Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina

Autores
Risse, A.; Trumbull, R. B.; Kay, S. M.; Coira, Beatriz Lidia Luisa; Romer, R. I.
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The late Miocene and younger mafic back-arc lavas in the southern Puna of the central Andean plateau have been attributed to the aftermath of crustal and mantle lithospheric delamination or foundering. In this paper, we analyze in more detail the nature of the back-arc mafic suite magmas, including the conditions of magma generation in the mantle and of magma evolution during ascent and ponding in the crust, using extensive compositional data for phenocryst minerals and olivine-hosted melt inclusions in combination with published and new whole-rock chemical and isotopic data. We estimate that the primary melts last equilibrated with an enriched mantle source at temperatures near 1375ºC and pressures near 2 GPa, which is near the base of the seismically determined 60 km thick crust. A mantle source geochemically enriched by continental material introduced through delamination and subducted erosion processes is required to explain the coincidence of the high 87Sr/86Sr ratios (>0·705) and high Sr concentrations (>700 ppm) of the most primitive lavas (e.g. 9-10 wt % MgO, olivine Fo88). The crystallization conditions inferred from mineral-melt equilibria indicate that olivine (T=1320-12208C) was followed by clinopyroxene (T =1230-1140ºC). Clinopyroxene-melt equilibration pressures of 0·7 to near 1GPa in the most mafic samples indicate that the magmas crystallized at mid-crustal depths of 20-35 km, within a region of inferred partial melt accumulation based on the presence of low seismic velocity zones. Olivine-hosted melt inclusions indicate relatively dry melts (maximum 0·5 wt % H2O) with unusual high-Al basaltic compositions, which are attributed to the high-pressure suppression of plagioclase crystallization. A first stage of crustal contamination before mid-crustal accumulation and crystallization of the mafic magmas is suggested by high O-isotope ratios in olivine phenocrysts and negative Eu anomalies in clinopyroxene from the plagioclase-free mafic lavas. Mixing models based on trace elements and radiogenic isotopes suggest assimilation of silicic melt in the lower crust, similar to contemporaneous glassy dacites with steep REE patterns and negative Eu anomalies. A second stage of crustal assimilation at shallower depths is indicated by the mismatch of incompatible elements in clinopyroxene relative to bulk-rock compositions, by strong positive correlations of radiogenic isotopes with wt % SiO2, and by petrographic observation of partly resorbed and reacted quartz xenocrysts. Mixing calculations require the erupted magmas to have assimilated in total some 15-25% crust.
Fil: Risse, A.. German Research Centre for Geosciences; Alemania
Fil: Trumbull, R. B.. German Research Centre for Geosciences; Alemania
Fil: Kay, S. M.. Cornell University; Estados Unidos
Fil: Coira, Beatriz Lidia Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Romer, R. I.. German Research Centre for Geosciences; Alemania
Materia
Back-Arc Magmatism
Central Andes
Geothermobarometry
Melt Inclusions
La-Icp-Ms
Isotopes
Clinopyroxene
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:11336/12189

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oai_identifier_str oai:ri.conicet.gov.ar:11336/12189
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of ArgentinaRisse, A.Trumbull, R. B.Kay, S. M.Coira, Beatriz Lidia LuisaRomer, R. I.Back-Arc MagmatismCentral AndesGeothermobarometryMelt InclusionsLa-Icp-MsIsotopesClinopyroxenehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The late Miocene and younger mafic back-arc lavas in the southern Puna of the central Andean plateau have been attributed to the aftermath of crustal and mantle lithospheric delamination or foundering. In this paper, we analyze in more detail the nature of the back-arc mafic suite magmas, including the conditions of magma generation in the mantle and of magma evolution during ascent and ponding in the crust, using extensive compositional data for phenocryst minerals and olivine-hosted melt inclusions in combination with published and new whole-rock chemical and isotopic data. We estimate that the primary melts last equilibrated with an enriched mantle source at temperatures near 1375ºC and pressures near 2 GPa, which is near the base of the seismically determined 60 km thick crust. A mantle source geochemically enriched by continental material introduced through delamination and subducted erosion processes is required to explain the coincidence of the high 87Sr/86Sr ratios (>0·705) and high Sr concentrations (>700 ppm) of the most primitive lavas (e.g. 9-10 wt % MgO, olivine Fo88). The crystallization conditions inferred from mineral-melt equilibria indicate that olivine (T=1320-12208C) was followed by clinopyroxene (T =1230-1140ºC). Clinopyroxene-melt equilibration pressures of 0·7 to near 1GPa in the most mafic samples indicate that the magmas crystallized at mid-crustal depths of 20-35 km, within a region of inferred partial melt accumulation based on the presence of low seismic velocity zones. Olivine-hosted melt inclusions indicate relatively dry melts (maximum 0·5 wt % H2O) with unusual high-Al basaltic compositions, which are attributed to the high-pressure suppression of plagioclase crystallization. A first stage of crustal contamination before mid-crustal accumulation and crystallization of the mafic magmas is suggested by high O-isotope ratios