Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S

Autores
Pedraza De Marchi, Ana Carolina; Ghidella, Marta E.; Tocho, Claudia Noemí; Franzese, Juan Rafael
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Magmatic underplating can be defined as the addition of mafic magma to the lower crust and uppermost mantle around the Moho. This phenomenon plays an important role in continental margins and other compressional and extensional tectonic environments. We have modeled the magmatic underplating effect using Process-Oriented Gravity Modeling (POGM) along a profile at 43.5°S on the Argentine continental margin, which re-thickens the crust and causes uplift. In POGM, the gravity anomaly is formed by the rift, sedimentation, and magmatic underplating anomaly. This work focuses on the flexural uplift produced by the magmatic underplating and its gravity anomaly, rarely investigated in margins since seismic refraction data is generally unavailable to the scientific community. Particularly, it has not been calculated in the volcanic sector of the Argentine continental margin before this work. The results yield an average maximum flexural uplift associated with magmatic underplating, which is um = 140.32 m ± 22.12 m, an average density of the underplated body of ρx = 3133.89 kg/m3 ± 22.71 kg/m3, and an average density of the sediment ρs = 2207.78 kg/m3 ± 42.58 kg/m3 and an average oceanic crustal thickness of 6.36 km. The average elastic thickness leaving out the magmatic underplating effect is Te = 24 km ± 2.02 km, and including it is Te = 33.89 km ± 2.35 km. The magmatic underplating anomaly has an opposite contribution to the typical free-air gravity edge-effect for the Airy and flexural cases.
Centro de Investigaciones Geológicas
Facultad de Ciencias Astronómicas y Geofísicas
Facultad de Ciencias Naturales y Museo
Materia
Geofísica
Astronomía
Ciencias Naturales
Magmatic underplating
Process-Oriented Gravity Modeling
Flexural uplift
Argentine continental margin
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/137915
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/137915
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°SPedraza De Marchi, Ana CarolinaGhidella, Marta E.Tocho, Claudia NoemíFranzese, Juan RafaelGeofísicaAstronomíaCiencias NaturalesMagmatic underplatingProcess-Oriented Gravity ModelingFlexural upliftArgentine continental marginMagmatic underplating can be defined as the addition of mafic magma to the lower crust and uppermost mantle around the Moho. This phenomenon plays an important role in continental margins and other compressional and extensional tectonic environments. We have modeled the magmatic underplating effect using Process-Oriented Gravity Modeling (POGM) along a profile at 43.5°S on the Argentine continental margin, which re-thickens the crust and causes uplift. In POGM, the gravity anomaly is formed by the rift, sedimentation, and magmatic underplating anomaly. This work focuses on the flexural uplift produced by the magmatic underplating and its gravity anomaly, rarely investigated in margins since seismic refraction data is generally unavailable to the scientific community. Particularly, it has not been calculated in the volcanic sector of the Argentine continental margin before this work. The results yield an average maximum flexural uplift associated with magmatic underplating, which is um = 140.32 m ± 22.12 m, an average density of the underplated body of ρx = 3133.89 kg/m3 ± 22.71 kg/m3, and an average density of the sediment ρs = 2207.78 kg/m3 ± 42.58 kg/m3 and an average oceanic crustal thickness of 6.36 km. The average elastic thickness leaving out the magmatic underplating effect is Te = 24 km ± 2.02 km, and including it is Te = 33.89 km ± 2.35 km. The magmatic underplating anomaly has an opposite contribution to the typical free-air gravity edge-effect for the Airy and flexural cases.Centro de Investigaciones GeológicasFacultad de Ciencias Astronómicas y GeofísicasFacultad de Ciencias Naturales y Museo2021-05-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1-16http://sedici.unlp.edu.ar/handle/10915/137915enginfo:eu-repo/semantics/altIdentifier/issn/0025-3235info:eu-repo/semantics/altIdentifier/issn/1573-0581info:eu-repo/semantics/altIdentifier/doi/10.1007/s11001-021-09437-xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T11:23:42Zoai:sedici.unlp.edu.ar:10915/137915Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:23:43.188SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
title Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
spellingShingle Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
Pedraza De Marchi, Ana Carolina
Geofísica
Astronomía
Ciencias Naturales
Magmatic underplating
Process-Oriented Gravity Modeling
Flexural uplift
Argentine continental margin
title_short Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
title_full Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
title_fullStr Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
title_full_unstemmed Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
title_sort Flexural uplift and magmatic underplating anomaly on the Argentine continental margin: profile at 43.5°S
dc.creator.none.fl_str_mv Pedraza De Marchi, Ana Carolina
Ghidella, Marta E.
