Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina
The Andes are the classic example of a subduction-related orogen. Segmentation of the orogenic belt is related to dynamics of the subduction zone and to upper plate thermomechanical properties. Understanding the controlling factors on deformation along the orogen requires studying cross sections at...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1553040X_v10_n3_p585_Mescua http://hdl.handle.net/20.500.12110/paper_1553040X_v10_n3_p585_Mescua |
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paper:paper_1553040X_v10_n3_p585_Mescua2023-06-08T16:23:04Z Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina Mescua, José Francisco Giambiagi, Laura Beatriz Ramos, Victor Alberto Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza The Andes are the classic example of a subduction-related orogen. Segmentation of the orogenic belt is related to dynamics of the subduction zone and to upper plate thermomechanical properties. Understanding the controlling factors on deformation along the orogen requires studying cross sections at different latitudes and determining the respective roles of plate interactions, upper plate weakness zones, and crustal architecture. A newly constructed balanced cross section of the Argentinean Andes at 35°S, in the transition between a fl at-slab and a normal subduction segment, shows tectonic inversion of Mesozoic normal faults and development of new thrusts during Andean shortening. Estimated shortening of 26.2 km, equivalent to 22% of the initial length, is lower than previous estimates obtained from partial cross sections using non-inversion structural models. Comparison of this estimate with crustal area balance constrained by geophysical data indicates that (1) crustal thickness was varied across the transect before Andean shortening, with a thick (~45 km) crustal block to the west related to late Paleozoic orogeny, and a thinner block (~32 km) in the east related to Mesozoic stretching; and (2) a structural model incorporating tectonic inversion is consistent with regional shortening and crustal thickness trends. Our results underscore the role of the inherited characteristics of the upper plate in subduction-related orogens, including preexisting faults and preorogenic crustal thickness variations. © 2014 Geological Society of America. 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:Ramos, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1553040X_v10_n3_p585_Mescua http://hdl.handle.net/20.500.12110/paper_1553040X_v10_n3_p585_Mescua |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza |
| spellingShingle |
Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza Mescua, José Francisco Giambiagi, Laura Beatriz Ramos, Victor Alberto Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina |
| topic_facet |
Faulting Geochronology Plates (structural components) Balanced cross sections Controlling factors Fold-and-thrust belts Foreland deformation Partial cross section Structural modeling Structural models Thermomechanical properties Structural geology Andean orogeny Cenozoic crustal shortening crustal structure crustal thickness deformation mechanism fold and thrust belt foreland basin slab subduction zone tectonic evolution tectonic setting thermomechanics Argentina Malargue Mendoza |
| description |
The Andes are the classic example of a subduction-related orogen. Segmentation of the orogenic belt is related to dynamics of the subduction zone and to upper plate thermomechanical properties. Understanding the controlling factors on deformation along the orogen requires studying cross sections at different latitudes and determining the respective roles of plate interactions, upper plate weakness zones, and crustal architecture. A newly constructed balanced cross section of the Argentinean Andes at 35°S, in the transition between a fl at-slab and a normal subduction segment, shows tectonic inversion of Mesozoic normal faults and development of new thrusts during Andean shortening. Estimated shortening of 26.2 km, equivalent to 22% of the initial length, is lower than previous estimates obtained from partial cross sections using non-inversion structural models. Comparison of this estimate with crustal area balance constrained by geophysical data indicates that (1) crustal thickness was varied across the transect before Andean shortening, with a thick (~45 km) crustal block to the west related to late Paleozoic orogeny, and a thinner block (~32 km) in the east related to Mesozoic stretching; and (2) a structural model incorporating tectonic inversion is consistent with regional shortening and crustal thickness trends. Our results underscore the role of the inherited characteristics of the upper plate in subduction-related orogens, including preexisting faults and preorogenic crustal thickness variations. © 2014 Geological Society of America. |
| author |
Mescua, José Francisco Giambiagi, Laura Beatriz Ramos, Victor Alberto |
| author_facet |
Mescua, José Francisco Giambiagi, Laura Beatriz Ramos, Victor Alberto |
| author_sort |
Mescua, José Francisco |
| title |
Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina |
| title_short |
Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina |
| title_full |
Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina |
| title_fullStr |
Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina |
| title_full_unstemmed |
Influence of pre-Andean history over cenozoic foreland deformation: Structural styles in the malargüe fold-and-thrust belt at 35°S, andes of Argentina |
| title_sort |
influence of pre-andean history over cenozoic foreland deformation: structural styles in the malargüe fold-and-thrust belt at 35°s, andes of argentina |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1553040X_v10_n3_p585_Mescua http://hdl.handle.net/20.500.12110/paper_1553040X_v10_n3_p585_Mescua |
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