Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot
We combine new and published 40 Ar/ 39 Ar age determinations from incremental heating experiments on whole rocks and mineral separates to assess the timing, duration and distribution of volcanic activity during construction of the North Atlantic Igneous Province. We use these ages together with volu...
Published in: | Chemical Geology |
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Language: | English |
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2007
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Online Access: | https://forskning.ruc.dk/da/publications/817d8f00-a3e5-11dc-af2d-000ea68e967b https://doi.org/10.1016/j.chemgeo.2007.01.016 https://hdl.handle.net/1800/817d8f00-a3e5-11dc-af2d-000ea68e967b |
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fturoskildefispu:oai:pure.atira.dk:publications/817d8f00-a3e5-11dc-af2d-000ea68e967b 2023-05-15T15:35:28+02:00 Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot Storey, Michael Duncan, Robert A. Tegner, Christian 2007 https://forskning.ruc.dk/da/publications/817d8f00-a3e5-11dc-af2d-000ea68e967b https://doi.org/10.1016/j.chemgeo.2007.01.016 https://hdl.handle.net/1800/817d8f00-a3e5-11dc-af2d-000ea68e967b eng eng info:eu-repo/semantics/restrictedAccess Storey , M , Duncan , R A & Tegner , C 2007 , ' Timing and duration of volcanism in the North Atlantic Igneous Province : Implications for geodynamics and links to the Iceland hotspot ' , Chemical Geology , vol. 241 , no. 3-4 , pp. 264-281 . https://doi.org/10.1016/j.chemgeo.2007.01.016 Large igneous provinces Mantle plumes Iceland hotspot article 2007 fturoskildefispu https://doi.org/10.1016/j.chemgeo.2007.01.016 2022-12-21T23:51:20Z We combine new and published 40 Ar/ 39 Ar age determinations from incremental heating experiments on whole rocks and mineral separates to assess the timing, duration and distribution of volcanic activity during construction of the North Atlantic Igneous Province. We use these ages together with volume estimates of erupted magmas and their cumulates to calculate melt production rates for the early Tertiary flood basalts of East Greenland and the Faeroes Islands. The lavas lie at opposite ends of the Greenland-Iceland-Faeroes Ridge, the postulated Iceland hotspot track, and record volcanic activity leading up to, during and following continental breakup between Greenland and Europe. Dominantly basaltic (but also alkalic and picritic) magmas were erupted from beneath thick continental lithosphere simultaneously, at 61 Ma, from Baffin Island, to the western and eastern margins of Greenland, to the Faeroe Islands and the western British Isles, a roughly circular area 2000 km in diameter. Volcanic activity was increasingly intermittent by 57-56 Ma, but at 56.1 ± 0.5 Ma the average melt production rate increased by more than an order of magnitude over previous levels (from < 200 to > 3000 km 3 /km of rift/my), coinciding with continental rifting and shallow decompressional melting of the mantle that fed subaerial volcanic activity along most of the eastern margin of Greenland and its complement on the northwestern European margin. Offshore, abnormally thick oceanic crust was produced along the line of plate separation. The upper part of this crust comprises seismically imaged, seaward-dipping, subaerially erupted lavas. By 50 Ma, eruption rates had diminished drastically and volcanic activity had narrowed to a much restricted portion of the East Greenland margin, at the western end of the Greenland-Iceland ridge, that subsequently connected in an age-progressive trend to present hotspot activity in southeastern Iceland. The startup mantle plume head and tail model, with moderate excess temperature (Δ T ~ 100 °C) ... Article in Journal/Newspaper Baffin Island Baffin East Greenland Greenland Iceland North Atlantic Roskilde University Research Portal (RUC) Baffin Island Greenland Chemical Geology 241 3-4 264 281 |
institution |
Open Polar |
collection |
Roskilde University Research Portal (RUC) |
op_collection_id |
fturoskildefispu |
language |
English |
topic |
Large igneous provinces Mantle plumes Iceland hotspot |
