Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures
International audience Most kimberlites contain abundant dunitic nodules. These are centimetre-sized, rounded and multi-grained assemblages of xenocrystic olivine with a wide range of compositions (Fo83 to Fo94). The absence of orthopyroxene and other mantle minerals and the range of olivine composi...
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ftuniveiffel:oai:HAL:hal-01277963v1 2023-05-15T16:30:15+02:00 Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures Cordier, Carole Sauzeat, Lucie Arndt, Nicholas T. Boullier, Anne-Marie Batanova, Valentina Barou, Fabrice Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) 2015-09 https://hal.science/hal-01277963 https://doi.org/10.1093/petrology/egv054 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egv054 hal-01277963 https://hal.science/hal-01277963 doi:10.1093/petrology/egv054 ISSN: 0022-3530 EISSN: 1460-2415 Journal of Petrology https://hal.science/hal-01277963 Journal of Petrology, 2015, 56 (9), pp.1775-1795. ⟨10.1093/petrology/egv054⟩ dunite grain boundary migration kimberlite metasomatism olivine xenocryst [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography info:eu-repo/semantics/article Journal articles 2015 ftuniveiffel https://doi.org/10.1093/petrology/egv054 2023-03-25T22:09:10Z International audience Most kimberlites contain abundant dunitic nodules. These are centimetre-sized, rounded and multi-grained assemblages of xenocrystic olivine with a wide range of compositions (Fo83 to Fo94). The absence of orthopyroxene and other mantle minerals and the range of olivine compositions have been attributed to reaction between mantle peridotite and (proto)kimberlitic fluid or melt, but the timing of the reaction is a subject of debate. In a kimberlite from the Kangamiut region of Greenland, nodule cores are surrounded by fine-grained outer margins with near-constant Fo contents (∼Fo88) but highly variable minor element contents (e.g. 500–2500 ppm Ni). These margins crystallized from the kimberlite melt and we show that their compositions can be explained by crystallization of olivine alone, if a high partition coefficient for Ni between melt and olivine (DNi > 20) is assumed. Orthopyroxene assimilation is not required, removing the constraint that its dissolution occurred during ascent of the kimberlite magma. Within some nodules, in addition to the usual core-to-margin gradients, we observe asymmetric compositional changes (variable Fo but near-constant minor element contents) across mobile grain boundaries. These changes document fluid percolation at the grain scale that occurred during dynamic recrystallization in the deforming lithospheric mantle. We note that chemical gradients associated with mobile grain boundaries are observed in olivines that cover the entire compositional range of the nodules, and propose that fluid-assisted dynamic recrystallization took place in dunite that was already compositionally heterogeneous. Reaction between peridotite and protokimberlitic melt or fluid and dissolution of orthopyroxene thus occurred within the lithospheric mantle, immediately (a few days) prior to the ascent of the kimberlite melt and the entrainment of the dunite nodules. We propose that the grain boundary zones probably mimic, at a fine scale, the fluid–peridotite interaction that ... Article in Journal/Newspaper Greenland HAL Univ-Eiffel (Université Gustave Eiffel) Greenland Journal of Petrology 56 9 1775 1796 |
institution |
Open Polar |
collection |
HAL Univ-Eiffel (Université Gustave Eiffel) |
op_collection_id |
ftuniveiffel |
language |
English |
topic |
dunite grain boundary migration kimberlite metasomatism olivine xenocryst [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
spellingShingle |
dunite grain boundary migration kimberlite metasomatism olivine xenocryst [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Cordier, Carole Sauzeat, Lucie Arndt, Nicholas T. Boullier, Anne-Marie Batanova, Valentina Barou, Fabrice Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures |
topic_facet |
dunite grain boundary migration kimberlite metasomatism olivine xenocryst [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
description |
International audience Most kimberlites contain abundant dunitic nodules. These are centimetre-sized, rounded and multi-grained assemblages of xenocrystic olivine with a wide range of compositions (Fo83 to Fo94). The absence of orthopyroxene and other mantle minerals and the range of olivine compositions have been attributed to reaction between mantle peridotite and (proto)kimberlitic fluid or melt, but the timing of the reaction is a subject of debate. In a kimberlite from the Kangamiut region of Greenland, nodule cores are surrounded by fine-grained outer margins with near-constant Fo contents (∼Fo88) but highly variable minor element contents (e.g. 500–2500 ppm Ni). These margins crystallized from the kimberlite melt and we show that their compositions can be explained by crystallization of olivine alone, if a high partition coefficient for Ni between melt and olivine (DNi > 20) is assumed. Orthopyroxene assimilation is not required, removing the constraint that its dissolution occurred during ascent of the kimberlite magma. Within some nodules, in addition to the usual core-to-margin gradients, we observe asymmetric compositional changes (variable Fo but near-constant minor element contents) across mobile grain boundaries. These changes document fluid percolation at the grain scale that occurred during dynamic recrystallization in the deforming lithospheric mantle. We note that chemical gradients associated with mobile grain boundaries are observed in olivines that cover the entire compositional range of the nodules, and propose that fluid-assisted dynamic recrystallization took place in dunite that was already compositionally heterogeneous. Reaction between peridotite and protokimberlitic melt or fluid and dissolution of orthopyroxene thus occurred within the lithospheric mantle, immediately (a few days) prior to the ascent of the kimberlite melt and the entrainment of the dunite nodules. We propose that the grain boundary zones probably mimic, at a fine scale, the fluid–peridotite interaction that ... |
author2 |
Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) |
format |
Article in Journal/Newspaper |
author |
Cordier, Carole Sauzeat, Lucie Arndt, Nicholas T. Boullier, Anne-Marie Batanova, Valentina Barou, Fabrice |
author_facet |
Cordier, Carole Sauzeat, Lucie Arndt, Nicholas T. Boullier, Anne-Marie Batanova, Valentina Barou, Fabrice |
author_sort |
Cordier, Carole |
title |
Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures |
title_short |
Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures |
title_full |
Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures |
title_fullStr |
Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures |
title_full_unstemmed |
Metasomatism of the Lithospheric Mantle Immediately Precedes Kimberlite Eruption: New Evidence from Olivine Composition and Microstructures |
title_sort |
metasomatism of the lithospheric mantle immediately precedes kimberlite eruption: new evidence from olivine composition and microstructures |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01277963 https://doi.org/10.1093/petrology/egv054 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
ISSN: 0022-3530 EISSN: 1460-2415 Journal of Petrology https://hal.science/hal-01277963 Journal of Petrology, 2015, 56 (9), pp.1775-1795. ⟨10.1093/petrology/egv054⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egv054 hal-01277963 https://hal.science/hal-01277963 doi:10.1093/petrology/egv054 |
op_doi |
https://doi.org/10.1093/petrology/egv054 |
container_title |
Journal of Petrology |
container_volume |
56 |
container_issue |
9 |
container_start_page |
1775 |
op_container_end_page |
1796 |
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1766019961489195008 |