Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia

We use U-Th/(He) zircon and apatite thermochronology and Al in hornblende geobarometry from Eocene granitoids of the Sierra Nevada de Santa Marta and Guajira uplifted massifs in northern Colombia to elucidate the exhumation history of the northern South America continental margin and its bearing to...

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Autores: Cardona, Agustín, Valencia, Victor A., Weber, Marion|||0000-0002-4071-6877, Duque Trujillo, Jose|||0000-0003-1231-6013, Montes, Camilo|||0000-0002-3553-0787, Ojeda, Gina, Reiners, Peter W., Domanik, Kenneth J., Nicolescu, Stefan, Villagomez, Diego|||0000-0002-7421-9975
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:89056
Acceso en línea:https://ddd.uab.cat/record/89056
https://dx.doi.org/urn:doi:10.1344/105.000001739
Access Level:acceso abierto
Palabra clave:U-Th/He thermochronology
Exhumation
Oblique convergence
Caribbean subduction
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spelling Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern ColombiaCardona, AgustínValencia, Victor A.Weber, Marion|||0000-0002-4071-6877Duque Trujillo, Jose|||0000-0003-1231-6013Montes, Camilo|||0000-0002-3553-0787Ojeda, GinaReiners, Peter W.Domanik, Kenneth J.Nicolescu, StefanVillagomez, Diego|||0000-0002-7421-9975U-Th/He thermochronologyExhumationOblique convergenceCaribbean subductionWe use U-Th/(He) zircon and apatite thermochronology and Al in hornblende geobarometry from Eocene granitoids of the Sierra Nevada de Santa Marta and Guajira uplifted massifs in northern Colombia to elucidate the exhumation history of the northern South America continental margin and its bearing to Cenozoic Caribbean- South American plate interactions. Aluminium in hornblende geobarometry from the Eocene Santa Marta batholith yields pressures between 4.9±0.6kbar and 6.4±0.6kbar, which indicate that at least, 14.7-19.2km of unroofing took place since 56-50Ma in the northwestern Sierra Nevada de Santa Marta. In the Guajira Peninsula, calculated pressures for the Eocene Parashi stock are 2.3±0.6kbar and 3±0.6kbar. Stratigraphic considerations pertaining to Oligocene conglomerates from the Guajira area suggest that 6.9-9km of crust was lost between 50Ma and ca. 26Ma. U-Th/He zircon and apatite thermochronology from granitoids in the Sierra Nevada de Santa Marta shows the existence of major exhumation events in the Late Eocene (ca. 45-40Ma), Late Oligocene (ca. 25Ma) and Miocene (ca. 15Ma). The Guajira region records the Late Eocene to Early Oligocene (35-25Ma) event, but it lacks evidence for the Miocene exhumation phase. These differences reflect isolation of the Guajira region from the Sierra Nevada de Santa Marta and the Andean chain due to extensive block rotation and transtensional tectonics that affected the region during post-Eocene times. The post-Eocene events correlate in time with an increased convergence rate and the frontal approach of North and South America. It is suggested that the two major tectonic mechanisms that govern exhumation in these Caribbean massifs are: 1) subduction of the Caribbean plate, and 2) post Eocene changes in plate convergence obliquity and rates that caused the South American continental margin blocks to override the Caribbean plate. Temporal correlation with other Caribbean and Northern Andean events allows to resolve the regional Cenozoic plate tectonic reorganizations experienced by the South American, Caribbean and Pacific plates at a regional scale. 22011-01-0120112011-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/89056https://dx.doi.org/urn:doi:10.1344/105.000001739reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:890562026-06-06T12:50:31Z
dc.title.none.fl_str_mv Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
title Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
spellingShingle Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
Cardona, Agustín
U-Th/He thermochronology
Exhumation
Oblique convergence
Caribbean subduction
title_short Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
title_full Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
title_fullStr Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
title_full_unstemmed Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
title_sort Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate : U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia
dc.creator.none.fl_str_mv Cardona, Agustín
Valencia, Victor A.
Weber, Marion|||0000-0002-4071-6877
Duque Trujillo, Jose|||0000-0003-1231-6013
Montes, Camilo|||0000-0002-3553-0787
Ojeda, Gina
Reiners, Peter W.
Domanik, Kenneth J.
Nicolescu, Stefan
Villagomez, Diego|||0000-0002-7421-9975
author Cardona, Agustín
author_facet Cardona, Agustín
Valencia, Victor A.
Weber, Marion|||0000-0002-4071-6877
Duque Trujillo, Jose|||0000-0003-1231-6013
Montes, Camilo|||0000-0002-3553-0787
Ojeda, Gina
Reiners, Peter W.
Domanik, Kenneth J.
Nicolescu, Stefan
Villagomez, Diego|||0000-0002-7421-9975
author_role author
author2 Valencia, Victor A.
Weber, Marion|||0000-0002-4071-6877
Duque Trujillo, Jose|||0000-0003-1231-6013
Montes, Camilo|||0000-0002-3553-0787
Ojeda, Gina
Reiners, Peter W.
Domanik, Kenneth J.
Nicolescu, Stefan
Villagomez, Diego|||0000-0002-7421-9975
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv U-Th/He thermochronology
Exhumation
Oblique convergence
Caribbean subduction
topic U-Th/He thermochronology
Exhumation
Oblique convergence
Caribbean subduction
description We use U-Th/(He) zircon and apatite thermochronology and Al in hornblende geobarometry from Eocene granitoids of the Sierra Nevada de Santa Marta and Guajira uplifted massifs in northern Colombia to elucidate the exhumation history of the northern South America continental margin and its bearing to Cenozoic Caribbean- South American plate interactions. Aluminium in hornblende geobarometry from the Eocene Santa Marta batholith yields pressures between 4.9±0.6kbar and 6.4±0.6kbar, which indicate that at least, 14.7-19.2km of unroofing took place since 56-50Ma in the northwestern Sierra Nevada de Santa Marta. In the Guajira Peninsula, calculated pressures for the Eocene Parashi stock are 2.3±0.6kbar and 3±0.6kbar. Stratigraphic considerations pertaining to Oligocene conglomerates from the Guajira area suggest that 6.9-9km of crust was lost between 50Ma and ca. 26Ma. U-Th/He zircon and apatite thermochronology from granitoids in the Sierra Nevada de Santa Marta shows the existence of major exhumation events in the Late Eocene (ca. 45-40Ma), Late Oligocene (ca. 25Ma) and Miocene (ca. 15Ma). The Guajira region records the Late Eocene to Early Oligocene (35-25Ma) event, but it lacks evidence for the Miocene exhumation phase. These differences reflect isolation of the Guajira region from the Sierra Nevada de Santa Marta and the Andean chain due to extensive block rotation and transtensional tectonics that affected the region during post-Eocene times. The post-Eocene events correlate in time with an increased convergence rate and the frontal approach of North and South America. It is suggested that the two major tectonic mechanisms that govern exhumation in these Caribbean massifs are: 1) subduction of the Caribbean plate, and 2) post Eocene changes in plate convergence obliquity and rates that caused the South American continental margin blocks to override the Caribbean plate. Temporal correlation with other Caribbean and Northern Andean events allows to resolve the regional Cenozoic plate tectonic reorganizations experienced by the South American, Caribbean and Pacific plates at a regional scale.
publishDate 2011
dc.date.none.fl_str_mv 2
2011-01-01
2011
2011-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/89056
https://dx.doi.org/urn:doi:10.1344/105.000001739
url https://ddd.uab.cat/record/89056
https://dx.doi.org/urn:doi:10.1344/105.000001739
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/3.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/3.0/
eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
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