Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland
Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection data and extensive outcrops give unparalleled constraints on mafic intrusi...
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ftunivbergen:oai:bora.uib.no:11250/2835030 2023-05-15T16:03:39+02:00 Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland Eide, Christian Haug Schofield, Nick Howell, John Anthony Jerram, Dougal Alexander 2021 application/pdf https://hdl.handle.net/11250/2835030 https://doi.org/10.1144/jgs2021-043 eng eng Geological Society of London Norges forskningsråd: 193059 Norges forskningsråd: 267689 Norges forskningsråd: 223272 urn:issn:0016-7649 https://hdl.handle.net/11250/2835030 https://doi.org/10.1144/jgs2021-043 cristin:1960137 Journal of the Geological Society. 2021 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2021 The Author(s) Journal of the Geological Society Journal article Peer reviewed 2021 ftunivbergen https://doi.org/10.1144/jgs2021-043 2023-03-14T17:39:17Z Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection data and extensive outcrops give unparalleled constraints on mafic intrusions down to 15 km. This dataset shows how sill-complexes develop and how magma is transported from the mantle through sedimentary basins. The feeder zone of the sill-complex is a narrow zone below a basin, where a magmatic underplate body impinges on thinned crust. Magma is transported through the crystalline crust through dykes. Seismic data and published geochemistry indicate that magma is supplied from a magmatic underplate without perceptible storage in crustal magma chambers and crustal assimilation. As magma enters the sedimentary basin, it forms distributed, bowl-shaped sill-complexes throughout the basin. Large magma volumes in sills (4–20 times larger than the Skaergaard Intrusion) and the presence of few dykes highlight the importance of sills in crustal magma transport. On scales smaller than 0.2 km, host-rock lithology, and particularly mudstone tensile strength anisotropy, controls sill architecture in the upper 10 km of the basin, whereas sills are bowl-shaped below the brittle–ductile transition zone. On scales of kilometres and towards basin margins, tectonic stresses and lateral lithological changes dominate architecture of sills. acceptedVersion Article in Journal/Newspaper East Greenland Greenland University of Bergen: Bergen Open Research Archive (BORA-UiB) Greenland Jameson Land ENVELOPE(-23.500,-23.500,71.167,71.167) Journal of the Geological Society 179 3 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection data and extensive outcrops give unparalleled constraints on mafic intrusions down to 15 km. This dataset shows how sill-complexes develop and how magma is transported from the mantle through sedimentary basins. The feeder zone of the sill-complex is a narrow zone below a basin, where a magmatic underplate body impinges on thinned crust. Magma is transported through the crystalline crust through dykes. Seismic data and published geochemistry indicate that magma is supplied from a magmatic underplate without perceptible storage in crustal magma chambers and crustal assimilation. As magma enters the sedimentary basin, it forms distributed, bowl-shaped sill-complexes throughout the basin. Large magma volumes in sills (4–20 times larger than the Skaergaard Intrusion) and the presence of few dykes highlight the importance of sills in crustal magma transport. On scales smaller than 0.2 km, host-rock lithology, and particularly mudstone tensile strength anisotropy, controls sill architecture in the upper 10 km of the basin, whereas sills are bowl-shaped below the brittle–ductile transition zone. On scales of kilometres and towards basin margins, tectonic stresses and lateral lithological changes dominate architecture of sills. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Eide, Christian Haug Schofield, Nick Howell, John Anthony Jerram, Dougal Alexander |
spellingShingle |
Eide, Christian Haug Schofield, Nick Howell, John Anthony Jerram, Dougal Alexander Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland |
author_facet |
Eide, Christian Haug Schofield, Nick Howell, John Anthony Jerram, Dougal Alexander |
author_sort |
Eide, Christian Haug |
title |
Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland |
title_short |
Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland |
title_full |
Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland |
title_fullStr |
Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland |
title_full_unstemmed |
Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland |
title_sort |
transport of mafic magma through the crust and sedimentary basins: jameson land, east greenland |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2835030 https://doi.org/10.1144/jgs2021-043 |
long_lat |
ENVELOPE(-23.500,-23.500,71.167,71.167) |
geographic |
Greenland Jameson Land |
geographic_facet |
Greenland Jameson Land |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Journal of the Geological Society |
op_relation |
Norges forskningsråd: 193059 Norges forskningsråd: 267689 Norges forskningsråd: 223272 urn:issn:0016-7649 https://hdl.handle.net/11250/2835030 https://doi.org/10.1144/jgs2021-043 cristin:1960137 Journal of the Geological Society. 2021 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1144/jgs2021-043 |
container_title |
Journal of the Geological Society |
container_volume |
179 |
container_issue |
3 |
_version_ |
1766399355987689472 |