Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics.
International audience Kimberlites from West Greenland have Hf-Nd isotope as well as major and trace element compositions that are similar to other Group I kimberlites, but that are distinctive in the spectrum of magmas sampled at Earth's surface. The West Greenland kimberlites have εNdi that r...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hal.science/hal-00337857 https://hal.science/hal-00337857/document https://hal.science/hal-00337857/file/1-s2.0-S0016703707001172-main.pdf https://doi.org/10.1016/j.gca.2007.03.009 |
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ftunivlyon1:oai:HAL:hal-00337857v1 2024-02-11T10:04:15+01:00 Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. Gaffney, Amy M. Blichert-Toft, Janne Nelson, Bruce K. Bizzarro, Martin Rosing, Minik Albarède, Francis Department of Earth and Space Sciences Seattle University of Washington Seattle Laboratoire de Sciences de la Terre (LST) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Geological Museum Copenhagen Natural History Museum of Denmark Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Nordic Centre of Earth Evolution (NORDCEE) University of Copenhagen = Københavns Universitet (UCPH) 2007 https://hal.science/hal-00337857 https://hal.science/hal-00337857/document https://hal.science/hal-00337857/file/1-s2.0-S0016703707001172-main.pdf https://doi.org/10.1016/j.gca.2007.03.009 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2007.03.009 hal-00337857 https://hal.science/hal-00337857 https://hal.science/hal-00337857/document https://hal.science/hal-00337857/file/1-s2.0-S0016703707001172-main.pdf doi:10.1016/j.gca.2007.03.009 info:eu-repo/semantics/OpenAccess ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-00337857 Geochimica et Cosmochimica Acta, 2007, 71 (11), pp.2820-2836. ⟨10.1016/j.gca.2007.03.009⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftunivlyon1 https://doi.org/10.1016/j.gca.2007.03.009 2024-01-16T23:46:45Z International audience Kimberlites from West Greenland have Hf-Nd isotope as well as major and trace element compositions that are similar to other Group I kimberlites, but that are distinctive in the spectrum of magmas sampled at Earth's surface. The West Greenland kimberlites have εNdi that ranges from +1.6 to +3.1 and εHfi that ranges from −4.3 to +4.9. The samples exhibit ubiquitous negative ΔεHfi (deviation from the ocean island basalt εHf-εNd reference line), ranging from −1.8 to −11.2. The kimberlites are characterized by steep heavy rare earth element patterns, positive Ta-Nb anomalies and negative Hf-Zr anomalies. These chemical signals are consistent with the presence of ancient, subducted oceanic crust in the kimberlite source region. In the model we present, dewatering and possibly partial melting of rutile-bearing oceanic crust during subduction results in characteristic trace element patterns in the residual crust. During aging, the Hf-Nd isotopic composition of this dewatered/partially melted EMORB-type crust evolves to negative ΔεHfi values. Metasomatic fluids derived from this ancient subducted oceanic crust infiltrate and impart their trace element and isotopic signal on proximal peridotitic mantle. Melting of this metasomatized mantle peridotite results in kimberlite magmas. Article in Journal/Newspaper Greenland Ocean Island HAL Lyon 1 (University Claude Bernard Lyon 1) Greenland Geochimica et Cosmochimica Acta 71 11 2820 2836 |
institution |
Open Polar |
collection |
HAL Lyon 1 (University Claude Bernard Lyon 1) |
op_collection_id |
ftunivlyon1 |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Gaffney, Amy M. Blichert-Toft, Janne Nelson, Bruce K. Bizzarro, Martin Rosing, Minik Albarède, Francis Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Kimberlites from West Greenland have Hf-Nd isotope as well as major and trace element compositions that are similar to other Group I kimberlites, but that are distinctive in the spectrum of magmas sampled at Earth's surface. The West Greenland kimberlites have εNdi that ranges from +1.6 to +3.1 and εHfi that ranges from −4.3 to +4.9. The samples exhibit ubiquitous negative ΔεHfi (deviation from the ocean island basalt εHf-εNd reference line), ranging from −1.8 to −11.2. The kimberlites are characterized by steep heavy rare earth element patterns, positive Ta-Nb anomalies and negative Hf-Zr anomalies. These chemical signals are consistent with the presence of ancient, subducted oceanic crust in the kimberlite source region. In the model we present, dewatering and possibly partial melting of rutile-bearing oceanic crust during subduction results in characteristic trace element patterns in the residual crust. During aging, the Hf-Nd isotopic composition of this dewatered/partially melted EMORB-type crust evolves to negative ΔεHfi values. Metasomatic fluids derived from this ancient subducted oceanic crust infiltrate and impart their trace element and isotopic signal on proximal peridotitic mantle. Melting of this metasomatized mantle peridotite results in kimberlite magmas. |
author2 |
Department of Earth and Space Sciences Seattle University of Washington Seattle Laboratoire de Sciences de la Terre (LST) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Geological Museum Copenhagen Natural History Museum of Denmark Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Nordic Centre of Earth Evolution (NORDCEE) University of Copenhagen = Københavns Universitet (UCPH) |
format |
Article in Journal/Newspaper |
author |
Gaffney, Amy M. Blichert-Toft, Janne Nelson, Bruce K. Bizzarro, Martin Rosing, Minik Albarède, Francis |
author_facet |
Gaffney, Amy M. Blichert-Toft, Janne Nelson, Bruce K. Bizzarro, Martin Rosing, Minik Albarède, Francis |
author_sort |
Gaffney, Amy M. |
title |
Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. |
title_short |
Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. |
title_full |
Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. |
title_fullStr |
Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. |
title_full_unstemmed |
Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. |
title_sort |
constraints on source-forming processes of west greenland kimberlites inferred from hf-nd isotope systematics. |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00337857 https://hal.science/hal-00337857/document https://hal.science/hal-00337857/file/1-s2.0-S0016703707001172-main.pdf https://doi.org/10.1016/j.gca.2007.03.009 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ocean Island |
genre_facet |
Greenland Ocean Island |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-00337857 Geochimica et Cosmochimica Acta, 2007, 71 (11), pp.2820-2836. ⟨10.1016/j.gca.2007.03.009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2007.03.009 hal-00337857 https://hal.science/hal-00337857 https://hal.science/hal-00337857/document https://hal.science/hal-00337857/file/1-s2.0-S0016703707001172-main.pdf doi:10.1016/j.gca.2007.03.009 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.gca.2007.03.009 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
71 |
container_issue |
11 |
container_start_page |
2820 |
op_container_end_page |
2836 |
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1790600806919045120 |