Cenozoic building and deformational processes in the North Patagonian Andes
The Oligocene to present evolution of the North Patagonian Andes is analyzed linking geological and geophysical data in order to decipher the deformational processes that acted through time and relate them to basin formation processes. Seismic reflection profiles reveal the shallow structure of the...
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todo:paper_02643707_v86_n_p26_Orts2023-10-03T15:12:46Z Cenozoic building and deformational processes in the North Patagonian Andes Orts, D.L. Folguera, A. Giménez, M. Ruiz, F. Rojas Vera, E.A. Lince Klinger, F. Andean orogenesis Arc migration Foreland basin Gravity and magnetic data Patagonian Andes Shallow subduction Shortening Andean orogeny Cenozoic deformation depocenter foreland basin gravity field magnetic field slab subduction zone temperature anomaly volcanism Andes Patagonia The Oligocene to present evolution of the North Patagonian Andes is analyzed linking geological and geophysical data in order to decipher the deformational processes that acted through time and relate them to basin formation processes. Seismic reflection profiles reveal the shallow structure of the retroarc area where contractional structures, associated with Oligocene to early Miocene inverted extensional depocenters, are partially onlapped by early to late Miocene synorogenic deposits. From the construction of five structural cross sections along the retroarc area between 40° and 43°30'. S, constrained by surface, gravity and seismic data, a shortening gradient is observed along Andean strike. The highest shortening of 18.7. km (15.34%) is determined near 41°30'. S coincidentally with maximum mean topographic values on the eastern Andean slope, where basement blocks were uplifted in the orogenic front area, and the deepest and broadest synorogenic depocenters were formed towards the foreland. Additionally, eastward shifting of Miocene calc-alkaline rocks occurred at these latitudes, which is interpreted as indicative of a change in the subduction parameters at this time. Deep crustal retroarc structure is evaluated through inversion of gravity models that made possible to infer Moho attenuated zones. These coincide with the occurrence of younger than 5. Ma within-plate volcanics as well as with crustal thermal anomalies suggested by shallowing of the Curie isotherm calculated from magnetic data. Younger volcanism and thermal anomalies are explained by slab steepening since early Pliocene, after a mild-shallow subduction setting in the middle to late Miocene, age of the main compressive event. © 2015 Elsevier Ltd. Fil:Orts, D.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Folguera, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rojas Vera, E.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02643707_v86_n_p26_Orts |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Andean orogenesis Arc migration Foreland basin Gravity and magnetic data Patagonian Andes Shallow subduction Shortening Andean orogeny Cenozoic deformation depocenter foreland basin gravity field magnetic field slab subduction zone temperature anomaly volcanism Andes Patagonia |
| spellingShingle |
Andean orogenesis Arc migration Foreland basin Gravity and magnetic data Patagonian Andes Shallow subduction Shortening Andean orogeny Cenozoic deformation depocenter foreland basin gravity field magnetic field slab subduction zone temperature anomaly volcanism Andes Patagonia Orts, D.L. Folguera, A. Giménez, M. Ruiz, F. Rojas Vera, E.A. Lince Klinger, F. Cenozoic building and deformational processes in the North Patagonian Andes |
| topic_facet |
Andean orogenesis Arc migration Foreland basin Gravity and magnetic data Patagonian Andes Shallow subduction Shortening Andean orogeny Cenozoic deformation depocenter foreland basin gravity field magnetic field slab subduction zone temperature anomaly volcanism Andes Patagonia |
| description |
The Oligocene to present evolution of the North Patagonian Andes is analyzed linking geological and geophysical data in order to decipher the deformational processes that acted through time and relate them to basin formation processes. Seismic reflection profiles reveal the shallow structure of the retroarc area where contractional structures, associated with Oligocene to early Miocene inverted extensional depocenters, are partially onlapped by early to late Miocene synorogenic deposits. From the construction of five structural cross sections along the retroarc area between 40° and 43°30'. S, constrained by surface, gravity and seismic data, a shortening gradient is observed along Andean strike. The highest shortening of 18.7. km (15.34%) is determined near 41°30'. S coincidentally with maximum mean topographic values on the eastern Andean slope, where basement blocks were uplifted in the orogenic front area, and the deepest and broadest synorogenic depocenters were formed towards the foreland. Additionally, eastward shifting of Miocene calc-alkaline rocks occurred at these latitudes, which is interpreted as indicative of a change in the subduction parameters at this time. Deep crustal retroarc structure is evaluated through inversion of gravity models that made possible to infer Moho attenuated zones. These coincide with the occurrence of younger than 5. Ma within-plate volcanics as well as with crustal thermal anomalies suggested by shallowing of the Curie isotherm calculated from magnetic data. Younger volcanism and thermal anomalies are explained by slab steepening since early Pliocene, after a mild-shallow subduction setting in the middle to late Miocene, age of the main compressive event. © 2015 Elsevier Ltd. |
| format |
JOUR |
| author |
Orts, D.L. Folguera, A. Giménez, M. Ruiz, F. Rojas Vera, E.A. Lince Klinger, F. |
| author_facet |
Orts, D.L. Folguera, A. Giménez, M. Ruiz, F. Rojas Vera, E.A. Lince Klinger, F. |
| author_sort |
Orts, D.L. |
| title |
Cenozoic building and deformational processes in the North Patagonian Andes |
| title_short |
Cenozoic building and deformational processes in the North Patagonian Andes |
| title_full |
Cenozoic building and deformational processes in the North Patagonian Andes |
| title_fullStr |
Cenozoic building and deformational processes in the North Patagonian Andes |
| title_full_unstemmed |
Cenozoic building and deformational processes in the North Patagonian Andes |
| title_sort |
cenozoic building and deformational processes in the north patagonian andes |
| url |
http://hdl.handle.net/20.500.12110/paper_02643707_v86_n_p26_Orts |
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