The tectonic regime along the Andes: Present-day and Mesozoic regimes

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The analyses of the main parameters controlling the present Chile-type and Marianas-type tectonic settings developed along the eastern Pacific region show four different tectonic regimes: (1) a nearly neutral regime in the Oregon subduction zone; (2) major extensional regimes as the Nicaragua subduc...

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Autor principal:	Ramos, V.A.
Formato:	JOUR
Materias:	Absolute motion Back-arc basin Compression Extension Foreland basin Magmatic arc backarc basin deformation extensional tectonics foreland basin Mesozoic plate convergence plate motion plate tectonics subduction zone tectonic setting Andes
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00721050_v45_n1_p2_Ramos
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00721050_v45_n1_p2_Ramos
record_format	dspace
spelling	todo:paper_00721050_v45_n1_p2_Ramos2023-10-03T14:53:18Z The tectonic regime along the Andes: Present-day and Mesozoic regimes Ramos, V.A. Absolute motion Back-arc basin Compression Extension Foreland basin Magmatic arc backarc basin deformation extensional tectonics foreland basin Mesozoic plate convergence plate motion plate tectonics subduction zone tectonic setting Andes The analyses of the main parameters controlling the present Chile-type and Marianas-type tectonic settings developed along the eastern Pacific region show four different tectonic regimes: (1) a nearly neutral regime in the Oregon subduction zone; (2) major extensional regimes as the Nicaragua subduction zone developed in continental crust; (3) a Marianas setting in the Sandwich subduction zone with ocean floored back-arc basin with a unique west-dipping subduction zone and (4) the classic and dominant Chile-type under compression. The magmatic, structural and sedimentary behaviours of these four settings are discussed to understand the past tectonic regimes in the Mesozoic Andes based on their present geological and tectonic characteristics. The evaluation of the different parameters that governed the past and present tectonic regimes indicates that absolute motion of the upper plate relative to the hotspot frame and the consequent trench roll-back velocity are the first order parameters that control the deformation. Locally, the influences of the trench fill, linked to the dominant climate in the forearc, and the age of the subducted oceanic crust, have secondary roles. Ridge collisions of seismic and seismic oceanic ridges as well as fracture zone collisions have also a local outcome, and may produce an increase in coupling that reinforces compressional deformation. Local strain variations in the past and present Andes are not related with changes in the relative convergence rate, which is less important than the absolute motion relative to the Pacific hotspot frame, or changes in the thermal state of the upper plate. Changes in the slab dip, mainly those linked to steepening subduction zones, produce significant variations in the thermal state, that are important to generate extreme deformation in the foreland. © 2009 John Wiley & Sons, Ltd. Fil:Ramos, V.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_00721050_v45_n1_p2_Ramos
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Absolute motion Back-arc basin Compression Extension Foreland basin Magmatic arc backarc basin deformation extensional tectonics foreland basin Mesozoic plate convergence plate motion plate tectonics subduction zone tectonic setting Andes
spellingShingle	Absolute motion Back-arc basin Compression Extension Foreland basin Magmatic arc backarc basin deformation extensional tectonics foreland basin Mesozoic plate convergence plate motion plate tectonics subduction zone tectonic setting Andes Ramos, V.A. The tectonic regime along the Andes: Present-day and Mesozoic regimes
topic_facet	Absolute motion Back-arc basin Compression Extension Foreland basin Magmatic arc backarc basin deformation extensional tectonics foreland basin Mesozoic plate convergence plate motion plate tectonics subduction zone tectonic setting Andes
description	The analyses of the main parameters controlling the present Chile-type and Marianas-type tectonic settings developed along the eastern Pacific region show four different tectonic regimes: (1) a nearly neutral regime in the Oregon subduction zone; (2) major extensional regimes as the Nicaragua subduction zone developed in continental crust; (3) a Marianas setting in the Sandwich subduction zone with ocean floored back-arc basin with a unique west-dipping subduction zone and (4) the classic and dominant Chile-type under compression. The magmatic, structural and sedimentary behaviours of these four settings are discussed to understand the past tectonic regimes in the Mesozoic Andes based on their present geological and tectonic characteristics. The evaluation of the different parameters that governed the past and present tectonic regimes indicates that absolute motion of the upper plate relative to the hotspot frame and the consequent trench roll-back velocity are the first order parameters that control the deformation. Locally, the influences of the trench fill, linked to the dominant climate in the forearc, and the age of the subducted oceanic crust, have secondary roles. Ridge collisions of seismic and seismic oceanic ridges as well as fracture zone collisions have also a local outcome, and may produce an increase in coupling that reinforces compressional deformation. Local strain variations in the past and present Andes are not related with changes in the relative convergence rate, which is less important than the absolute motion relative to the Pacific hotspot frame, or changes in the thermal state of the upper plate. Changes in the slab dip, mainly those linked to steepening subduction zones, produce significant variations in the thermal state, that are important to generate extreme deformation in the foreland. © 2009 John Wiley & Sons, Ltd.
format	JOUR
author	Ramos, V.A.
author_facet	Ramos, V.A.
author_sort	Ramos, V.A.
title	The tectonic regime along the Andes: Present-day and Mesozoic regimes
title_short	The tectonic regime along the Andes: Present-day and Mesozoic regimes
title_full	The tectonic regime along the Andes: Present-day and Mesozoic regimes
title_fullStr	The tectonic regime along the Andes: Present-day and Mesozoic regimes
title_full_unstemmed	The tectonic regime along the Andes: Present-day and Mesozoic regimes
title_sort	tectonic regime along the andes: present-day and mesozoic regimes
url	http://hdl.handle.net/20.500.12110/paper_00721050_v45_n1_p2_Ramos
work_keys_str_mv	AT ramosva thetectonicregimealongtheandespresentdayandmesozoicregimes AT ramosva tectonicregimealongtheandespresentdayandmesozoicregimes
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The tectonic regime along the Andes: Present-day and Mesozoic regimes

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