An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites
International audience In this study, the effects of H 2 O and Cl on the grain size and nucleation delay of plagioclase in basaltic magma were investigated using dynamic and equilibrium experiments at 1150 ∘ C, 300 MPa, and oxygen fugacity between FMQ − 1.65 and FMQ + 0.05 (fayalite-magnetite-quartz...
Published in: | European Journal of Mineralogy |
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Main Authors: | , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Online Access: | https://insu.hal.science/insu-04378512 https://insu.hal.science/insu-04378512/document https://insu.hal.science/insu-04378512/file/ejm-35-1111-2023.pdf https://doi.org/10.5194/ejm-35-1111-2023 |
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ftbrgm:oai:HAL:insu-04378512v1 |
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Open Polar |
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BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
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ftbrgm |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Heckmann, Paul Iacono-Marziano, Giada Strmić Palinkaš, Sabina An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience In this study, the effects of H 2 O and Cl on the grain size and nucleation delay of plagioclase in basaltic magma were investigated using dynamic and equilibrium experiments at 1150 ∘ C, 300 MPa, and oxygen fugacity between FMQ − 1.65 and FMQ + 0.05 (fayalite-magnetite-quartz). Each experiment consisted of five samples of basaltic composition (from the Hamn intrusion in Northern Norway) containing varying amounts of H 2 O (up to 2 wt %) and Cl (up to 1 wt %). The equilibrium experiments were used as a reference frame for the phase assemblage, geochemical composition, and liquidus temperatures and were compared to thermodynamic models using MELTS software. Experimental phase abundances and plagioclase compositions are in good agreement with the predictions of MELTS. The dynamic experiments were initially heated above the liquidus temperature to destroy crystal nuclei and then kept at 1150 ∘ C for 100, 250, or 1800 min. These experiments show that as the concentration of H 2 O in the melt increases, plagioclase nucleation is delayed, plagioclase abundance decreases, but its size increases. Therefore, the addition of H 2 O seems to favor plagioclase growth at the expense of nucleation. Thermodynamic and kinetic calculations corroborate an increase in the nucleation delay of plagioclase with increasing H 2 O content dissolved in the melt, suggesting that H 2 O decreases the undercooling of the silicate melt. The addition of Cl also seems to delay plagioclase nucleation, although this is not supported by kinetic calculations. Increasing the Cl content decreases plagioclase abundance but does not significantly affect its size. The homogeneous pegmatitic pockets of the mafic-ultramafic Hamn intrusion exhibit several petrological and geochemical features, suggesting that H 2 O and Cl enrichment in the silicate melt was the origin of the pegmatitic texture. The experimental results presented here indicate that H 2 O, rather than Cl, may have played an important role in the formation of the ... |
author2 |
The Arctic University of Norway Tromsø, Norway (UiT) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Magma - UMR7327 Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) University of Bergen (UiB) |
format |
Article in Journal/Newspaper |
author |
Heckmann, Paul Iacono-Marziano, Giada Strmić Palinkaš, Sabina |
author_facet |
Heckmann, Paul Iacono-Marziano, Giada Strmić Palinkaš, Sabina |
author_sort |
Heckmann, Paul |
title |
An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
title_short |
An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
title_full |
An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
title_fullStr |
An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
title_full_unstemmed |
An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
title_sort |
experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://insu.hal.science/insu-04378512 https://insu.hal.science/insu-04378512/document https://insu.hal.science/insu-04378512/file/ejm-35-1111-2023.pdf https://doi.org/10.5194/ejm-35-1111-2023 |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
ISSN: 0935-1221 European Journal of Mineralogy https://insu.hal.science/insu-04378512 European Journal of Mineralogy, 2023, 35, pp.1111-1124. ⟨10.5194/ejm-35-1111-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/ejm-35-1111-2023 insu-04378512 https://insu.hal.science/insu-04378512 https://insu.hal.science/insu-04378512/document https://insu.hal.science/insu-04378512/file/ejm-35-1111-2023.pdf BIBCODE: 2023EJMin.35.1111H doi:10.5194/ejm-35-1111-2023 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/ejm-35-1111-2023 |
container_title |
European Journal of Mineralogy |
container_volume |
35 |
container_issue |
6 |
container_start_page |
1111 |
op_container_end_page |
1124 |
_version_ |
1799486155917361152 |
spelling |
ftbrgm:oai:HAL:insu-04378512v1 2024-05-19T07:46:02+00:00 An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites Heckmann, Paul Iacono-Marziano, Giada Strmić Palinkaš, Sabina The Arctic University of Norway Tromsø, Norway (UiT) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Magma - UMR7327 Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) University of Bergen (UiB) 2023 https://insu.hal.science/insu-04378512 https://insu.hal.science/insu-04378512/document https://insu.hal.science/insu-04378512/file/ejm-35-1111-2023.pdf https://doi.org/10.5194/ejm-35-1111-2023 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/ejm-35-1111-2023 insu-04378512 https://insu.hal.science/insu-04378512 https://insu.hal.science/insu-04378512/document https://insu.hal.science/insu-04378512/file/ejm-35-1111-2023.pdf BIBCODE: 2023EJMin.35.1111H doi:10.5194/ejm-35-1111-2023 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0935-1221 European Journal of Mineralogy https://insu.hal.science/insu-04378512 European Journal of Mineralogy, 2023, 35, pp.1111-1124. ⟨10.5194/ejm-35-1111-2023⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftbrgm https://doi.org/10.5194/ejm-35-1111-2023 2024-05-02T00:07:58Z International audience In this study, the effects of H 2 O and Cl on the grain size and nucleation delay of plagioclase in basaltic magma were investigated using dynamic and equilibrium experiments at 1150 ∘ C, 300 MPa, and oxygen fugacity between FMQ − 1.65 and FMQ + 0.05 (fayalite-magnetite-quartz). Each experiment consisted of five samples of basaltic composition (from the Hamn intrusion in Northern Norway) containing varying amounts of H 2 O (up to 2 wt %) and Cl (up to 1 wt %). The equilibrium experiments were used as a reference frame for the phase assemblage, geochemical composition, and liquidus temperatures and were compared to thermodynamic models using MELTS software. Experimental phase abundances and plagioclase compositions are in good agreement with the predictions of MELTS. The dynamic experiments were initially heated above the liquidus temperature to destroy crystal nuclei and then kept at 1150 ∘ C for 100, 250, or 1800 min. These experiments show that as the concentration of H 2 O in the melt increases, plagioclase nucleation is delayed, plagioclase abundance decreases, but its size increases. Therefore, the addition of H 2 O seems to favor plagioclase growth at the expense of nucleation. Thermodynamic and kinetic calculations corroborate an increase in the nucleation delay of plagioclase with increasing H 2 O content dissolved in the melt, suggesting that H 2 O decreases the undercooling of the silicate melt. The addition of Cl also seems to delay plagioclase nucleation, although this is not supported by kinetic calculations. Increasing the Cl content decreases plagioclase abundance but does not significantly affect its size. The homogeneous pegmatitic pockets of the mafic-ultramafic Hamn intrusion exhibit several petrological and geochemical features, suggesting that H 2 O and Cl enrichment in the silicate melt was the origin of the pegmatitic texture. The experimental results presented here indicate that H 2 O, rather than Cl, may have played an important role in the formation of the ... Article in Journal/Newspaper Northern Norway BRGM: HAL (Bureau de Recherches Géologiques et Minières) European Journal of Mineralogy 35 6 1111 1124 |