Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes

Autores
Mundl, A.; Ntaflos, T.; Ackerman, L.; Bizimis, M.; Bjerg, Ernesto Alfredo; Wegner, W.; Hauzenberger, C. A.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Alkali basalt hosted mantle xenoliths were sampled at four locations within the North Patagonian Massif, Argentina. The subcontinental lithospheric mantle (SCLM) beneath Comallo, Puesto Diaz and Cerro Chenque is mostly represented by spinel-harzburgites, whereas at Prahuaniyeu, spinel-garnet- and garnet-peridotites occur next to spinel-peridotites. Partial melting estimates for the north Patagonian mantle xenoliths determined from clinopyroxene trace element abundances reveal up to 25% melt extraction. Whereas the SCLM beneath Puesto Diaz, Cerro Chenque and Comallo is exclusively represented by highly depleted mantle xenoliths, the Prahuaniyeu sample suite comprises both fertile lherzolites and depleted harzburgites. Elevated trace element contents in all the studied north Patagonian mantle samples indicate that melt-rock interaction took place after an initial melt depletion event. Variable primitive mantle normalized REE patterns of clinopyroxenes from within one sample locality suggest compositional changes attributed to melt percolation, which has not significantly affected the bulk-rock and mineral major element compositions. Melt percolation processes have also been detected in the isotopic compositions of the xenoliths, as well as in their highly siderophile element systematics. Hf isotopic compositions are decoupled from those of Nd and Sr and have been affected by variable degrees of enrichment. Platinum group element (PGE) abundances also reveal indications of melt-rock reaction. In some samples this is reflected in fractionation of the iridium-group PGE and/or enrichment in the palladium-group PGE and/or rhenium, which cannot result merely from partial melting processes. Rhenium depletion ages (TRD) determined from Os isotopic analyses reveal an at least late Paleoproterozoic (1·7 Ga) stabilization of the Prahuaniyeu SCLM. Mantle xenoliths sampled from beneath Comallo and Puesto Diaz-Cerro Chenque yield distinctly younger TRD of 1·3 Ga and 1·0 Ga, respectively. Distinct differences in the character of mantle xenoliths from Prahuaniyeu and from Puesto Diaz and Cerro Chenque (i.e. SCLM stabilization age and range of fertility) suggest that at least two SCLM domains exist below the North Patagonian Massif.
Fil: Mundl, A.. University of Vienna. Department Lithospheric Research; Austria
Fil: Ntaflos, T.. University of Vienna. Department Lithospheric Research; Austria
Fil: Ackerman, L.. Academy of Sciences of the Czech Republic; República Checa
Fil: Bizimis, M.. University of South Carolina,; Estados Unidos
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: Wegner, W.. University of Vienna. Department Lithospheric Research; Austria
Fil: Hauzenberger, C. A.. University of Graz; Austria
Materia
Metasomatism
Patagonia
Radiogenic Isotopes
Re-Os
Sclm
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:11336/58633

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network_name_str CONICET Digital (CONICET)
spelling Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processesMundl, A.Ntaflos, T.Ackerman, L.Bizimis, M.Bjerg, Ernesto AlfredoWegner, W.Hauzenberger, C. A.MetasomatismPatagoniaRadiogenic IsotopesRe-OsSclmhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Alkali basalt hosted mantle xenoliths were sampled at four locations within the North Patagonian Massif, Argentina. The subcontinental lithospheric mantle (SCLM) beneath Comallo, Puesto Diaz and Cerro Chenque is mostly represented by spinel-harzburgites, whereas at Prahuaniyeu, spinel-garnet- and garnet-peridotites occur next to spinel-peridotites. Partial melting estimates for the north Patagonian mantle xenoliths determined from clinopyroxene trace element abundances reveal up to 25% melt extraction. Whereas the SCLM beneath Puesto Diaz, Cerro Chenque and Comallo is exclusively represented by highly depleted mantle xenoliths, the Prahuaniyeu sample suite comprises both fertile lherzolites and depleted harzburgites. Elevated trace element contents in all the studied north Patagonian mantle samples indicate that melt-rock interaction took place after an initial melt depletion event. Variable primitive mantle normalized REE patterns of clinopyroxenes from within one sample locality suggest compositional changes attributed to melt percolation, which has not significantly affected the bulk-rock and mineral major element compositions. Melt percolation processes have also been detected in the isotopic compositions of the xenoliths, as well as in their highly siderophile element systematics. Hf isotopic compositions are decoupled from those of Nd and Sr and have been affected by variable degrees of enrichment. Platinum group element (PGE) abundances also reveal indications of melt-rock reaction. In some samples this is reflected in fractionation of the iridium-group PGE and/or enrichment in the palladium-group PGE and/or rhenium, which cannot