguay Patagonia Desertification of Central Patagonia began between ~14–12 Ma and therefore was not directly connected to the opening of the Drake Passage and initial conformation of the Antarctica ice cap in early Miocene times. Local processes, in particular the uplift of the Southern Andes, seem to have played a major role in climatic and biotic changes. We studied synorogenic strata filling a partly cannibalized foredeep between ~45° and 47°S at the latitudes of the Chile triple juction. Older synorogenic successions have yielded 18.7–16.4 Ma (U-Pb) in the western sector of the North Patagonian Cordillera corresponding to Meseta Guadal, Jeinemeni and Alto de Río Cisnes sections. This uplift was partly contemporaneous with broken foreland deformation associated with the San Bernardo fold belt to the east at 17.7–15 Ma. Younger synorogenic successions of 13.5 Ma (U-Pb), associated with a short pulse of major uplift that gave way to deposition of a thick conglomeratic succession, and subsequently finer-grained deposits of 12.3 Ma, are on the eastern Andean front in the Chalía and Guenguell sections, implying a retraction in orogenic activity, and out-of-sequence growth of the Patagonian Cordillera. Consequently, contractional deformation in this area ended after ~12 Ma, sealed by the extrusion of extensive alkali flood basalts, indicating that Neogene shortening only lasted ~6 My, ending around 6 My before the subduction of the Chile Ridge at the latitudes of Central Patagonia and 4.5 My before subduction at the southern tip of South America. © 2018 Elsevier B.V. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v744_n_p134_Folguera http://hdl.handle.net/20.500.12110/paper_00401951_v744_n_p134_Folguera |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Neogene uplift Patagonian Andes Synorogenic strata U-Pb geochronology Basalt Binary alloys Deformation Geochronology Structural geology Uranium alloys Central Patagonia Chile triple junctions Foreland deformation Neo genes Out of sequences Patagonian Andes Synorogenic strata U-Pb geochronology Lead alloys deformation desertification geochronology ice cap Neogene orogeny triple junction uplift uranium-lead dating Andes Chile Ridge Cordillera Drake Passage Pacific Ocean Paraguay Patagonia |
| spellingShingle |
Neogene uplift Patagonian Andes Synorogenic strata U-Pb geochronology Basalt Binary alloys Deformation Geochronology Structural geology Uranium alloys Central Patagonia Chile triple junctions Foreland deformation Neo genes Out of sequences Patagonian Andes Synorogenic strata U-Pb geochronology Lead alloys deformation desertification geochronology ice cap Neogene orogeny triple junction uplift uranium-lead dating Andes Chile Ridge Cordillera Drake Passage Pacific Ocean Paraguay Patagonia Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata |
| topic_facet |
Neogene uplift Patagonian Andes Synorogenic strata U-Pb geochronology Basalt Binary alloys Deformation Geochronology Structural geology Uranium alloys Central Patagonia Chile triple junctions Foreland deformation Neo genes Out of sequences Patagonian Andes Synorogenic strata U-Pb geochronology Lead alloys deformation desertification geochronology ice cap Neogene orogeny triple junction uplift uranium-lead dating Andes Chile Ridge Cordillera Drake Passage Pacific Ocean Paraguay Patagonia |
| description |
Desertification of Central Patagonia began between ~14–12 Ma and therefore was not directly connected to the opening of the Drake Passage and initial conformation of the Antarctica ice cap in early Miocene times. Local processes, in particular the uplift of the Southern Andes, seem to have played a major role in climatic and biotic changes. We studied synorogenic strata filling a partly cannibalized foredeep between ~45° and 47°S at the latitudes of the Chile triple juction. Older synorogenic successions have yielded 18.7–16.4 Ma (U-Pb) in the western sector of the North Patagonian Cordillera corresponding to Meseta Guadal, Jeinemeni and Alto de Río Cisnes sections. This uplift was partly contemporaneous with broken foreland deformation associated with the San Bernardo fold belt to the east at 17.7–15 Ma. Younger synorogenic successions of 13.5 Ma (U-Pb), associated with a short pulse of major uplift that gave way to deposition of a thick conglomeratic succession, and subsequently finer-grained deposits of 12.3 Ma, are on the eastern Andean front in the Chalía and Guenguell sections, implying a retraction in orogenic activity, and out-of-sequence growth of the Patagonian Cordillera. Consequently, contractional deformation in this area ended after ~12 Ma, sealed by the extrusion of extensive alkali flood basalts, indicating that Neogene shortening only lasted ~6 My, ending around 6 My before the subduction of the Chile Ridge at the latitudes of Central Patagonia and 4.5 My before subduction at the southern tip of South America. © 2018 Elsevier B.V. |
| title |
Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata |
| title_short |
Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata |
| title_full |
Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata |
| title_fullStr |
Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata |
| title_full_unstemmed |
Constraints on the Neogene growth of the central Patagonian Andes at the latitude of the Chile triple junction (45–47°S) using U/Pb geochronology in synorogenic strata |
| title_sort |
constraints on the neogene growth of the central patagonian andes at the latitude of the chile triple junction (45–47°s) using u/pb geochronology in synorogenic strata |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v744_n_p134_Folguera http://hdl.handle.net/20.500.12110/paper_00401951_v744_n_p134_Folguera |
| _version_ |
1768543410998738944 |