Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea
Using a new high-resolution aeromagnetic survey (JAS-05) that was acquired along the trend of the Jan Mayen Fracture Zone (JMFZ), west of the Vøring volcanic margin, we investigated the geodynamic framework of the early spreading evolution of the Norwegian-Greenland Sea. The tectonic structure, main...
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ftqueensland:oai:eprints.qut.edu.au:234238 2024-04-28T08:17:29+00:00 Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea Gernigon, Laurent Olesen, Odleiv Ebbing, Jörg Wienecke, Susann Gaina, Carmen Mogaard, John Olav Sand, Morten Myklebust, Reidun 2009-04-01 https://eprints.qut.edu.au/234238/ unknown Elsevier doi:10.1016/j.tecto.2008.04.025 Gernigon, Laurent, Olesen, Odleiv, Ebbing, Jörg, Wienecke, Susann, Gaina, Carmen, Mogaard, John Olav, Sand, Morten, & Myklebust, Reidun (2009) Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea. Tectonophysics, 468(1-4), pp. 185-205. https://eprints.qut.edu.au/234238/ Crown copyright 2008 This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Tectonophysics Aeromagnetic Breakup Jan Mayen Fracture Zone Oceanic crust Triple junction Volcanic margin Contribution to Journal 2009 ftqueensland https://doi.org/10.1016/j.tecto.2008.04.025 2024-04-10T00:20:36Z Using a new high-resolution aeromagnetic survey (JAS-05) that was acquired along the trend of the Jan Mayen Fracture Zone (JMFZ), west of the Vøring volcanic margin, we investigated the geodynamic framework of the early spreading evolution of the Norwegian-Greenland Sea. The tectonic structure, main faults and magnetic chrons have been reinterpreted based on new magnetic gridded data and integrated with bathymetry, gravity and seismic data. The new interpretation reveals more details about the early spreading history of the Norwegian-Greenland Sea in the vicinity of the JMFZ. Although anomalous melt production (seaward-dipping reflectors, underplating) associated with the breakup of the Mid-Norwegian margin has been described in many studies, we present data that suggest that significant magmatism continued episodically during the opening of the Norwegian-Greenland Sea along the trend of the JMFZ. The Vøring Spur (VS), an anomalous oceanic high, lying north of the eastern segment of the JMFZ exhibits a contrasting Bouguer gravity low and a complex magnetic signature. The gravity signature of the VS can be modelled and explained as an abnormal thick oceanic crust, which locally can reach up to 15 km. We propose that the thick oceanic crust (overcrusting) was syn-rift and formed during Mid- to Late Eocene. A plate reconstruction at Eocene time suggests that the VS could be part of a triple junction initiated during the breakup between the Vøring Marginal High and the Greenland part of the Traill-Vøring igneous complex, now located offshore East Greenland. Mantle upwelling beneath the early spreading ridge and/or local stress reorganisation could have induced transtension and lithospheric thinning along the JMFZ and magmatic activity would have increased locally along this 'leaky transform'. We suggest that the Early Tertiary tectono-magmatic processes that operated in the Norwegian-Greenland Sea are similar to the processes involved in the modern triple junction evolution of the Azores Plateau region. Crown Article in Journal/Newspaper East Greenland Greenland Greenland Sea Jan Mayen Queensland University of Technology: QUT ePrints Tectonophysics 468 1-4 185 205 |
institution |
Open Polar |
collection |
Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
Aeromagnetic Breakup Jan Mayen Fracture Zone Oceanic crust Triple junction Volcanic margin |
spellingShingle |
Aeromagnetic Breakup Jan Mayen Fracture Zone Oceanic crust Triple junction Volcanic margin Gernigon, Laurent Olesen, Odleiv Ebbing, Jörg Wienecke, Susann Gaina, Carmen Mogaard, John Olav Sand, Morten Myklebust, Reidun Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea |
topic_facet |
Aeromagnetic Breakup Jan Mayen Fracture Zone Oceanic crust Triple junction Volcanic margin |
description |
Using a new high-resolution aeromagnetic survey (JAS-05) that was acquired along the trend of the Jan Mayen Fracture Zone (JMFZ), west of the Vøring volcanic margin, we investigated the geodynamic framework of the early spreading evolution of the Norwegian-Greenland Sea. The tectonic structure, main faults and magnetic chrons have been reinterpreted based on new magnetic gridded data and integrated with bathymetry, gravity and seismic data. The new interpretation reveals more details about the early spreading history of the Norwegian-Greenland Sea in the vicinity of the JMFZ. Although anomalous melt production (seaward-dipping reflectors, underplating) associated with the breakup of the Mid-Norwegian margin has been described in many studies, we present data that suggest that significant magmatism continued episodically during the opening of the Norwegian-Greenland Sea along the trend of the JMFZ. The Vøring Spur (VS), an anomalous oceanic high, lying north of the eastern segment of the JMFZ exhibits a contrasting Bouguer gravity low and a complex magnetic signature. The gravity signature of the VS can be modelled and explained as an abnormal thick oceanic crust, which locally can reach up to 15 km. We propose that the thick oceanic crust (overcrusting) was syn-rift and formed during Mid- to Late Eocene. A plate reconstruction at Eocene time suggests that the VS could be part of a triple junction initiated during the breakup between the Vøring Marginal High and the Greenland part of the Traill-Vøring igneous complex, now located offshore East Greenland. Mantle upwelling beneath the early spreading ridge and/or local stress reorganisation could have induced transtension and lithospheric thinning along the JMFZ and magmatic activity would have increased locally along this 'leaky transform'. We suggest that the Early Tertiary tectono-magmatic processes that operated in the Norwegian-Greenland Sea are similar to the processes involved in the modern triple junction evolution of the Azores Plateau region. Crown |
format |
Article in Journal/Newspaper |
author |
Gernigon, Laurent Olesen, Odleiv Ebbing, Jörg Wienecke, Susann Gaina, Carmen Mogaard, John Olav Sand, Morten Myklebust, Reidun |
author_facet |
Gernigon, Laurent Olesen, Odleiv Ebbing, Jörg Wienecke, Susann Gaina, Carmen Mogaard, John Olav Sand, Morten Myklebust, Reidun |
author_sort |
Gernigon, Laurent |
title |
Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea |
title_short |
Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea |
title_full |
Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea |
title_fullStr |
Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea |
title_full_unstemmed |
Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea |
title_sort |
geophysical insights and early spreading history in the vicinity of the jan mayen fracture zone, norwegian-greenland sea |
publisher |
Elsevier |
publishDate |
2009 |
url |
https://eprints.qut.edu.au/234238/ |
genre |
East Greenland Greenland Greenland Sea Jan Mayen |
genre_facet |
East Greenland Greenland Greenland Sea Jan Mayen |
op_source |
Tectonophysics |
op_relation |
doi:10.1016/j.tecto.2008.04.025 Gernigon, Laurent, Olesen, Odleiv, Ebbing, Jörg, Wienecke, Susann, Gaina, Carmen, Mogaard, John Olav, Sand, Morten, & Myklebust, Reidun (2009) Geophysical insights and early spreading history in the vicinity of the Jan Mayen Fracture Zone, Norwegian-Greenland Sea. Tectonophysics, 468(1-4), pp. 185-205. https://eprints.qut.edu.au/234238/ |
op_rights |
Crown copyright 2008 This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1016/j.tecto.2008.04.025 |
container_title |
Tectonophysics |
container_volume |
468 |
container_issue |
1-4 |
container_start_page |
185 |
op_container_end_page |
205 |
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1797582046886887424 |