result merely from partial melting processes. Rhenium depletion ages (TRD) determined from Os isotopic analyses reveal an at least late Paleoproterozoic (1·7 Ga) stabilization of the Prahuaniyeu SCLM. Mantle xenoliths sampled from beneath Comallo and Puesto Diaz-Cerro Chenque yield distinctly younger TRD of 1·3 Ga and 1·0 Ga, respectively. Distinct differences in the character of mantle xenoliths from Prahuaniyeu and from Puesto Diaz and Cerro Chenque (i.e. SCLM stabilization age and range of fertility) suggest that at least two SCLM domains exist below the North Patagonian Massif.Fil: Mundl, A.. University of Vienna. Department Lithospheric Research; AustriaFil: Ntaflos, T.. University of Vienna. Department Lithospheric Research; AustriaFil: Ackerman, L.. Academy of Sciences of the Czech Republic; República ChecaFil: Bizimis, M.. University of South Carolina,; Estados UnidosFil: 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: Wegner, W.. University of Vienna. Department Lithospheric Research; AustriaFil: Hauzenberger, C. A.. University of Graz; AustriaOxford University Press2016-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/58633Mundl, A.; Ntaflos, T.; Ackerman, L.; Bizimis, M.; Bjerg, Ernesto Alfredo; et al.; Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes; Oxford University Press; Journal Of Petrology; 57; 4; 1-4-2016; 685-7150022-3530CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/57/4/685/2223215info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egv048info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:40:03Zoai:ri.conicet.gov.ar:11336/58633instacron: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 09:40:03.424CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
title Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
spellingShingle Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
Mundl, A.
Metasomatism
Patagonia
Radiogenic Isotopes
Re-Os
Sclm
title_short Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
title_full Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
title_fullStr Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
title_full_unstemmed Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
title_sort Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes
dc.creator.none.fl_str_mv Mundl, A.
Ntaflos, T.
Ackerman, L.
Bizimis, M.
Bjerg, Ernesto Alfredo
Wegner, W.
Hauzenberger, C. A.
author Mundl, A.
author_facet Mundl, A.
Ntaflos, T.
Ackerman, L.
Bizimis, M.
Bjerg, Ernesto Alfredo
Wegner, W.
Hauzenberger, C. A.
author_role author
author2 Ntaflos, T.
Ackerman, L.
Bizimis, M.
Bjerg, Ernesto Alfredo
Wegner, W.
Hauzenberger, C. A.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Metasomatism
Patagonia
Radiogenic Isotopes
Re-Os
Sclm
topic Metasomatism
Patagonia
Radiogenic Isotopes
Re-Os
Sclm
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Alkali basalt hosted mantle xenoliths were sampled at four locations within the North Patagonian Massif, Argentina. The subcontinental lithospheric mantle (SCLM) beneath Comallo, Puesto Diaz and Cerro Chenque is mostly represented by spinel-harzburgites, whereas at Prahuaniyeu, spinel-garnet- and garnet-peridotites occur next to spinel-peridotites. Partial melting estimates for the north Patagonian mantle xenoliths determined from clinopyroxene trace element abundances reveal up to 25% melt extraction. Whereas the SCLM beneath Puesto Diaz, Cerro Chenque and Comallo is exclusively represented by highly depleted mantle xenoliths, the Prahuaniyeu sample suite comprises both fertile lherzolites and depleted harzburgites. Elevated trace element contents in all the studied north Patagonian mantle samples indicate that melt-rock interaction took place after an initial melt depletion event. Variable primitive mantle normalized REE patterns of clinopyroxenes from within one sample locality suggest compositional changes attributed to melt percolation, which has not significantly affected the bulk-rock and mineral major element compositions. Melt percolation processes have also been detected in the isotopic compositions of the xenoliths, as well as in their highly siderophile element systematics. Hf isotopic compositions are decoupled from those of Nd and Sr and have been affected by variable degrees of enrichment. Platinum group element (PGE) abundances also reveal indications of melt-rock reaction. In some samples this is reflected in fractionation of the iridium-group PGE and/or enrichment in the palladium-group PGE and/or rhenium, which cannot result merely from partial melting processes. Rhenium depletion ages (TRD) determined from Os isotopic analyses reveal an at least late Paleoproterozoic (1·7 Ga) stabilization of the Prahuaniyeu SCLM. Mantle xenoliths sampled from beneath Comallo and Puesto Diaz-Cerro Chenque yield distinctly younger TRD of 1·3 Ga and 1·0 Ga, respectively. Distinct differences in the character of mantle xenoliths from Prahuaniyeu and from Puesto Diaz and Cerro Chenque (i.e. SCLM stabilization age and range of fertility) suggest that at least two SCLM domains exist below the North Patagonian Massif.
