Why has the Nazca plate slowed since the Neogene?

The classic example of the not-well-understood rapid change of tectonic plate motion is the increase and then decrease of the convergence rate between the Nazca and South America plates during the past 25-20 m.y. that coincided with the growth of the Andes Mountains. Currently, the decrease in conve...

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Autores principales: Quinteros, J., Sobolev, S.V.
Formato: JOUR
Materias:
Convergence rates
Lower mantle
Natural consequences
Nazca plate
Neo genes
Oblique subduction
Seismic tomographic images
South America
Tectonic plates
Thermo-mechanical
Transition zones
View-based
Geology
Tomography
Neogene
plate motion
seismic tomography
subduction zone
transition zone
Andes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00917613_v41_n1_p31_Quinteros
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00917613_v41_n1_p31_Quinteros
record_format dspace
spelling todo:paper_00917613_v41_n1_p31_Quinteros2023-10-03T14:55:07Z Why has the Nazca plate slowed since the Neogene? Quinteros, J. Sobolev, S.V. Convergence rates Lower mantle Natural consequences Nazca plate Neo genes Oblique subduction Seismic tomographic images South America Tectonic plates Thermo-mechanical Transition zones View-based Geology Tomography Nazca plate Neogene plate motion seismic tomography subduction zone transition zone Andes The classic example of the not-well-understood rapid change of tectonic plate motion is the increase and then decrease of the convergence rate between the Nazca and South America plates during the past 25-20 m.y. that coincided with the growth of the Andes Mountains. Currently, the decrease in convergence rate is explained either by the increasing load of the Andes or by the appearance of fl at slab segments beneath South America. Here, we present an alternative view based on a thermomechanical self-consistent (gravity driven) model of Nazca plate subduction. We explain the changes in the convergence rate as a natural consequence of the Nazca plate penetration into the transition zone and lower mantle after long-term oblique subduction of the Farallon plate. The model is consistent with seismic tomographic images of the Nazca plate beneath South America. Our model also shows that the presence of the Andes does not signifi cantly affect the convergence rate between the Nazca and South America plates. © 2012 Geological Society of America. Fil:Quinteros, J. 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_00917613_v41_n1_p31_Quinteros
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Convergence rates
Lower mantle
Natural consequences
Nazca plate
Neo genes
Oblique subduction
Seismic tomographic images
South America
Tectonic plates
Thermo-mechanical
Transition zones
View-based
Geology
Tomography
Nazca plate
Neogene
plate motion
seismic tomography
subduction zone
transition zone
Andes
spellingShingle Convergence rates
Lower mantle
Natural consequences
Nazca plate
Neo genes
Oblique subduction
Seismic tomographic images
South America
Tectonic plates
Thermo-mechanical
Transition zones
View-based
Geology
Tomography
Nazca plate
Neogene
plate motion
seismic tomography
subduction zone
transition zone
Andes
Quinteros, J.
Sobolev, S.V.
Why has the Nazca plate slowed since the Neogene?
topic_facet Convergence rates
Lower mantle
Natural consequences
Nazca plate
Neo genes
Oblique subduction
Seismic tomographic images
South America
Tectonic plates
Thermo-mechanical
Transition zones
View-based
Geology
Tomography
Nazca plate
Neogene
plate motion
seismic tomography
subduction zone
transition zone
Andes
description The classic example of the not-well-understood rapid change of tectonic plate motion is the increase and then decrease of the convergence rate between the Nazca and South America plates during the past 25-20 m.y. that coincided with the growth of the Andes Mountains. Currently, the decrease in convergence rate is explained either by the increasing load of the Andes or by the appearance of fl at slab segments beneath South America. Here, we present an alternative view based on a thermomechanical self-consistent (gravity driven) model of Nazca plate subduction. We explain the changes in the convergence rate as a natural consequence of the Nazca plate penetration into the transition zone and lower mantle after long-term oblique subduction of the Farallon plate. The model is consistent with seismic tomographic images of the Nazca plate beneath South America. Our model also shows that the presence of the Andes does not signifi cantly affect the convergence rate between the Nazca and South America plates. © 2012 Geological Society of America.
format JOUR
author Quinteros, J.
Sobolev, S.V.
author_facet Quinteros, J.
Sobolev, S.V.
author_sort Quinteros, J.
title Why has the Nazca plate slowed since the Neogene?
title_short Why has the Nazca plate slowed since the Neogene?
title_full Why has the Nazca plate slowed since the Neogene?
title_fullStr Why has the Nazca plate slowed since the Neogene?
title_full_unstemmed Why has the Nazca plate slowed since the Neogene?
title_sort why has the nazca plate slowed since the neogene?
url http://hdl.handle.net/20.500.12110/paper_00917613_v41_n1_p31_Quinteros
work_keys_str_mv AT quinterosj whyhasthenazcaplateslowedsincetheneogene
AT sobolevsv whyhasthenazcaplateslowedsincetheneogene
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