Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland
Recent rifting episodes highlight the role of magmatic systems with propagating dikes on crustal spreading. However, our knowledge of magmatic systems is usually limited to surface observations of andgeophysical data. Eastern Iceland allows direct access to extinct and eroded deeper magmatic systems...
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ftuniperugiairis:oai:research.unipg.it:11391/1389760 2024-04-14T08:13:34+00:00 Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland Urbani, S Trippanera, D. Porreca, Massimiliano Kissel, C. Acocella, V. Urbani, S Trippanera, D. Porreca, Massimiliano Kissel, C. Acocella, V. 2015 STAMPA http://hdl.handle.net/11391/1389760 https://doi.org/10.1002/2015GL065087 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000360414900022 volume:42 issue:15 firstpage:6306 lastpage:6313 numberofpages:8 journal:GEOPHYSICAL RESEARCH LETTERS http://hdl.handle.net/11391/1389760 doi:10.1002/2015GL065087 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84940447408 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 dike magmatic system rift Earth and Planetary Sciences (all) Geophysics info:eu-repo/semantics/article 2015 ftuniperugiairis https://doi.org/10.1002/2015GL065087 2024-03-21T15:52:08Z Recent rifting episodes highlight the role of magmatic systems with propagating dikes on crustal spreading. However, our knowledge of magmatic systems is usually limited to surface observations of andgeophysical data. Eastern Iceland allows direct access to extinct and eroded deeper magmatic systems. Here we collected field structural and AMS (anisotropy of magnetic susceptibility) data on 187 and 19 dikes, respectively, in the 10–12 Ma old Alftafjordur magmatic system. At a paleodepth of ~1.5 km, the extension due to diking is at least 1–2 orders of magnitude larger than that induced by regional tectonics, confirming magmatism as the key mechanism for crustal spreading. This magma-induced extension, inferred from the aspect ratio of the magmatic system, was of ~8 mm/yr, lower than the present one. AMS data suggest that most of dikes have geometrically normal fabric, at least at the margins, consistent with prevalent subvertical magmaflow and propagation Article in Journal/Newspaper Iceland IRIS Università degli Studi di Perugia Geophysical Research Letters 42 15 6306 6313 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Perugia |
op_collection_id |
ftuniperugiairis |
language |
English |
topic |
dike magmatic system rift Earth and Planetary Sciences (all) Geophysics |
spellingShingle |
dike magmatic system rift Earth and Planetary Sciences (all) Geophysics Urbani, S Trippanera, D. Porreca, Massimiliano Kissel, C. Acocella, V. Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland |
topic_facet |
dike magmatic system rift Earth and Planetary Sciences (all) Geophysics |
description |
Recent rifting episodes highlight the role of magmatic systems with propagating dikes on crustal spreading. However, our knowledge of magmatic systems is usually limited to surface observations of andgeophysical data. Eastern Iceland allows direct access to extinct and eroded deeper magmatic systems. Here we collected field structural and AMS (anisotropy of magnetic susceptibility) data on 187 and 19 dikes, respectively, in the 10–12 Ma old Alftafjordur magmatic system. At a paleodepth of ~1.5 km, the extension due to diking is at least 1–2 orders of magnitude larger than that induced by regional tectonics, confirming magmatism as the key mechanism for crustal spreading. This magma-induced extension, inferred from the aspect ratio of the magmatic system, was of ~8 mm/yr, lower than the present one. AMS data suggest that most of dikes have geometrically normal fabric, at least at the margins, consistent with prevalent subvertical magmaflow and propagation |
author2 |
Urbani, S Trippanera, D. Porreca, Massimiliano Kissel, C. Acocella, V. |
format |
Article in Journal/Newspaper |
author |
Urbani, S Trippanera, D. Porreca, Massimiliano Kissel, C. Acocella, V. |
author_facet |
Urbani, S Trippanera, D. Porreca, Massimiliano Kissel, C. Acocella, V. |
author_sort |
Urbani, S |
title |
Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland |
title_short |
Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland |
title_full |
Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland |
title_fullStr |
Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland |
title_full_unstemmed |
Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland |
title_sort |
anatomy of an extinct magmatic system along a divergent plate boundary: alftafjordur, iceland |
publishDate |
2015 |
url |
http://hdl.handle.net/11391/1389760 https://doi.org/10.1002/2015GL065087 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000360414900022 volume:42 issue:15 firstpage:6306 lastpage:6313 numberofpages:8 journal:GEOPHYSICAL RESEARCH LETTERS http://hdl.handle.net/11391/1389760 doi:10.1002/2015GL065087 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84940447408 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-8007/issues?year=2012 |
op_doi |
https://doi.org/10.1002/2015GL065087 |
container_title |
Geophysical Research Letters |
container_volume |
42 |
container_issue |
15 |
container_start_page |
6306 |
op_container_end_page |
6313 |
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1796311583380471808 |