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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/58633
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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) |
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 |
13.070432 |