Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes.
A study of melt inclusions (MIs) has allowed us to follow the dissolved volatile evolution in the magmatic system of Hekla volcano during the melt differentiation (fractional crystallization). This work has allowed us to predict the “expected” volatile concentrations, which correspond to the volatil...
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Other Authors: | , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2005
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Online Access: | https://tel.archives-ouvertes.fr/tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542/document https://tel.archives-ouvertes.fr/tel-00011542/file/These_Severine_Moune_ter.pdf |
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ftccsdartic:oai:HAL:tel-00011542v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Volcanoes Magma degassing Volcanic gases Melt inclusions Trace elements Volatility Sulfur Halogens REE Dissolution of silicate glasses Dissolution de verres silicatés Volcans Dégazage magmatique Gaz volcaniques Inclusions magmatiques Eléments traces Volatilité Soufre Halogènes Terres Rares [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Volcanoes Magma degassing Volcanic gases Melt inclusions Trace elements Volatility Sulfur Halogens REE Dissolution of silicate glasses Dissolution de verres silicatés Volcans Dégazage magmatique Gaz volcaniques Inclusions magmatiques Eléments traces Volatilité Soufre Halogènes Terres Rares [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Moune, Séverine Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. |
topic_facet |
Volcanoes Magma degassing Volcanic gases Melt inclusions Trace elements Volatility Sulfur Halogens REE Dissolution of silicate glasses Dissolution de verres silicatés Volcans Dégazage magmatique Gaz volcaniques Inclusions magmatiques Eléments traces Volatilité Soufre Halogènes Terres Rares [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
A study of melt inclusions (MIs) has allowed us to follow the dissolved volatile evolution in the magmatic system of Hekla volcano during the melt differentiation (fractional crystallization). This work has allowed us to predict the “expected” volatile concentrations, which correspond to the volatile contents in the basaltic icelandite melt just prior to eruption. Such approach avoids underestimation of the pre-eruptive volatile contents measured in MIs and improves the estimates on the volatile mass released into the atmosphere. This approach has suggested that the magma carried 0.1 Mt of HCl, 0.2 Mt of HF and 3.8 of SO2 into the atmosphere during the 2000 Hekla eruption. Moreover, the Plinian phase of this eruption emitted a mixed tephra-gas plume that was scavenged by snowstorms, offering the unique opportunity to better study the geochemistry of this explosive gas phase. The study of these snow samples has shown that enrichment of most of volatile trace elements is linked to a degassing process as halides and/or sulfates. More surprisingly, refractory elements are also enriched in the gaseous phase of Hekla and they are best explained by the non-stoechiometric partial dissolution of tephra by F-rich volcanic gases in the eruptive plume. A study based on MIs has confirmed the hypothesis emitted by Walker et al. (1993) in which differentiation of tholeiitic magmas of Masaya occurs at shallow depth from a "dry" magma also characterized by its homogeneous composition. Moreover, chemical and physical characterizations of volcanic aerosols by SEM and chemical analyses of the eruptive phase of Masaya have allowed us to conclude that trace elements are mostly degassed and transported in Masaya's plume as chlorides, but also as sulfates and/or chloro-sulfates. Volatile trace element contribution to the atmosphere has also been estimated showing that the volcanic plume of Masaya is an important source of atmospheric pollution on the regional scale. L'axe principal de cette thèse est la caractérisation des processus ... |
author2 |
Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Blaise Pascal - Clermont-Ferrand II Sigmarsson Olgeir(olgeir@opgc.univ-bpclermont.fr) |
format |
Doctoral or Postdoctoral Thesis |
author |
Moune, Séverine |
author_facet |
Moune, Séverine |
author_sort |
Moune, Séverine |
title |
Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. |
title_short |
Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. |
title_full |
Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. |
title_fullStr |
Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. |
title_full_unstemmed |
Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. |
