Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites

Autores
Bjerg, Ernesto Alfredo; Ntaflos, Theodoros; Thöni, Martin; Aliani, Paola; Labudia, Carlos Horacio
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Prahuaniyeu, located on the NW margin of the Somoncura Large Igneous Province in northern Patagonia, is one of two known localities in Argentina where mantle-derived garnet- and spinel-bearing peridotites occur associated with alkali basalts; the other locality is the Pali Aike volcanic field of southern Patagonia. Most of the Prahuaniyeu garnet-bearing peridotites are fertile in terms of their Al2 O3 and CaO contents, whereas the spinel-bearing peridotites cover a wide range from fertile to depleted compositions. Whole-rock light rare earth element (LREE) enrichment in the garnet-bearing peridotites and partly in the spinel-peridotites is consistent with intergranular percolation of the host basalt melt, as hydrous phases are not present and the clinopyroxenes and garnets are not enriched in LREE. Lack of slab-derived component(s) in the metasomatic products rules out the participation of a subducted slab in the generation of these basalts. In situ clinopyroxene analyses suggest that a group of spinel-peridotites experienced cryptic metasomatism by carbonatitic melts. Non-metasomatized garnet- and spinel-peridotites have experienced fractional melting ranging from 1 to 3% and from 5 to 12%, respectively. The Prahuaniyeu xenoliths lie on an elevated geotherm (high temperatures at low pressure) implying convective heat transport. The two most fertile samples, which indicate apparent internal 'ages' between c. 10 and 30 Ma for the sub-Prahuaniyeu lithospheric mantle, suggest resetting of the Sm-Nd isotopic system under a high-temperature regime and most probably reflect closure of the system following this 'high- T event', which can be related to extensive magmatic activity within the Somoncura province, starting in the Eocene and finishing in the Miocene.
Fil: Bjerg, Ernesto Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Ntaflos, Theodoros. Universidad de Viena; Austria
Fil: Thöni, Martin. Universidad de Viena; Austria
Fil: Aliani, Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Labudia, Carlos Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Materia
Garnet-Peridotite
Mantle Xenoliths
Metasomatism
Northern Patagonia
Prahuaniyeu
Spinel-Peridotite
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:11336/74810
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/74810
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotitesBjerg, Ernesto AlfredoNtaflos, TheodorosThöni, MartinAliani, PaolaLabudia, Carlos HoracioGarnet-PeridotiteMantle XenolithsMetasomatismNorthern PatagoniaPrahuaniyeuSpinel-Peridotitehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Prahuaniyeu, located on the NW margin of the Somoncura Large Igneous Province in northern Patagonia, is one of two known localities in Argentina where mantle-derived garnet- and spinel-bearing peridotites occur associated with alkali basalts; the other locality is the Pali Aike volcanic field of southern Patagonia. Most of the Prahuaniyeu garnet-bearing peridotites are fertile in terms of their Al2 O3 and CaO contents, whereas the spinel-bearing peridotites cover a wide range from fertile to depleted compositions. Whole-rock light rare earth element (LREE) enrichment in the garnet-bearing peridotites and partly in the spinel-peridotites is consistent with intergranular percolation of the host basalt melt, as hydrous phases are not present and the clinopyroxenes and garnets are not enriched in LREE. Lack of slab-derived component(s) in the metasomatic products rules out the participation of a subducted slab in the generation of these basalts. In situ clinopyroxene analyses suggest that a group of spinel-peridotites experienced cryptic metasomatism by carbonatitic melts. Non-metasomatized garnet- and spinel-peridotites have experienced fractional melting ranging from 1 to 3% and from 5 to 12%, respectively. The Prahuaniyeu xenoliths lie on an elevated geotherm (high temperatures at low pressure) implying convective heat transport. The two most fertile samples, which indicate apparent internal 'ages' between c. 10 and 30 Ma for the sub-Prahuaniyeu lithospheric mantle, suggest resetting of the Sm-Nd isotopic system under a high-temperature regime and most probably reflect closure of the system following this 'high- T event', which can be related to extensive magmatic activity within the Somoncura province, starting in the Eocene and finishing in the Miocene.Fil: Bjerg, Ernesto Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Ntaflos, Theodoros. Universidad de Viena; AustriaFil: Thöni, Martin. Universidad de Viena; AustriaFil: Aliani, Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Labudia, Carlos Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaOxford University Press2009-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/74810Bjerg, Ernesto Alfredo; Ntaflos, Theodoros; Thöni, Martin; Aliani, Paola; Labudia, Carlos Horacio; Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites; Oxford University Press; Journal Of Petrology; 50; 7; 12-2009; 1267-12980022-3530CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egp021info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/50/7/1267/1512987info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:54:07Zoai:ri.conicet.gov.ar:11336/74810instacron: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:34982025-09-03 09:54:07.714CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
title Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
spellingShingle Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
Bjerg, Ernesto Alfredo
Garnet-Peridotite
Mantle Xenoliths
Metasomatism
Northern Patagonia
Prahuaniyeu
Spinel-Peridotite
title_short Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
