Contrasting conditions of rift and off-rift silicic magma origin on Iceland
Factors controlling the origin of silicic magmas on Iceland are poorly constrained. Here we present new data on H2O content, pressure, temperature, oxygen fugacity, and oxygen isotope composition of rhyolites from Askja, Öræfajökull, and Hekla volcanoes. All these parameters correlate with tectonic...
Published in: | Geophysical Research Letters |
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AGU (American Geophysical Union)
2014
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Online Access: | https://oceanrep.geomar.de/id/eprint/25485/ https://oceanrep.geomar.de/id/eprint/25485/1/Schattel%20et.al.pdf https://doi.org/10.1002/2014GL060780 |
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ftoceanrep:oai:oceanrep.geomar.de:25485 2023-05-15T16:34:01+02:00 Contrasting conditions of rift and off-rift silicic magma origin on Iceland Schattel, Nadine Portnyagin, Maxim Golowin, Roman Hoernle, Kaj Bindeman, Ilya 2014-08-28 text https://oceanrep.geomar.de/id/eprint/25485/ https://oceanrep.geomar.de/id/eprint/25485/1/Schattel%20et.al.pdf https://doi.org/10.1002/2014GL060780 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/25485/1/Schattel%20et.al.pdf Schattel, N., Portnyagin, M. , Golowin, R., Hoernle, K. and Bindeman, I. (2014) Contrasting conditions of rift and off-rift silicic magma origin on Iceland. Open Access Geophysical Research Letters, 41 (16). pp. 5813-5820. DOI 10.1002/2014GL060780 <https://doi.org/10.1002/2014GL060780>. doi:10.1002/2014GL060780 info:eu-repo/semantics/openAccess Article PeerReviewed 2014 ftoceanrep https://doi.org/10.1002/2014GL060780 2023-04-07T15:14:15Z Factors controlling the origin of silicic magmas on Iceland are poorly constrained. Here we present new data on H2O content, pressure, temperature, oxygen fugacity, and oxygen isotope composition of rhyolites from Askja, Öræfajökull, and Hekla volcanoes. All these parameters correlate with tectonic (rift and off-rift) setting of the volcanoes. Askja rift rhyolites originate through extensive assimilation of high-temperature hydrothermally altered crust (δ18O < 2‰) at shallow depths (≥1.8 km). These rhyolites are hot (935–1008°C), relatively dry (H2O < 2.7 wt%), and oxidized (QFM = +1.4). Cooler (874–902°C), wet (H2O = 4-6.3 wt%), and non-oxidized (~QFM to QFM-1) off-rift rhyolites (Öræfajökull, Hekla) originate through differentiation deeper in the crust (≥4 km) with almost no or little assimilation of high-T, altered crust, as reflected by slightly lower to normal δ18O values (5.2–6‰). Although off-rift rhyolites predominate during the Holocene, older silicic rocks on Iceland primarily formed in a rift setting possibly analogous to the oldest continental crust on Earth. Article in Journal/Newspaper Hekla Iceland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Askja ENVELOPE(-16.802,-16.802,65.042,65.042) Geophysical Research Letters 41 16 5813 5820 |
institution |
Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Factors controlling the origin of silicic magmas on Iceland are poorly constrained. Here we present new data on H2O content, pressure, temperature, oxygen fugacity, and oxygen isotope composition of rhyolites from Askja, Öræfajökull, and Hekla volcanoes. All these parameters correlate with tectonic (rift and off-rift) setting of the volcanoes. Askja rift rhyolites originate through extensive assimilation of high-temperature hydrothermally altered crust (δ18O < 2‰) at shallow depths (≥1.8 km). These rhyolites are hot (935–1008°C), relatively dry (H2O < 2.7 wt%), and oxidized (QFM = +1.4). Cooler (874–902°C), wet (H2O = 4-6.3 wt%), and non-oxidized (~QFM to QFM-1) off-rift rhyolites (Öræfajökull, Hekla) originate through differentiation deeper in the crust (≥4 km) with almost no or little assimilation of high-T, altered crust, as reflected by slightly lower to normal δ18O values (5.2–6‰). Although off-rift rhyolites predominate during the Holocene, older silicic rocks on Iceland primarily formed in a rift setting possibly analogous to the oldest continental crust on Earth. |
format |
Article in Journal/Newspaper |
author |
Schattel, Nadine Portnyagin, Maxim Golowin, Roman Hoernle, Kaj Bindeman, Ilya |
spellingShingle |
Schattel, Nadine Portnyagin, Maxim Golowin, Roman Hoernle, Kaj Bindeman, Ilya Contrasting conditions of rift and off-rift silicic magma origin on Iceland |
author_facet |
Schattel, Nadine Portnyagin, Maxim Golowin, Roman Hoernle, Kaj Bindeman, Ilya |
author_sort |
Schattel, Nadine |
title |
Contrasting conditions of rift and off-rift silicic magma origin on Iceland |
title_short |
Contrasting conditions of rift and off-rift silicic magma origin on Iceland |
title_full |
Contrasting conditions of rift and off-rift silicic magma origin on Iceland |
title_fullStr |
Contrasting conditions of rift and off-rift silicic magma origin on Iceland |
title_full_unstemmed |
Contrasting conditions of rift and off-rift silicic magma origin on Iceland |
title_sort |
contrasting conditions of rift and off-rift silicic magma origin on iceland |
publisher |
AGU (American Geophysical Union) |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/25485/ https://oceanrep.geomar.de/id/eprint/25485/1/Schattel%20et.al.pdf https://doi.org/10.1002/2014GL060780 |
long_lat |
ENVELOPE(-16.802,-16.802,65.042,65.042) |
geographic |
Askja |
geographic_facet |
Askja |
genre |
Hekla Iceland |
genre_facet |
Hekla Iceland |
op_relation |
https://oceanrep.geomar.de/id/eprint/25485/1/Schattel%20et.al.pdf Schattel, N., Portnyagin, M. , Golowin, R., Hoernle, K. and Bindeman, I. (2014) Contrasting conditions of rift and off-rift silicic magma origin on Iceland. Open Access Geophysical Research Letters, 41 (16). pp. 5813-5820. DOI 10.1002/2014GL060780 <https://doi.org/10.1002/2014GL060780>. doi:10.1002/2014GL060780 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2014GL060780 |
container_title |
Geophysical Research Letters |
container_volume |
41 |
container_issue |
16 |
container_start_page |
5813 |
op_container_end_page |
5820 |
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1766023777270890496 |