title_sort |
minor volatiles (s, cl, f) and trace elements in pre-eruptive magmas and volcanic gases. an investigation of magma degassing processes on hekla (iceland) and masaya (nicaragua) volcanoes. |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://tel.archives-ouvertes.fr/tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542/document https://tel.archives-ouvertes.fr/tel-00011542/file/These_Severine_Moune_ter.pdf |
genre |
Hekla Iceland Islande |
genre_facet |
Hekla Iceland Islande |
op_source |
https://tel.archives-ouvertes.fr/tel-00011542 Géochimie. Université Blaise Pascal - Clermont-Ferrand II, 2005. Français. ⟨NNT : 2005CLF21627⟩ |
op_relation |
NNT: 2005CLF21627 tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542/document https://tel.archives-ouvertes.fr/tel-00011542/file/These_Severine_Moune_ter.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766023775099289600 |
spelling |
ftccsdartic:oai:HAL:tel-00011542v1 2023-05-15T16:34:01+02:00 Minor volatiles (S, Cl, F) and trace elements in pre-eruptive magmas and volcanic gases. An investigation of magma degassing processes on Hekla (Iceland) and Masaya (Nicaragua) volcanoes. Volatils mineurs (S, Cl, F) et éléments traces dans les magmas pré-éruptifs et les gaz volcaniques. Etude des processus de dégazage magmatique sur les volcans Hekla (Islande) et Masaya (Nicaragua). Moune, Séverine Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Blaise Pascal - Clermont-Ferrand II Sigmarsson Olgeir(olgeir@opgc.univ-bpclermont.fr) 2005-12-14 https://tel.archives-ouvertes.fr/tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542/document https://tel.archives-ouvertes.fr/tel-00011542/file/These_Severine_Moune_ter.pdf fr fre HAL CCSD NNT: 2005CLF21627 tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542 https://tel.archives-ouvertes.fr/tel-00011542/document https://tel.archives-ouvertes.fr/tel-00011542/file/These_Severine_Moune_ter.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-00011542 Géochimie. Université Blaise Pascal - Clermont-Ferrand II, 2005. Français. ⟨NNT : 2005CLF21627⟩ Volcanoes Magma degassing Volcanic gases Melt inclusions Trace elements Volatility Sulfur Halogens REE Dissolution of silicate glasses Dissolution de verres silicatés Volcans Dégazage magmatique Gaz volcaniques Inclusions magmatiques Eléments traces Volatilité Soufre Halogènes Terres Rares [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/doctoralThesis Theses 2005 ftccsdartic 2021-10-24T23:46:16Z A study of melt inclusions (MIs) has allowed us to follow the dissolved volatile evolution in the magmatic system of Hekla volcano during the melt differentiation (fractional crystallization). This work has allowed us to predict the “expected” volatile concentrations, which correspond to the volatile contents in the basaltic icelandite melt just prior to eruption. Such approach avoids underestimation of the pre-eruptive volatile contents measured in MIs and improves the estimates on the volatile mass released into the atmosphere. This approach has suggested that the magma carried 0.1 Mt of HCl, 0.2 Mt of HF and 3.8 of SO2 into the atmosphere during the 2000 Hekla eruption. Moreover, the Plinian phase of this eruption emitted a mixed tephra-gas plume that was scavenged by snowstorms, offering the unique opportunity to better study the geochemistry of this explosive gas phase. The study of these snow samples has shown that enrichment of most of volatile trace elements is linked to a degassing process as halides and/or sulfates. More surprisingly, refractory elements are also enriched in the gaseous phase of Hekla and they are best explained by the non-stoechiometric partial dissolution of tephra by F-rich volcanic gases in the eruptive plume. A study based on MIs has confirmed the hypothesis emitted by Walker et al. (1993) in which differentiation of tholeiitic magmas of Masaya occurs at shallow depth from a "dry" magma also characterized by its homogeneous composition. Moreover, chemical and physical characterizations of volcanic aerosols by SEM and chemical analyses of the eruptive phase of Masaya have allowed us to conclude that trace elements are mostly degassed and transported in Masaya's plume as chlorides, but also as sulfates and/or chloro-sulfates. Volatile trace element contribution to the atmosphere has also been estimated showing that the volcanic plume of Masaya is an important source of atmospheric pollution on the regional scale. L'axe principal de cette thèse est la caractérisation des processus ... Doctoral or Postdoctoral Thesis Hekla Iceland Islande Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |