Late Cretaceous to recent plate motions in western South America revisited

The Andean Cordillera has evolved since the Late Cretaceous in the context of subduction of oceanic lithosphere beneath continental lithosphere, making the kinematics between South America and its adjacent oceanic plates in the Pacific basin valuable to analyze the development of the Andean orogen....

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Autores principales:	Somoza, Ruben, Ghidella, Marta Elba
Publicado:	2012
Materias:	Andes Cenozoic Convergence Late Cretaceous Continental lithosphere Convergence rates Hot-spot model Late cretaceous Late Neogene Late Oligocene Nazca plate Neo genes Oceanic lithosphere Oceanic plate Patagonia Plate motions South America Triple junction Lithology Tectonics Andean orogeny continental lithosphere Cretaceous deformation hot spot oceanic lithosphere plate motion subduction trench triple junction Chile Pacific Ocean Peru
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v331-332_n_p152_Somoza http://hdl.handle.net/20.500.12110/paper_0012821X_v331-332_n_p152_Somoza
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_0012821X_v331-332_n_p152_Somoza
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spelling	paper:paper_0012821X_v331-332_n_p152_Somoza2023-06-08T14:35:32Z Late Cretaceous to recent plate motions in western South America revisited Somoza, Ruben Ghidella, Marta Elba Andes Cenozoic Convergence Late Cretaceous Andes Cenozoic Continental lithosphere Convergence Convergence rates Hot-spot model Late cretaceous Late Neogene Late Oligocene Nazca plate Neo genes Oceanic lithosphere Oceanic plate Patagonia Plate motions South America Triple junction Lithology Tectonics Andean orogeny Cenozoic continental lithosphere Cretaceous deformation hot spot Nazca plate oceanic lithosphere plate motion subduction trench triple junction Andes Chile Pacific Ocean Peru South America The Andean Cordillera has evolved since the Late Cretaceous in the context of subduction of oceanic lithosphere beneath continental lithosphere, making the kinematics between South America and its adjacent oceanic plates in the Pacific basin valuable to analyze the development of the Andean orogen. The latest Cretaceous-Cenozoic convergence history in western South America may be divided into three stages. The youngest Stage 1 (25-0. Ma) is characterized by ENE directed convergence of the Nazca plate toward most of South America, and by ~. E-W subduction of the Antarctic plate beneath southern Patagonia. The Nazca-South America convergence rate in Stage 1 shows a continuous decrease from the highest values in the Cenozoic (~. 15. cm/yr) to the present day values from GPS measurements (~. 7. cm/yr). Stage 2 (47-28. Ma) is characterized by NE directed subduction of Farallon with the convergence rate remaining almost constant during the entire interval. In those times obliquity was dextral in Chile, sinistral in southern Peru, while almost head-on convergence occurred in central and northern Peru. During latest Cretaceous to Early Eocene times (Stage 3) the Farallon plate was subducted beneath Perú and the Phoenix plate was subducted farther south, where a triple junction migrated southward along the Chilean margin. The subduction of the Farallon plate was rather slow with variable direction imposed by the position of the triple junction, whereas subduction of the Phoenix plate was rapid (> 10. cm/yr) and ESE directed. We present a working hypothesis suggesting no major changes in the age of subducted lithosphere in the Chile trench from Middle Eocene to Late Oligocene, followed by subduction of progressively older oceanic lithosphere in the early Neogene and progressively younger lithosphere during the late Neogene and the Quaternary. In addition, it is shown that South American motion as predicted by available hotspot models has insufficient resolution to be applied to the analysis of Cenozoic Andean deformation. © 2012 Elsevier B.V. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ghidella, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v331-332_n_p152_Somoza http://hdl.handle.net/20.500.12110/paper_0012821X_v331-332_n_p152_Somoza
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Andes Cenozoic Convergence Late Cretaceous Andes Cenozoic Continental lithosphere Convergence Convergence rates Hot-spot model Late cretaceous Late Neogene Late Oligocene Nazca plate Neo genes Oceanic lithosphere Oceanic plate Patagonia Plate motions South America Triple junction Lithology Tectonics Andean orogeny Cenozoic continental lithosphere Cretaceous deformation hot spot Nazca plate oceanic lithosphere plate motion subduction trench triple junction Andes Chile Pacific Ocean Peru South America
