Tectonics and magma dynamics coupling in a dyke swarm of Iceland
International audience To study the dynamics of dyke and fissure swarms in Iceland, we analyse the distribution of the dykes across the Tertiary Alftafjördur dyke swarm and that of open fissures and faults across the active Krafla fissure swarm. Within these narrow (5 to 10 km wide) and long (length...
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ftunivrennes1hal:oai:HAL:insu-00188286v1 2023-11-12T04:19:07+01:00 Tectonics and magma dynamics coupling in a dyke swarm of Iceland Paquet, Fabien Dauteuil, Olivier Hallot, Erwan Moreau, Frédérique Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) 2007 https://insu.hal.science/insu-00188286 https://doi.org/10.1016/j.jsg.2007.06.001 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2007.06.001 insu-00188286 https://insu.hal.science/insu-00188286 doi:10.1016/j.jsg.2007.06.001 ISSN: 0191-8141 Journal of Structural Geology https://insu.hal.science/insu-00188286 Journal of Structural Geology, 2007, 29 (9), pp.1477-1493. ⟨10.1016/j.jsg.2007.06.001⟩ Dyke swarm Fissure swarm Magma dynamics Extensional tectonics Iceland [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2007 ftunivrennes1hal https://doi.org/10.1016/j.jsg.2007.06.001 2023-10-31T23:48:46Z International audience To study the dynamics of dyke and fissure swarms in Iceland, we analyse the distribution of the dykes across the Tertiary Alftafjördur dyke swarm and that of open fissures and faults across the active Krafla fissure swarm. Within these narrow (5 to 10 km wide) and long (length/width ratio >10) swarms, deformation is accommodated both by tectonics and magmatism. The dyke swarm built during the westward regional tilting of the host-rock lava pile. The populations of dykes suggest that a characteristic thickness at about 3 m is involved during dyking. Dykes show a quasi-periodic distribution across the swarm and form clusters spaced by about 2.5 km. The analysis of the fissure distribution in the Krafla volcanic system reveals a cluster spacing of about half of that of the dyke clusters. We discuss the potential origins of these features as a result of magma dynamics, host-rock properties and tectonics. Clustering possibly reflects the intrinsic mechanical response to stretching of the upper levels of the brittle crust. We propose a three-dimensional model of dyke swarms in which magma likely migrates laterally within the upper crust from igneous centres where high magmatic supply rates locally perturb the regional stress field. Article in Journal/Newspaper Iceland Université de Rennes 1: Publications scientifiques (HAL) Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Journal of Structural Geology 29 9 1477 1493 |
institution |
Open Polar |
collection |
Université de Rennes 1: Publications scientifiques (HAL) |
op_collection_id |
ftunivrennes1hal |
language |
English |
topic |
Dyke swarm Fissure swarm Magma dynamics Extensional tectonics Iceland [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
Dyke swarm Fissure swarm Magma dynamics Extensional tectonics Iceland [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Paquet, Fabien Dauteuil, Olivier Hallot, Erwan Moreau, Frédérique Tectonics and magma dynamics coupling in a dyke swarm of Iceland |
topic_facet |
Dyke swarm Fissure swarm Magma dynamics Extensional tectonics Iceland [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience To study the dynamics of dyke and fissure swarms in Iceland, we analyse the distribution of the dykes across the Tertiary Alftafjördur dyke swarm and that of open fissures and faults across the active Krafla fissure swarm. Within these narrow (5 to 10 km wide) and long (length/width ratio >10) swarms, deformation is accommodated both by tectonics and magmatism. The dyke swarm built during the westward regional tilting of the host-rock lava pile. The populations of dykes suggest that a characteristic thickness at about 3 m is involved during dyking. Dykes show a quasi-periodic distribution across the swarm and form clusters spaced by about 2.5 km. The analysis of the fissure distribution in the Krafla volcanic system reveals a cluster spacing of about half of that of the dyke clusters. We discuss the potential origins of these features as a result of magma dynamics, host-rock properties and tectonics. Clustering possibly reflects the intrinsic mechanical response to stretching of the upper levels of the brittle crust. We propose a three-dimensional model of dyke swarms in which magma likely migrates laterally within the upper crust from igneous centres where high magmatic supply rates locally perturb the regional stress field. |
author2 |
Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Paquet, Fabien Dauteuil, Olivier Hallot, Erwan Moreau, Frédérique |
author_facet |
Paquet, Fabien Dauteuil, Olivier Hallot, Erwan Moreau, Frédérique |
author_sort |
Paquet, Fabien |
title |
Tectonics and magma dynamics coupling in a dyke swarm of Iceland |
title_short |
Tectonics and magma dynamics coupling in a dyke swarm of Iceland |
title_full |
Tectonics and magma dynamics coupling in a dyke swarm of Iceland |
title_fullStr |
Tectonics and magma dynamics coupling in a dyke swarm of Iceland |
title_full_unstemmed |
Tectonics and magma dynamics coupling in a dyke swarm of Iceland |
title_sort |
tectonics and magma dynamics coupling in a dyke swarm of iceland |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-00188286 https://doi.org/10.1016/j.jsg.2007.06.001 |
long_lat |
ENVELOPE(-16.747,-16.747,65.713,65.713) ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Krafla Tilting |
geographic_facet |
Krafla Tilting |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0191-8141 Journal of Structural Geology https://insu.hal.science/insu-00188286 Journal of Structural Geology, 2007, 29 (9), pp.1477-1493. ⟨10.1016/j.jsg.2007.06.001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2007.06.001 insu-00188286 https://insu.hal.science/insu-00188286 doi:10.1016/j.jsg.2007.06.001 |
op_doi |
https://doi.org/10.1016/j.jsg.2007.06.001 |
container_title |
Journal of Structural Geology |
container_volume |
29 |
container_issue |
9 |
container_start_page |
1477 |
op_container_end_page |
1493 |
_version_ |
1782335628997820416 |