spellingShingle |
Large igneous provinces Mantle plumes Iceland hotspot Storey, Michael Duncan, Robert A. Tegner, Christian Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot |
topic_facet |
Large igneous provinces Mantle plumes Iceland hotspot |
description |
We combine new and published 40 Ar/ 39 Ar age determinations from incremental heating experiments on whole rocks and mineral separates to assess the timing, duration and distribution of volcanic activity during construction of the North Atlantic Igneous Province. We use these ages together with volume estimates of erupted magmas and their cumulates to calculate melt production rates for the early Tertiary flood basalts of East Greenland and the Faeroes Islands. The lavas lie at opposite ends of the Greenland-Iceland-Faeroes Ridge, the postulated Iceland hotspot track, and record volcanic activity leading up to, during and following continental breakup between Greenland and Europe. Dominantly basaltic (but also alkalic and picritic) magmas were erupted from beneath thick continental lithosphere simultaneously, at 61 Ma, from Baffin Island, to the western and eastern margins of Greenland, to the Faeroe Islands and the western British Isles, a roughly circular area 2000 km in diameter. Volcanic activity was increasingly intermittent by 57-56 Ma, but at 56.1 ± 0.5 Ma the average melt production rate increased by more than an order of magnitude over previous levels (from < 200 to > 3000 km 3 /km of rift/my), coinciding with continental rifting and shallow decompressional melting of the mantle that fed subaerial volcanic activity along most of the eastern margin of Greenland and its complement on the northwestern European margin. Offshore, abnormally thick oceanic crust was produced along the line of plate separation. The upper part of this crust comprises seismically imaged, seaward-dipping, subaerially erupted lavas. By 50 Ma, eruption rates had diminished drastically and volcanic activity had narrowed to a much restricted portion of the East Greenland margin, at the western end of the Greenland-Iceland ridge, that subsequently connected in an age-progressive trend to present hotspot activity in southeastern Iceland. The startup mantle plume head and tail model, with moderate excess temperature (Δ T ~ 100 °C) ... |
format |
Article in Journal/Newspaper |
author |
Storey, Michael Duncan, Robert A. Tegner, Christian |
author_facet |
Storey, Michael Duncan, Robert A. Tegner, Christian |
author_sort |
Storey, Michael |
title |
Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot |
title_short |
Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot |
title_full |
Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot |
title_fullStr |
Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot |
title_full_unstemmed |
Timing and duration of volcanism in the North Atlantic Igneous Province:Implications for geodynamics and links to the Iceland hotspot |
title_sort |
timing and duration of volcanism in the north atlantic igneous province:implications for geodynamics and links to the iceland hotspot |
publishDate |
2007 |
url |
https://forskning.ruc.dk/da/publications/817d8f00-a3e5-11dc-af2d-000ea68e967b https://doi.org/10.1016/j.chemgeo.2007.01.016 https://hdl.handle.net/1800/817d8f00-a3e5-11dc-af2d-000ea68e967b |
geographic |
Baffin Island Greenland |
geographic_facet |
Baffin Island Greenland |
genre |
Baffin Island Baffin East Greenland Greenland Iceland North Atlantic |
genre_facet |
Baffin Island Baffin East Greenland Greenland Iceland North Atlantic |
op_source |
Storey , M , Duncan , R A & Tegner , C 2007 , ' Timing and duration of volcanism in the North Atlantic Igneous Province : Implications for geodynamics and links to the Iceland hotspot ' , Chemical Geology , vol. 241 , no. 3-4 , pp. 264-281 . https://doi.org/10.1016/j.chemgeo.2007.01.016 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.chemgeo.2007.01.016 |
container_title |
Chemical Geology |
container_volume |
241 |
container_issue |
3-4 |
container_start_page |
264 |
op_container_end_page |
281 |
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1766365808064200704 |