Fil: Mundl, A.. University of Vienna. Department Lithospheric Research; Austria
Fil: Ntaflos, T.. University of Vienna. Department Lithospheric Research; Austria
Fil: Ackerman, L.. Academy of Sciences of the Czech Republic; República Checa
Fil: Bizimis, M.. University of South Carolina,; Estados Unidos
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: Wegner, W.. University of Vienna. Department Lithospheric Research; Austria
Fil: Hauzenberger, C. A.. University of Graz; Austria
description Alkali basalt hosted mantle xenoliths were sampled at four locations within the North Patagonian Massif, Argentina. The subcontinental lithospheric mantle (SCLM) beneath Comallo, Puesto Diaz and Cerro Chenque is mostly represented by spinel-harzburgites, whereas at Prahuaniyeu, spinel-garnet- and garnet-peridotites occur next to spinel-peridotites. Partial melting estimates for the north Patagonian mantle xenoliths determined from clinopyroxene trace element abundances reveal up to 25% melt extraction. Whereas the SCLM beneath Puesto Diaz, Cerro Chenque and Comallo is exclusively represented by highly depleted mantle xenoliths, the Prahuaniyeu sample suite comprises both fertile lherzolites and depleted harzburgites. Elevated trace element contents in all the studied north Patagonian mantle samples indicate that melt-rock interaction took place after an initial melt depletion event. Variable primitive mantle normalized REE patterns of clinopyroxenes from within one sample locality suggest compositional changes attributed to melt percolation, which has not significantly affected the bulk-rock and mineral major element compositions. Melt percolation processes have also been detected in the isotopic compositions of the xenoliths, as well as in their highly siderophile element systematics. Hf isotopic compositions are decoupled from those of Nd and Sr and have been affected by variable degrees of enrichment. Platinum group element (PGE) abundances also reveal indications of melt-rock reaction. In some samples this is reflected in fractionation of the iridium-group PGE and/or enrichment in the palladium-group PGE and/or rhenium, which cannot result merely from partial melting processes. Rhenium depletion ages (TRD) determined from Os isotopic analyses reveal an at least late Paleoproterozoic (1·7 Ga) stabilization of the Prahuaniyeu SCLM. Mantle xenoliths sampled from beneath Comallo and Puesto Diaz-Cerro Chenque yield distinctly younger TRD of 1·3 Ga and 1·0 Ga, respectively. Distinct differences in the character of mantle xenoliths from Prahuaniyeu and from Puesto Diaz and Cerro Chenque (i.e. SCLM stabilization age and range of fertility) suggest that at least two SCLM domains exist below the North Patagonian Massif.
publishDate 2016
dc.date.none.fl_str_mv 2016-04-01
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/11336/58633
Mundl, A.; Ntaflos, T.; Ackerman, L.; Bizimis, M.; Bjerg, Ernesto Alfredo; et al.; Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes; Oxford University Press; Journal Of Petrology; 57; 4; 1-4-2016; 685-715
0022-3530
CONICET Digital
CONICET
url http://hdl.handle.net/11336/58633
identifier_str_mv Mundl, A.; Ntaflos, T.; Ackerman, L.; Bizimis, M.; Bjerg, Ernesto Alfredo; et al.; Geochemical and Os-Hf-Nd-Sr isotopic characterization of north patagonian mantle xenoliths: Implications for extensive melt extraction and percolation processes; Oxford University Press; Journal Of Petrology; 57; 4; 1-4-2016; 685-715
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/article/57/4/685/2223215
info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egv048
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)
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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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