Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system

We investigated the temporal evolution of the andesitic Chimpa volcano of the northern Puna plateau, Central Andes, situated at the geological boundary between the plateau and the Eastern Cordillera domains. The volcanic activity consisted in three constructive volcanic cycles (Basal, Cajon, and Chi...

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Autores: Bustos, Emilce, Bardelli, Lorenzo, Arnosio, Marcelo, Becchio, Raul Alberto
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/230442
Acceso en línea:http://hdl.handle.net/11336/230442
Access Level:acceso abierto
Palabra clave:PUNA PLATEAU
STEADY-STATE MAGMATISM
ZIRCON TH/U
ZIRCON U-PB AGES
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
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oai_identifier_str oai:ri.conicet.gov.ar:11336/230442
network_acronym_str AR
network_name_str Argentina
repository_id_str
dc.title.none.fl_str_mv Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
title Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
spellingShingle Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
Bustos, Emilce
PUNA PLATEAU
STEADY-STATE MAGMATISM
ZIRCON TH/U
ZIRCON U-PB AGES
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
title_short Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
title_full Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
title_fullStr Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
title_full_unstemmed Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
title_sort Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system
dc.creator.none.fl_str_mv Bustos, Emilce
Bardelli, Lorenzo
Arnosio, Marcelo
Becchio, Raul Alberto
author Bustos, Emilce
author_facet Bustos, Emilce
Bardelli, Lorenzo
Arnosio, Marcelo
Becchio, Raul Alberto
author_role author
author2 Bardelli, Lorenzo
Arnosio, Marcelo
Becchio, Raul Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv PUNA PLATEAU
STEADY-STATE MAGMATISM
ZIRCON TH/U
ZIRCON U-PB AGES
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
topic PUNA PLATEAU
STEADY-STATE MAGMATISM
ZIRCON TH/U
ZIRCON U-PB AGES
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
description We investigated the temporal evolution of the andesitic Chimpa volcano of the northern Puna plateau, Central Andes, situated at the geological boundary between the plateau and the Eastern Cordillera domains. The volcanic activity consisted in three constructive volcanic cycles (Basal, Cajon, and Chimpa units) showing complex eruptive behaviors (ignimbrites, lava domes. block-and-ash flows, lava flows). We present new U-Pb analyses conducted on the zircon crystals from the Chimpa volcanic rocks. These analyses provide constraints on the magmatic/volcanic tempos and offer insights into the Th and U (and Th/U ratios) systematics of the analyzed zircon crystals. The results suggest a lifespan for volcanism ranging 7.5 to <7.0 Ma, in concomitance with the regional steady-state magmatic phase separating the first two pulses of ignimbritic flare-up in the Altiplano-Puna Volcanic Complex. Moreover, the analyzed zircon crystals exhibit Th/U ratios (0.11-0.34) and Th (33-8860 ppm) and U (52-4258 ppm) that indicate magmatic crystallization from poorly evolved melts at high temperatures. Some discrepancies exist between the calculated zircon concordia age for the third volcanic phase (Chimpa Unit, ca. 7.35 ± 0.071 Ma) and that of the second cycle (Cajon Unit, 6.98 ± 0.057 Ma). We interpret these differences as stemming from the presence of zircon antecrysts in the final eruptive melts. Indeed, a true pre-eruptive event of zircon crystallization (i.e., formation of autocrysts) could not be proven by the existing dataset.There is a geochronological affinity with some nearby volcanic rocks from the Puna plateau and the Eastern Cordillera domains, particularly considering the rhyolitic products of the Ramadas Volcanic Center and the andesitic to dacitic Almagro volcanic rocks. This highlights the complex behavior of the local magma plumbing system beneath this particular area, resulting in the emission of geochemically variegate volcanic rocks at similar times. This scenario suggests that the composition of the erupting melts are affected by the rheological behavior of the mid-upper-crustal MASH reservoir (the Altiplano-Puna Magmatic Body), which may either facilitate or impede the ascent of poorly evolved magmas derived from the deep crust towards the surface. From this point of view, the relative location of the volcanic centers relatively to the position of the geophysical anomaly may exert an important influence on the petrogenetic paths of magmas.