in olivine phenocrysts and negative Eu anomalies in clinopyroxene from the plagioclase-free mafic lavas. Mixing models based on trace elements and radiogenic isotopes suggest assimilation of silicic melt in the lower crust, similar to contemporaneous glassy dacites with steep REE patterns and negative Eu anomalies. A second stage of crustal assimilation at shallower depths is indicated by the mismatch of incompatible elements in clinopyroxene relative to bulk-rock compositions, by strong positive correlations of radiogenic isotopes with wt % SiO2, and by petrographic observation of partly resorbed and reacted quartz xenocrysts. Mixing calculations require the erupted magmas to have assimilated in total some 15-25% crust.Fil: Risse, A.. German Research Centre for Geosciences; AlemaniaFil: Trumbull, R. B.. German Research Centre for Geosciences; AlemaniaFil: Kay, S. M.. Cornell University; Estados UnidosFil: Coira, Beatriz Lidia Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Romer, R. I.. German Research Centre for Geosciences; AlemaniaOxford University Press2013-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/12189Risse, A.; Trumbull, R. B.; Kay, S. M.; Coira, Beatriz Lidia Luisa; Romer, R. I.; Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina; Oxford University Press; Journal Of Petrology; 54; 10; 6-2013; 1963-19950022-3530enginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article-lookup/doi/10.1093/petrology/egt038info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1093/petrology/egt038info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:44:02Zoai:ri.conicet.gov.ar:11336/12189instacron: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:34982025-09-29 10:44:03.214CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
title Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
spellingShingle Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
Risse, A.
Back-Arc Magmatism
Central Andes
Geothermobarometry
Melt Inclusions
La-Icp-Ms
Isotopes
Clinopyroxene
title_short Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
title_full Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
title_fullStr Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
title_full_unstemmed Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
title_sort Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina
dc.creator.none.fl_str_mv Risse, A.
Trumbull, R. B.
Kay, S. M.
Coira, Beatriz Lidia Luisa
Romer, R. I.
author Risse, A.
author_facet Risse, A.
Trumbull, R. B.
Kay, S. M.
Coira, Beatriz Lidia Luisa
Romer, R. I.
author_role author
author2 Trumbull, R. B.
Kay, S. M.
Coira, Beatriz Lidia Luisa
Romer, R. I.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Back-Arc Magmatism
Central Andes
Geothermobarometry
Melt Inclusions
La-Icp-Ms
Isotopes
Clinopyroxene
topic Back-Arc Magmatism
Central Andes
Geothermobarometry
Melt Inclusions
La-Icp-Ms
Isotopes
Clinopyroxene
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The late Miocene and younger mafic back-arc lavas in the southern Puna of the central Andean plateau have been attributed to the aftermath of crustal and mantle lithospheric delamination or foundering. In this paper, we analyze in more detail the nature of the back-arc mafic suite magmas, including the conditions of magma generation in the mantle and of magma evolution during ascent and ponding in the crust, using extensive compositional data for phenocryst minerals and olivine-hosted melt inclusions in combination with published and new whole-rock chemical and isotopic data. We estimate that the primary melts last equilibrated with an enriched mantle source at temperatures near 1375ºC and pressures near 2 GPa, which is near the base of the seismically determined 60 km thick crust. A mantle source geochemically enriched by continental material introduced through delamination and subducted erosion processes is required to explain the coincidence of the high 87Sr/86Sr ratios (>0·705) and high Sr concentrations (>700 ppm) of the most primitive lavas (e.g. 9-10 wt % MgO, olivine Fo88). The crystallization conditions inferred from mineral-melt equilibria indicate that olivine (T=1320-12208C) was followed by clinopyroxene (T =1230-1140ºC). Clinopyroxene-melt equilibration pressures of 0·7 to near 1GPa in the most mafic samples indicate that the magmas crystallized at mid-crustal depths of 20-35 km, within a region of inferred partial melt accumulation based on the presence of low seismic velocity zones. Olivine-hosted melt inclusions indicate relatively dry melts (maximum 0·5 wt % H2O) with unusual high-Al basaltic compositions, which are attributed to the high-pressure suppression of plagioclase crystallization. A first stage of crustal contamination before mid-crustal accumulation and crystallization of the mafic magmas is suggested by high O-isotope ratios in olivine phenocrysts and negative Eu anomalies in clinopyroxene from the plagioclase-free mafic lavas. Mixing models based on trace elements and radiogenic isotopes suggest assimilation of silicic melt in the lower crust, similar to contemporaneous glassy dacites with steep REE patterns and negative Eu anomalies. A second stage of crustal assimilation at shallower depths is indicated by the mismatch of incompatible elements in clinopyroxene relative to bulk-rock compositions, by strong positive correlations of radiogenic isotopes with wt % SiO2, and by petrographic observation of partly resorbed and reacted quartz xenocrysts. Mixing calculations require the erupted magmas to have assimilated in total some 15-25% crust.