Tocho, Claudia Noemí
Franzese, Juan Rafael
author Pedraza De Marchi, Ana Carolina
author_facet Pedraza De Marchi, Ana Carolina
Ghidella, Marta E.
Tocho, Claudia Noemí
Franzese, Juan Rafael
author_role author
author2 Ghidella, Marta E.
Tocho, Claudia Noemí
Franzese, Juan Rafael
author2_role author
author
author
dc.subject.none.fl_str_mv Geofísica
Astronomía
Ciencias Naturales
Magmatic underplating
Process-Oriented Gravity Modeling
Flexural uplift
Argentine continental margin
topic Geofísica
Astronomía
Ciencias Naturales
Magmatic underplating
Process-Oriented Gravity Modeling
Flexural uplift
Argentine continental margin
dc.description.none.fl_txt_mv Magmatic underplating can be defined as the addition of mafic magma to the lower crust and uppermost mantle around the Moho. This phenomenon plays an important role in continental margins and other compressional and extensional tectonic environments. We have modeled the magmatic underplating effect using Process-Oriented Gravity Modeling (POGM) along a profile at 43.5°S on the Argentine continental margin, which re-thickens the crust and causes uplift. In POGM, the gravity anomaly is formed by the rift, sedimentation, and magmatic underplating anomaly. This work focuses on the flexural uplift produced by the magmatic underplating and its gravity anomaly, rarely investigated in margins since seismic refraction data is generally unavailable to the scientific community. Particularly, it has not been calculated in the volcanic sector of the Argentine continental margin before this work. The results yield an average maximum flexural uplift associated with magmatic underplating, which is um = 140.32 m ± 22.12 m, an average density of the underplated body of ρx = 3133.89 kg/m3 ± 22.71 kg/m3, and an average density of the sediment ρs = 2207.78 kg/m3 ± 42.58 kg/m3 and an average oceanic crustal thickness of 6.36 km. The average elastic thickness leaving out the magmatic underplating effect is Te = 24 km ± 2.02 km, and including it is Te = 33.89 km ± 2.35 km. The magmatic underplating anomaly has an opposite contribution to the typical free-air gravity edge-effect for the Airy and flexural cases.
Centro de Investigaciones Geológicas
Facultad de Ciencias Astronómicas y Geofísicas
Facultad de Ciencias Naturales y Museo
description Magmatic underplating can be defined as the addition of mafic magma to the lower crust and uppermost mantle around the Moho. This phenomenon plays an important role in continental margins and other compressional and extensional tectonic environments. We have modeled the magmatic underplating effect using Process-Oriented Gravity Modeling (POGM) along a profile at 43.5°S on the Argentine continental margin, which re-thickens the crust and causes uplift. In POGM, the gravity anomaly is formed by the rift, sedimentation, and magmatic underplating anomaly. This work focuses on the flexural uplift produced by the magmatic underplating and its gravity anomaly, rarely investigated in margins since seismic refraction data is generally unavailable to the scientific community. Particularly, it has not been calculated in the volcanic sector of the Argentine continental margin before this work. The results yield an average maximum flexural uplift associated with magmatic underplating, which is um = 140.32 m ± 22.12 m, an average density of the underplated body of ρx = 3133.89 kg/m3 ± 22.71 kg/m3, and an average density of the sediment ρs = 2207.78 kg/m3 ± 42.58 kg/m3 and an average oceanic crustal thickness of 6.36 km. The average elastic thickness leaving out the magmatic underplating effect is Te = 24 km ± 2.02 km, and including it is Te = 33.89 km ± 2.35 km. The magmatic underplating anomaly has an opposite contribution to the typical free-air gravity edge-effect for the Airy and flexural cases.
publishDate 2021
dc.date.none.fl_str_mv 2021-05-15
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/137915
url http://sedici.unlp.edu.ar/handle/10915/137915
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language eng
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info:eu-repo/semantics/altIdentifier/issn/1573-0581
info:eu-repo/semantics/altIdentifier/doi/10.1007/s11001-021-09437-x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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