spellingShingle	Andes Cenozoic Convergence Late Cretaceous Andes Cenozoic Continental lithosphere Convergence Convergence rates Hot-spot model Late cretaceous Late Neogene Late Oligocene Nazca plate Neo genes Oceanic lithosphere Oceanic plate Patagonia Plate motions South America Triple junction Lithology Tectonics Andean orogeny Cenozoic continental lithosphere Cretaceous deformation hot spot Nazca plate oceanic lithosphere plate motion subduction trench triple junction Andes Chile Pacific Ocean Peru South America Somoza, Ruben Ghidella, Marta Elba Late Cretaceous to recent plate motions in western South America revisited
topic_facet	Andes Cenozoic Convergence Late Cretaceous Andes Cenozoic Continental lithosphere Convergence Convergence rates Hot-spot model Late cretaceous Late Neogene Late Oligocene Nazca plate Neo genes Oceanic lithosphere Oceanic plate Patagonia Plate motions South America Triple junction Lithology Tectonics Andean orogeny Cenozoic continental lithosphere Cretaceous deformation hot spot Nazca plate oceanic lithosphere plate motion subduction trench triple junction Andes Chile Pacific Ocean Peru South America
description	The Andean Cordillera has evolved since the Late Cretaceous in the context of subduction of oceanic lithosphere beneath continental lithosphere, making the kinematics between South America and its adjacent oceanic plates in the Pacific basin valuable to analyze the development of the Andean orogen. The latest Cretaceous-Cenozoic convergence history in western South America may be divided into three stages. The youngest Stage 1 (25-0. Ma) is characterized by ENE directed convergence of the Nazca plate toward most of South America, and by ~. E-W subduction of the Antarctic plate beneath southern Patagonia. The Nazca-South America convergence rate in Stage 1 shows a continuous decrease from the highest values in the Cenozoic (~. 15. cm/yr) to the present day values from GPS measurements (~. 7. cm/yr). Stage 2 (47-28. Ma) is characterized by NE directed subduction of Farallon with the convergence rate remaining almost constant during the entire interval. In those times obliquity was dextral in Chile, sinistral in southern Peru, while almost head-on convergence occurred in central and northern Peru. During latest Cretaceous to Early Eocene times (Stage 3) the Farallon plate was subducted beneath Perú and the Phoenix plate was subducted farther south, where a triple junction migrated southward along the Chilean margin. The subduction of the Farallon plate was rather slow with variable direction imposed by the position of the triple junction, whereas subduction of the Phoenix plate was rapid (> 10. cm/yr) and ESE directed. We present a working hypothesis suggesting no major changes in the age of subducted lithosphere in the Chile trench from Middle Eocene to Late Oligocene, followed by subduction of progressively older oceanic lithosphere in the early Neogene and progressively younger lithosphere during the late Neogene and the Quaternary. In addition, it is shown that South American motion as predicted by available hotspot models has insufficient resolution to be applied to the analysis of Cenozoic Andean deformation. © 2012 Elsevier B.V.
author	Somoza, Ruben Ghidella, Marta Elba
author_facet	Somoza, Ruben Ghidella, Marta Elba
author_sort	Somoza, Ruben
title	Late Cretaceous to recent plate motions in western South America revisited
title_short	Late Cretaceous to recent plate motions in western South America revisited
title_full	Late Cretaceous to recent plate motions in western South America revisited
title_fullStr	Late Cretaceous to recent plate motions in western South America revisited
title_full_unstemmed	Late Cretaceous to recent plate motions in western South America revisited
title_sort	late cretaceous to recent plate motions in western south america revisited
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v331-332_n_p152_Somoza http://hdl.handle.net/20.500.12110/paper_0012821X_v331-332_n_p152_Somoza
work_keys_str_mv	AT somozaruben latecretaceoustorecentplatemotionsinwesternsouthamericarevisited AT ghidellamartaelba latecretaceoustorecentplatemotionsinwesternsouthamericarevisited
_version_	1768543259485798400

Late Cretaceous to recent plate motions in western South America revisited

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