Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina

Autores
Weinberg, Roberto; Ortiz Joya, Guillermo; Vernon, Ron; Araujo, Lucas; Morfulis Geipel, Marcos Nicolas; Sola, Alfonso Manuel; Suzaño, Nestor Omar; Becchio, Raul Alberto
Año de publicación
2026
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Arc magmas are rich in fluids that exsolve forming a volatile phase at some point during ascent and crystallization. Despite expectations that this phase could have a significant impact on the evolution of magma reservoirs, there is relatively little recorded evidence of this impact or even of their passage, other than the upper reaches of the chamber. We hypothesize that this mismatch could be due to a lack of recognition of possible magmatic structures associated with this process. Here, we use meso- and microstructures found in variably disrupted dioritic sills and dykes, forming microdioritic and microgranitic enclaves of a large range of sizes, to explore features that could record the passage of a volatile phase and to argue that its passage facilitated hybridization between the two magmas. We focus on structures formed in three plutons of the Early Paleozoic Famatinian Arc in Argentina.The diorites in these plutons are commonly heterogeneous at cm- to dm-scale and have open and filled miaroles, indicative of the presence of a volatile phase. These miaroles tend to form swarms in the heterogeneous rock that also has quartz ocelli and feldspars with rapakivi texture – features indicative of magma hybridization. These heterogeneous rocks are also associated with a number of curious magmatic structures that we speculate record degassing processes and facilitate hybridization by intensifying melt flow and reactivity between the magmas. These structures indicate that the volatile phase caused bubbly diapirs, gas-driven filter-pressing, local catastrophic transfer of crystals across magmatic contacts, and it likely facilitated pervasive flow of invading leucogranitic melt through the pore space of a mushy diorite. Despite the speculative nature of these conclusions, we argue that there is a range of magmatic structures that remain unexplained and that require magma dynamics that could be explained by flow related to degassing.
Fil: Weinberg, Roberto. Monash University; Australia
Fil: Ortiz Joya, Guillermo. Monash University; Australia
Fil: Vernon, Ron. Macquarie University; Australia
Fil: Araujo, Lucas. Monash University; Australia
Fil: Morfulis Geipel, Marcos Nicolas. 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; Argentina
Fil: Sola, Alfonso Manuel. 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; Argentina
Fil: Suzaño, Nestor Omar. 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; Argentina
Fil: 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; Argentina
Materia
degassing
epizonal plutons
magma hybridization
magma mixing
volatile phase
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/290122
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, ArgentinaWeinberg, RobertoOrtiz Joya, GuillermoVernon, RonAraujo, LucasMorfulis Geipel, Marcos NicolasSola, Alfonso ManuelSuzaño, Nestor OmarBecchio, Raul Albertodegassingepizonal plutonsmagma hybridizationmagma mixingvolatile phasehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Arc magmas are rich in fluids that exsolve forming a volatile phase at some point during ascent and crystallization. Despite expectations that this phase could have a significant impact on the evolution of magma reservoirs, there is relatively little recorded evidence of this impact or even of their passage, other than the upper reaches of the chamber. We hypothesize that this mismatch could be due to a lack of recognition of possible magmatic structures associated with this process. Here, we use meso- and microstructures found in variably disrupted dioritic sills and dykes, forming microdioritic and microgranitic enclaves of a large range of sizes, to explore features that could record the passage of a volatile phase and to argue that its passage facilitated hybridization between the two magmas. We focus on structures formed in three plutons of the Early Paleozoic Famatinian Arc in Argentina.The diorites in these plutons are commonly heterogeneous at cm- to dm-scale and have open and filled miaroles, indicative of the presence of a volatile phase. These miaroles tend to form swarms in the heterogeneous rock that also has quartz ocelli and feldspars with rapakivi texture – features indicative of magma hybridization. These heterogeneous rocks are also associated with a number of curious magmatic structures that we speculate record degassing processes and facilitate hybridization by intensifying melt flow and reactivity between the magmas. These structures indicate that the volatile phase caused bubbly diapirs, gas-driven filter-pressing, local catastrophic transfer of crystals across magmatic contacts, and it likely facilitated pervasive flow of invading leucogranitic melt through the pore space of a mushy diorite. Despite the speculative nature of these conclusions, we argue that there is a range of magmatic structures that remain unexplained and that require magma dynamics that could be explained by flow related to degassing.Fil: Weinberg, Roberto. Monash University; AustraliaFil: Ortiz Joya, Guillermo. Monash University; AustraliaFil: Vernon, Ron. Macquarie University; AustraliaFil: Araujo, Lucas. Monash University; AustraliaFil: Morfulis Geipel, Marcos Nicolas. 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: Sola, Alfonso Manuel. 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: Suzaño, Nestor Omar. 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; ArgentinaOxford University Press2026-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/290122Weinberg, Roberto; Ortiz Joya, Guillermo; Vernon, Ron; Araujo, Lucas; Morfulis Geipel, Marcos Nicolas; et al.; Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina; Oxford University Press; Journal Of Petrology; 67; 4; 3-2026; 1-220022-3530CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/advance-article/doi/10.1093/petrology/egag024/8506967info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egag024info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-08-25T15:12:27Zoai:ri.conicet.gov.ar:11336/290122instacron: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:34982026-08-25 15:12:27.972CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
title Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
spellingShingle Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
Weinberg, Roberto
degassing
epizonal plutons
magma hybridization
magma mixing
volatile phase
title_short Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
title_full Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
title_fullStr Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
title_full_unstemmed Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
title_sort Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina
dc.creator.none.fl_str_mv Weinberg, Roberto
Ortiz Joya, Guillermo
Vernon, Ron
Araujo, Lucas
Morfulis Geipel, Marcos Nicolas
Sola, Alfonso Manuel
Suzaño, Nestor Omar
Becchio, Raul Alberto
author Weinberg, Roberto
author_facet Weinberg, Roberto
Ortiz Joya, Guillermo
Vernon, Ron
Araujo, Lucas
Morfulis Geipel, Marcos Nicolas
Sola, Alfonso Manuel
Suzaño, Nestor Omar
Becchio, Raul Alberto
author_role author
author2 Ortiz Joya, Guillermo
Vernon, Ron
Araujo, Lucas
Morfulis Geipel, Marcos Nicolas
Sola, Alfonso Manuel
Suzaño, Nestor Omar
Becchio, Raul Alberto
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv degassing
epizonal plutons
magma hybridization
magma mixing
volatile phase
topic degassing
epizonal plutons
magma hybridization
magma mixing
volatile phase
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Arc magmas are rich in fluids that exsolve forming a volatile phase at some point during ascent and crystallization. Despite expectations that this phase could have a significant impact on the evolution of magma reservoirs, there is relatively little recorded evidence of this impact or even of their passage, other than the upper reaches of the chamber. We hypothesize that this mismatch could be due to a lack of recognition of possible magmatic structures associated with this process. Here, we use meso- and microstructures found in variably disrupted dioritic sills and dykes, forming microdioritic and microgranitic enclaves of a large range of sizes, to explore features that could record the passage of a volatile phase and to argue that its passage facilitated hybridization between the two magmas. We focus on structures formed in three plutons of the Early Paleozoic Famatinian Arc in Argentina.The diorites in these plutons are commonly heterogeneous at cm- to dm-scale and have open and filled miaroles, indicative of the presence of a volatile phase. These miaroles tend to form swarms in the heterogeneous rock that also has quartz ocelli and feldspars with rapakivi texture – features indicative of magma hybridization. These heterogeneous rocks are also associated with a number of curious magmatic structures that we speculate record degassing processes and facilitate hybridization by intensifying melt flow and reactivity between the magmas. These structures indicate that the volatile phase caused bubbly diapirs, gas-driven filter-pressing, local catastrophic transfer of crystals across magmatic contacts, and it likely facilitated pervasive flow of invading leucogranitic melt through the pore space of a mushy diorite. Despite the speculative nature of these conclusions, we argue that there is a range of magmatic structures that remain unexplained and that require magma dynamics that could be explained by flow related to degassing.
Fil: Weinberg, Roberto. Monash University; Australia
Fil: Ortiz Joya, Guillermo. Monash University; Australia
Fil: Vernon, Ron. Macquarie University; Australia
Fil: Araujo, Lucas. Monash University; Australia
Fil: Morfulis Geipel, Marcos Nicolas. 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; Argentina
Fil: Sola, Alfonso Manuel. 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; Argentina
Fil: Suzaño, Nestor Omar. 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; Argentina
Fil: 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; Argentina
description Arc magmas are rich in fluids that exsolve forming a volatile phase at some point during ascent and crystallization. Despite expectations that this phase could have a significant impact on the evolution of magma reservoirs, there is relatively little recorded evidence of this impact or even of their passage, other than the upper reaches of the chamber. We hypothesize that this mismatch could be due to a lack of recognition of possible magmatic structures associated with this process. Here, we use meso- and microstructures found in variably disrupted dioritic sills and dykes, forming microdioritic and microgranitic enclaves of a large range of sizes, to explore features that could record the passage of a volatile phase and to argue that its passage facilitated hybridization between the two magmas. We focus on structures formed in three plutons of the Early Paleozoic Famatinian Arc in Argentina.The diorites in these plutons are commonly heterogeneous at cm- to dm-scale and have open and filled miaroles, indicative of the presence of a volatile phase. These miaroles tend to form swarms in the heterogeneous rock that also has quartz ocelli and feldspars with rapakivi texture – features indicative of magma hybridization. These heterogeneous rocks are also associated with a number of curious magmatic structures that we speculate record degassing processes and facilitate hybridization by intensifying melt flow and reactivity between the magmas. These structures indicate that the volatile phase caused bubbly diapirs, gas-driven filter-pressing, local catastrophic transfer of crystals across magmatic contacts, and it likely facilitated pervasive flow of invading leucogranitic melt through the pore space of a mushy diorite. Despite the speculative nature of these conclusions, we argue that there is a range of magmatic structures that remain unexplained and that require magma dynamics that could be explained by flow related to degassing.
publishDate 2026
dc.date.none.fl_str_mv 2026-03
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/11336/290122
Weinberg, Roberto; Ortiz Joya, Guillermo; Vernon, Ron; Araujo, Lucas; Morfulis Geipel, Marcos Nicolas; et al.; Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina; Oxford University Press; Journal Of Petrology; 67; 4; 3-2026; 1-22
0022-3530
CONICET Digital
CONICET
url http://hdl.handle.net/11336/290122
identifier_str_mv Weinberg, Roberto; Ortiz Joya, Guillermo; Vernon, Ron; Araujo, Lucas; Morfulis Geipel, Marcos Nicolas; et al.; Degassing Driving Magma Hybridization in Plutons: Structural Evidence from the Famatinian Arc in the Puna Plateau, Argentina; Oxford University Press; Journal Of Petrology; 67; 4; 3-2026; 1-22
0022-3530
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://academic.oup.com/petrology/advance-article/doi/10.1093/petrology/egag024/8506967
info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egag024
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
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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score 13.24418

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