Fil: Risse, A.. German Research Centre for Geosciences; Alemania
Fil: Trumbull, R. B.. German Research Centre for Geosciences; Alemania
Fil: Kay, S. M.. Cornell University; Estados Unidos
Fil: Coira, Beatriz Lidia Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Romer, R. I.. German Research Centre for Geosciences; Alemania
description The late Miocene and younger mafic back-arc lavas in the southern Puna of the central Andean plateau have been attributed to the aftermath of crustal and mantle lithospheric delamination or foundering. In this paper, we analyze in more detail the nature of the back-arc mafic suite magmas, including the conditions of magma generation in the mantle and of magma evolution during ascent and ponding in the crust, using extensive compositional data for phenocryst minerals and olivine-hosted melt inclusions in combination with published and new whole-rock chemical and isotopic data. We estimate that the primary melts last equilibrated with an enriched mantle source at temperatures near 1375ºC and pressures near 2 GPa, which is near the base of the seismically determined 60 km thick crust. A mantle source geochemically enriched by continental material introduced through delamination and subducted erosion processes is required to explain the coincidence of the high 87Sr/86Sr ratios (>0·705) and high Sr concentrations (>700 ppm) of the most primitive lavas (e.g. 9-10 wt % MgO, olivine Fo88). The crystallization conditions inferred from mineral-melt equilibria indicate that olivine (T=1320-12208C) was followed by clinopyroxene (T =1230-1140ºC). Clinopyroxene-melt equilibration pressures of 0·7 to near 1GPa in the most mafic samples indicate that the magmas crystallized at mid-crustal depths of 20-35 km, within a region of inferred partial melt accumulation based on the presence of low seismic velocity zones. Olivine-hosted melt inclusions indicate relatively dry melts (maximum 0·5 wt % H2O) with unusual high-Al basaltic compositions, which are attributed to the high-pressure suppression of plagioclase crystallization. A first stage of crustal contamination before mid-crustal accumulation and crystallization of the mafic magmas is suggested by high O-isotope ratios in olivine phenocrysts and negative Eu anomalies in clinopyroxene from the plagioclase-free mafic lavas. Mixing models based on trace elements and radiogenic isotopes suggest assimilation of silicic melt in the lower crust, similar to contemporaneous glassy dacites with steep REE patterns and negative Eu anomalies. A second stage of crustal assimilation at shallower depths is indicated by the mismatch of incompatible elements in clinopyroxene relative to bulk-rock compositions, by strong positive correlations of radiogenic isotopes with wt % SiO2, and by petrographic observation of partly resorbed and reacted quartz xenocrysts. Mixing calculations require the erupted magmas to have assimilated in total some 15-25% crust.
publishDate 2013
dc.date.none.fl_str_mv 2013-06
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/11336/12189
Risse, A.; Trumbull, R. B.; Kay, S. M.; Coira, Beatriz Lidia Luisa; Romer, R. I.; Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina; Oxford University Press; Journal Of Petrology; 54; 10; 6-2013; 1963-1995
0022-3530
url http://hdl.handle.net/11336/12189
identifier_str_mv Risse, A.; Trumbull, R. B.; Kay, S. M.; Coira, Beatriz Lidia Luisa; Romer, R. I.; Multi-stage Evolution of Late Neogene Mantle-derived Magmas from the Central Andes Back-arc in the Southern Puna Plateau of Argentina; Oxford University Press; Journal Of Petrology; 54; 10; 6-2013; 1963-1995
0022-3530
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/article-lookup/doi/10.1093/petrology/egt038
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1093/petrology/egt038
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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