The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes
The late Ediacaran to early Cambrian Pampean magmatic arc in Argentina represents an excellent example of subduction-related magmatism and continental crust formation. This study presents new geochemical, isotopic, and geochronological data from the Guasayán intrusive complex, which is a significant...
| Autores: | , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/126436 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/126436 |
| Access Level: | acceso abierto |
| Palabra clave: | 552.3(82) Continental arc magmatism Pampean orogen Granite petrogenesis Hybridization Puncoviscana Series Petrología 2506.13 Petrología Ignea y Metamórfica |
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The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processesZandomeni, Priscila S.MorenoMoreno Moreno, Juan AntonioMorales Cámera, Matías M.Verdecchia, SebastiánBaldo, Edgardo G.Dahlquist, Juan A.Casquet Martín, CésarBasei, Miguel A.S.Santos da Cruz, GilmaraRapela, Carlos W.552.3(82)Continental arc magmatismPampean orogenGranite petrogenesisHybridizationPuncoviscana SeriesPetrología2506.13 Petrología Ignea y MetamórficaThe late Ediacaran to early Cambrian Pampean magmatic arc in Argentina represents an excellent example of subduction-related magmatism and continental crust formation. This study presents new geochemical, isotopic, and geochronological data from the Guasayán intrusive complex, which is a significant body within this magmatic arc. The data are integrated with a comprehensive compilation of published data from the arc elsewhere. The Pampean arc exhibits a wide range of rocks, from metaluminous I-type diorites to strongly peraluminous S-type granites, with the majority displaying hybrid compositions (mostly magnesian, calc-alkalic and slightly peraluminous compositions). Zircon U-Pb geochronology indicates that the Guasayán granitoids were emplaced mainly during a flare-up of arc magmatism between ca. 530 and 535 Ma. However, the presence of zircon antecrysts with ages of ca. 545 Ma in most of the Pampean arc granitoids, suggests that the magmatic system was long-lived, and the early crystallized zircon crystals were recycled into younger magmatic pulses. Geochemical and isotope data (Sr-Nd-Hf) highlight the interaction between mantle-derived magmas and crustal components, with magma mixing identified as the dominant process in the generation of the hybrid granitoids. Local-scale processes such as crustal assimilation, fractional crystallization, and peritectic entrainment also contributed to the geochemical and isotopic diversity. The involvement of the Puncoviscana Series as the crustal component of the mixed magmas is evidenced by zircon inheritance patterns and isotopic signatures. This study underscores the importance of magma mixing in the evolution of the Pampean arc and provides insights into the geodynamic processes driving continental crust formation in subduction-related settings.ElsevierUniversidad Complutense de Madrid20262026-02-0120262026-02-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/126436reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1264362026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| title |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| spellingShingle |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes Zandomeni, Priscila S. 552.3(82) Continental arc magmatism Pampean orogen Granite petrogenesis Hybridization Puncoviscana Series Petrología 2506.13 Petrología Ignea y Metamórfica |
| title_short |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| title_full |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| title_fullStr |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| title_full_unstemmed |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| title_sort |
The late Ediacaran to early Cambrian subduction-related granitic magmatism of the Pampean orogen: Geochemical and isotopic constraints on hybridization processes |
| dc.creator.none.fl_str_mv |
Zandomeni, Priscila S. Moreno Moreno Moreno, Juan Antonio Morales Cámera, Matías M. Verdecchia, Sebastián Baldo, Edgardo G. Dahlquist, Juan A. Casquet Martín, César Basei, Miguel A.S. Santos da Cruz, Gilmara Rapela, Carlos W. |
| author |
Zandomeni, Priscila S. |
| author_facet |
Zandomeni, Priscila S. Moreno Moreno Moreno, Juan Antonio Morales Cámera, Matías M. Verdecchia, Sebastián Baldo, Edgardo G. Dahlquist, Juan A. Casquet Martín, César Basei, Miguel A.S. Santos da Cruz, Gilmara Rapela, Carlos W. |
| author_role |
author |
| author2 |
Moreno Moreno Moreno, Juan Antonio Morales Cámera, Matías M. Verdecchia, Sebastián Baldo, Edgardo G. Dahlquist, Juan A. Casquet Martín, César Basei, Miguel A.S. Santos da Cruz, Gilmara Rapela, Carlos W. |
| author2_role |
author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
552.3(82) Continental arc magmatism Pampean orogen Granite petrogenesis Hybridization Puncoviscana Series Petrología 2506.13 Petrología Ignea y Metamórfica |
| topic |
552.3(82) Continental arc magmatism Pampean orogen Granite petrogenesis Hybridization Puncoviscana Series Petrología 2506.13 Petrología Ignea y Metamórfica |
| description |
The late Ediacaran to early Cambrian Pampean magmatic arc in Argentina represents an excellent example of subduction-related magmatism and continental crust formation. This study presents new geochemical, isotopic, and geochronological data from the Guasayán intrusive complex, which is a significant body within this magmatic arc. The data are integrated with a comprehensive compilation of published data from the arc elsewhere. The Pampean arc exhibits a wide range of rocks, from metaluminous I-type diorites to strongly peraluminous S-type granites, with the majority displaying hybrid compositions (mostly magnesian, calc-alkalic and slightly peraluminous compositions). Zircon U-Pb geochronology indicates that the Guasayán granitoids were emplaced mainly during a flare-up of arc magmatism between ca. 530 and 535 Ma. However, the presence of zircon antecrysts with ages of ca. 545 Ma in most of the Pampean arc granitoids, suggests that the magmatic system was long-lived, and the early crystallized zircon crystals were recycled into younger magmatic pulses. Geochemical and isotope data (Sr-Nd-Hf) highlight the interaction between mantle-derived magmas and crustal components, with magma mixing identified as the dominant process in the generation of the hybrid granitoids. Local-scale processes such as crustal assimilation, fractional crystallization, and peritectic entrainment also contributed to the geochemical and isotopic diversity. The involvement of the Puncoviscana Series as the crustal component of the mixed magmas is evidenced by zircon inheritance patterns and isotopic signatures. This study underscores the importance of magma mixing in the evolution of the Pampean arc and provides insights into the geodynamic processes driving continental crust formation in subduction-related settings. |
| publishDate |
2026 |
| dc.date.none.fl_str_mv |
2026 2026-02-01 2026 2026-02-01 |
| dc.type.none.fl_str_mv |
journal 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://hdl.handle.net/20.500.14352/126436 |
| url |
https://hdl.handle.net/20.500.14352/126436 |
| 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 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
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openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
Elsevier |
| publisher.none.fl_str_mv |
Elsevier |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
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Universidad Complutense de Madrid (UCM) |
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Docta Complutense |
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Docta Complutense |
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