Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes
International audience Pleistocene and Holocene peralkaline rhyolites from Torfajo¨ kull (South Iceland Volcanic Zone) and Ljo´ sufjo¨ ll central volcanoes and trachytes from Snæfellsjo¨ kull (Snæfellsnes Volcanic Zone) allow the assessment of the mechanism for silicic magma genesis as a function of...
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ftunivnantes:oai:HAL:hal-00329576v1 2023-05-15T16:46:50+02:00 Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes Martin, Erwan Sigmarsson, Olgeir Laboratoire Magmas et Volcans (LMV) 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)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) 2007 https://hal.science/hal-00329576 https://doi.org/10.1007/s00410-006-0165-5 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-006-0165-5 hal-00329576 https://hal.science/hal-00329576 doi:10.1007/s00410-006-0165-5 ISSN: 0010-7999 EISSN: 1432-0967 Contributions to Mineralogy and Petrology https://hal.science/hal-00329576 Contributions to Mineralogy and Petrology, 2007, 5, pp.593-605. ⟨10.1007/s00410-006-0165-5⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2007 ftunivnantes https://doi.org/10.1007/s00410-006-0165-5 2023-02-08T04:18:59Z International audience Pleistocene and Holocene peralkaline rhyolites from Torfajo¨ kull (South Iceland Volcanic Zone) and Ljo´ sufjo¨ ll central volcanoes and trachytes from Snæfellsjo¨ kull (Snæfellsnes Volcanic Zone) allow the assessment of the mechanism for silicic magma genesis as a function of geographical location and crustal geothermal gradient. The low d18O (2.4&) and low Sr concentration (12.2 ppm) measured in Torfajo¨ kull rhyolites are best explained by partial melting of hydrated metabasaltic crust followed by major fractionation of feldspar. In contrast, very high 87Sr/86Sr (0.70473) and low Ba (8.7 ppm) and Sr (1.2 ppm) concentrations measured in Ljo´ sufjo¨ ll silicic lavas are best explained by fractional crystallisation and subsequent 87Rb decay. Snæfellsjo¨ kull trachytes are also generated by fractional crystallisation, with less than 10% crustal assimilation, as inferred from their d18O. The fact that silicic magmas within, or close to, the rift zone are principally generated by crustal melting whereas those from off-rift zones are better explained by fractional crystallisation clearly illustrates the controlling influence of the thermal state of the crust on silicic magma genesis in Iceland. Article in Journal/Newspaper Iceland Université de Nantes: HAL-UNIV-NANTES Contributions to Mineralogy and Petrology 153 5 593 605 |
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Université de Nantes: HAL-UNIV-NANTES |
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English |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Martin, Erwan Sigmarsson, Olgeir Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Pleistocene and Holocene peralkaline rhyolites from Torfajo¨ kull (South Iceland Volcanic Zone) and Ljo´ sufjo¨ ll central volcanoes and trachytes from Snæfellsjo¨ kull (Snæfellsnes Volcanic Zone) allow the assessment of the mechanism for silicic magma genesis as a function of geographical location and crustal geothermal gradient. The low d18O (2.4&) and low Sr concentration (12.2 ppm) measured in Torfajo¨ kull rhyolites are best explained by partial melting of hydrated metabasaltic crust followed by major fractionation of feldspar. In contrast, very high 87Sr/86Sr (0.70473) and low Ba (8.7 ppm) and Sr (1.2 ppm) concentrations measured in Ljo´ sufjo¨ ll silicic lavas are best explained by fractional crystallisation and subsequent 87Rb decay. Snæfellsjo¨ kull trachytes are also generated by fractional crystallisation, with less than 10% crustal assimilation, as inferred from their d18O. The fact that silicic magmas within, or close to, the rift zone are principally generated by crustal melting whereas those from off-rift zones are better explained by fractional crystallisation clearly illustrates the controlling influence of the thermal state of the crust on silicic magma genesis in Iceland. |
author2 |
Laboratoire Magmas et Volcans (LMV) 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)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Martin, Erwan Sigmarsson, Olgeir |
author_facet |
Martin, Erwan Sigmarsson, Olgeir |
author_sort |
Martin, Erwan |
title |
Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes |
title_short |
Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes |
title_full |
Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes |
title_fullStr |
Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes |
title_full_unstemmed |
Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajo¨ kull, Ljo´ sufjo¨ ll and Snæfellsjo¨ kull volcanoes |
title_sort |
crustal thermal state and origin of silicic magma in iceland: the case of torfajo¨ kull, ljo´ sufjo¨ ll and snæfellsjo¨ kull volcanoes |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00329576 https://doi.org/10.1007/s00410-006-0165-5 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0010-7999 EISSN: 1432-0967 Contributions to Mineralogy and Petrology https://hal.science/hal-00329576 Contributions to Mineralogy and Petrology, 2007, 5, pp.593-605. ⟨10.1007/s00410-006-0165-5⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-006-0165-5 hal-00329576 https://hal.science/hal-00329576 doi:10.1007/s00410-006-0165-5 |
op_doi |
https://doi.org/10.1007/s00410-006-0165-5 |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
153 |
container_issue |
5 |
container_start_page |
593 |
op_container_end_page |
605 |
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1766036938000695296 |