title_full Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
title_fullStr Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
title_full_unstemmed Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
title_sort Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites
dc.creator.none.fl_str_mv Bjerg, Ernesto Alfredo
Ntaflos, Theodoros
Thöni, Martin
Aliani, Paola
Labudia, Carlos Horacio
author Bjerg, Ernesto Alfredo
author_facet Bjerg, Ernesto Alfredo
Ntaflos, Theodoros
Thöni, Martin
Aliani, Paola
Labudia, Carlos Horacio
author_role author
author2 Ntaflos, Theodoros
Thöni, Martin
Aliani, Paola
Labudia, Carlos Horacio
author2_role author
author
author
author
dc.subject.none.fl_str_mv Garnet-Peridotite
Mantle Xenoliths
Metasomatism
Northern Patagonia
Prahuaniyeu
Spinel-Peridotite
topic Garnet-Peridotite
Mantle Xenoliths
Metasomatism
Northern Patagonia
Prahuaniyeu
Spinel-Peridotite
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Prahuaniyeu, located on the NW margin of the Somoncura Large Igneous Province in northern Patagonia, is one of two known localities in Argentina where mantle-derived garnet- and spinel-bearing peridotites occur associated with alkali basalts; the other locality is the Pali Aike volcanic field of southern Patagonia. Most of the Prahuaniyeu garnet-bearing peridotites are fertile in terms of their Al2 O3 and CaO contents, whereas the spinel-bearing peridotites cover a wide range from fertile to depleted compositions. Whole-rock light rare earth element (LREE) enrichment in the garnet-bearing peridotites and partly in the spinel-peridotites is consistent with intergranular percolation of the host basalt melt, as hydrous phases are not present and the clinopyroxenes and garnets are not enriched in LREE. Lack of slab-derived component(s) in the metasomatic products rules out the participation of a subducted slab in the generation of these basalts. In situ clinopyroxene analyses suggest that a group of spinel-peridotites experienced cryptic metasomatism by carbonatitic melts. Non-metasomatized garnet- and spinel-peridotites have experienced fractional melting ranging from 1 to 3% and from 5 to 12%, respectively. The Prahuaniyeu xenoliths lie on an elevated geotherm (high temperatures at low pressure) implying convective heat transport. The two most fertile samples, which indicate apparent internal 'ages' between c. 10 and 30 Ma for the sub-Prahuaniyeu lithospheric mantle, suggest resetting of the Sm-Nd isotopic system under a high-temperature regime and most probably reflect closure of the system following this 'high- T event', which can be related to extensive magmatic activity within the Somoncura province, starting in the Eocene and finishing in the Miocene.
Fil: Bjerg, Ernesto Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Ntaflos, Theodoros. Universidad de Viena; Austria
Fil: Thöni, Martin. Universidad de Viena; Austria
Fil: Aliani, Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Labudia, Carlos Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
description Prahuaniyeu, located on the NW margin of the Somoncura Large Igneous Province in northern Patagonia, is one of two known localities in Argentina where mantle-derived garnet- and spinel-bearing peridotites occur associated with alkali basalts; the other locality is the Pali Aike volcanic field of southern Patagonia. Most of the Prahuaniyeu garnet-bearing peridotites are fertile in terms of their Al2 O3 and CaO contents, whereas the spinel-bearing peridotites cover a wide range from fertile to depleted compositions. Whole-rock light rare earth element (LREE) enrichment in the garnet-bearing peridotites and partly in the spinel-peridotites is consistent with intergranular percolation of the host basalt melt, as hydrous phases are not present and the clinopyroxenes and garnets are not enriched in LREE. Lack of slab-derived component(s) in the metasomatic products rules out the participation of a subducted slab in the generation of these basalts. In situ clinopyroxene analyses suggest that a group of spinel-peridotites experienced cryptic metasomatism by carbonatitic melts. Non-metasomatized garnet- and spinel-peridotites have experienced fractional melting ranging from 1 to 3% and from 5 to 12%, respectively. The Prahuaniyeu xenoliths lie on an elevated geotherm (high temperatures at low pressure) implying convective heat transport. The two most fertile samples, which indicate apparent internal 'ages' between c. 10 and 30 Ma for the sub-Prahuaniyeu lithospheric mantle, suggest resetting of the Sm-Nd isotopic system under a high-temperature regime and most probably reflect closure of the system following this 'high- T event', which can be related to extensive magmatic activity within the Somoncura province, starting in the Eocene and finishing in the Miocene.
publishDate 2009
dc.date.none.fl_str_mv 2009-12
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/11336/74810
Bjerg, Ernesto Alfredo; Ntaflos, Theodoros; Thöni, Martin; Aliani, Paola; Labudia, Carlos Horacio; Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites; Oxford University Press; Journal Of Petrology; 50; 7; 12-2009; 1267-1298
0022-3530
CONICET Digital
CONICET
url http://hdl.handle.net/11336/74810
identifier_str_mv Bjerg, Ernesto Alfredo; Ntaflos, Theodoros; Thöni, Martin; Aliani, Paola; Labudia, Carlos Horacio; Heterogeneous lithospheric mantle beneath Northern Patagonia: Evidence from Prahuaniyeu garnet- and spinel-peridotites; Oxford University Press; Journal Of Petrology; 50; 7; 12-2009; 1267-1298
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/doi/10.1093/petrology/egp021
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/50/7/1267/1512987
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
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 13.13397

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