publishDate 2023
dc.date.none.fl_str_mv 2023-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/230442
Bustos, Emilce; Bardelli, Lorenzo; Arnosio, Marcelo; Becchio, Raul Alberto; Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system; Elsevier; Geosystems and Geoenvironment; 3; 1; 10-2023; 1-39
2772-8838
CONICET Digital
CONICET
url http://hdl.handle.net/11336/230442
identifier_str_mv Bustos, Emilce; Bardelli, Lorenzo; Arnosio, Marcelo; Becchio, Raul Alberto; Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system; Elsevier; Geosystems and Geoenvironment; 3; 1; 10-2023; 1-39
2772-8838
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S2772883823000602
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geogeo.2023.100237
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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spelling Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic systemBustos, EmilceBardelli, LorenzoArnosio, MarceloBecchio, Raul AlbertoPUNA PLATEAUSTEADY-STATE MAGMATISMZIRCON TH/UZIRCON U-PB AGEShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We investigated the temporal evolution of the andesitic Chimpa volcano of the northern Puna plateau, Central Andes, situated at the geological boundary between the plateau and the Eastern Cordillera domains. The volcanic activity consisted in three constructive volcanic cycles (Basal, Cajon, and Chimpa units) showing complex eruptive behaviors (ignimbrites, lava domes. block-and-ash flows, lava flows). We present new U-Pb analyses conducted on the zircon crystals from the Chimpa volcanic rocks. These analyses provide constraints on the magmatic/volcanic tempos and offer insights into the Th and U (and Th/U ratios) systematics of the analyzed zircon crystals. The results suggest a lifespan for volcanism ranging 7.5 to <7.0 Ma, in concomitance with the regional steady-state magmatic phase separating the first two pulses of ignimbritic flare-up in the Altiplano-Puna Volcanic Complex. Moreover, the analyzed zircon crystals exhibit Th/U ratios (0.11-0.34) and Th (33-8860 ppm) and U (52-4258 ppm) that indicate magmatic crystallization from poorly evolved melts at high temperatures. Some discrepancies exist between the calculated zircon concordia age for the third volcanic phase (Chimpa Unit, ca. 7.35 ± 0.071 Ma) and that of the second cycle (Cajon Unit, 6.98 ± 0.057 Ma). We interpret these differences as stemming from the presence of zircon antecrysts in the final eruptive melts. Indeed, a true pre-eruptive event of zircon crystallization (i.e., formation of autocrysts) could not be proven by the existing dataset.There is a geochronological affinity with some nearby volcanic rocks from the Puna plateau and the Eastern Cordillera domains, particularly considering the rhyolitic products of the Ramadas Volcanic Center and the andesitic to dacitic Almagro volcanic rocks. This highlights the complex behavior of the local magma plumbing system beneath this particular area, resulting in the emission of geochemically variegate volcanic rocks at similar times. This scenario suggests that the composition of the erupting melts are affected by the rheological behavior of the mid-upper-crustal MASH reservoir (the Altiplano-Puna Magmatic Body), which may either facilitate or impede the ascent of poorly evolved magmas derived from the deep crust towards the surface. From this point of view, the relative location of the volcanic centers relatively to the position of the geophysical anomaly may exert an important influence on the petrogenetic paths of magmas.Fil: Bustos, Emilce. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; ArgentinaFil: Bardelli, Lorenzo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; ArgentinaFil: Arnosio, Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; ArgentinaFil: Becchio, Raul Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; ArgentinaElsevier2023-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/230442Bustos, Emilce; Bardelli, Lorenzo; Arnosio, Marcelo; Becchio, Raul Alberto; Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system; Elsevier; Geosystems and Geoenvironment; 3; 1; 10-2023; 1-392772-8838CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S2772883823000602info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geogeo.2023.100237info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T13:52:55Zoai:ri.conicet.gov.ar:11336/230442instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982024-05-08 13:52:55.38CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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