Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data
The breakup of the Northeast Atlantic in the Early Eocene was magma-rich, forming the major part of the North Atlantic Igneous Province (NAIP). This is seen as extrusive and intrusive magmatism in the continental domain, and as a thicker than normal oceanic crust produced the first few million years...
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ftoceanrep:oai:oceanrep.geomar.de:25565 2023-05-15T16:03:55+02:00 Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data Breivik, Asbjorn J. Faleide, Jan Inge Mjelde, Rolf Murai, Yoshio Flueh, Ernst R. 2014 https://oceanrep.geomar.de/id/eprint/25565/ unknown Breivik, A. J., Faleide, J. I., Mjelde, R., Murai, Y. and Flueh, E. R. (2014) Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data. [Talk] In: AGU Fall Meeting 2014. , 15.-19.12.2014, San Francisco, USA . Conference or Workshop Item NonPeerReviewed 2014 ftoceanrep 2023-04-07T15:14:15Z The breakup of the Northeast Atlantic in the Early Eocene was magma-rich, forming the major part of the North Atlantic Igneous Province (NAIP). This is seen as extrusive and intrusive magmatism in the continental domain, and as a thicker than normal oceanic crust produced the first few million years after continental breakup. The maximum magma productivity and the duration of excess magmatism varies along the margins of Northwest Europe and East Greenland, to some extent as a function of the distance from the Iceland hotspot. The Vøring Plateau off mid-Norway is the northernmost of the margin segments in northwestern Europe with extensive magmatism. North of the plateau, magmatism dies off towards the Lofoten Margin, marking the northern boundary of the NAIP here. In 2003, as part of the Euromargins Program we collected an Ocean Bottom Seismometer (OBS) profile from mainland Norway, across the Lofoten Islands, and out into the deep ocean. Forward velocity modeling using raytracing reveals a continental margin that shows transitional features between magma-rich and magma-poor rifting. On one hand, we detect an up to 2 km thick and 40-50 km wide magmatic underplate of the outer continent, on the other hand, continental thinning is greater and intrusive magmatism less than farther south. Continental breakup also appears to be somewhat delayed compared to breakup on the Vøring Plateau, consistent with increased extension. This indicates that magmatic diking, believed to quickly lead to continental breakup of volcanic margins and thus to reduce continental thinning, played a much lesser role here than at the plateau. Early post-breakup oceanic crust is up to 8 km thick, less than half of that observed farther south. The most likely interpretation of these observations, is that the source for the excess magmatism of the NAIP was not present at the Lofoten Margin during rifting, and that the excess magmatism actually observed was the result of lateral transport from the south around breakup time. Conference Object East Greenland Greenland Iceland Lofoten North Atlantic Northeast Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Lofoten Norway Vøring Plateau ENVELOPE(4.000,4.000,67.000,67.000) |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
unknown |
description |
The breakup of the Northeast Atlantic in the Early Eocene was magma-rich, forming the major part of the North Atlantic Igneous Province (NAIP). This is seen as extrusive and intrusive magmatism in the continental domain, and as a thicker than normal oceanic crust produced the first few million years after continental breakup. The maximum magma productivity and the duration of excess magmatism varies along the margins of Northwest Europe and East Greenland, to some extent as a function of the distance from the Iceland hotspot. The Vøring Plateau off mid-Norway is the northernmost of the margin segments in northwestern Europe with extensive magmatism. North of the plateau, magmatism dies off towards the Lofoten Margin, marking the northern boundary of the NAIP here. In 2003, as part of the Euromargins Program we collected an Ocean Bottom Seismometer (OBS) profile from mainland Norway, across the Lofoten Islands, and out into the deep ocean. Forward velocity modeling using raytracing reveals a continental margin that shows transitional features between magma-rich and magma-poor rifting. On one hand, we detect an up to 2 km thick and 40-50 km wide magmatic underplate of the outer continent, on the other hand, continental thinning is greater and intrusive magmatism less than farther south. Continental breakup also appears to be somewhat delayed compared to breakup on the Vøring Plateau, consistent with increased extension. This indicates that magmatic diking, believed to quickly lead to continental breakup of volcanic margins and thus to reduce continental thinning, played a much lesser role here than at the plateau. Early post-breakup oceanic crust is up to 8 km thick, less than half of that observed farther south. The most likely interpretation of these observations, is that the source for the excess magmatism of the NAIP was not present at the Lofoten Margin during rifting, and that the excess magmatism actually observed was the result of lateral transport from the south around breakup time. |
format |
Conference Object |
author |
Breivik, Asbjorn J. Faleide, Jan Inge Mjelde, Rolf Murai, Yoshio Flueh, Ernst R. |
spellingShingle |
Breivik, Asbjorn J. Faleide, Jan Inge Mjelde, Rolf Murai, Yoshio Flueh, Ernst R. Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data |
author_facet |
Breivik, Asbjorn J. Faleide, Jan Inge Mjelde, Rolf Murai, Yoshio Flueh, Ernst R. |
author_sort |
Breivik, Asbjorn J. |
title |
Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data |
title_short |
Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data |
title_full |
Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data |
title_fullStr |
Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data |
title_full_unstemmed |
Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data |
title_sort |
breakup style and magmatic underplating west of the lofoten islands, norway, based on obs data |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/25565/ |
long_lat |
ENVELOPE(4.000,4.000,67.000,67.000) |
geographic |
Greenland Lofoten Norway Vøring Plateau |
geographic_facet |
Greenland Lofoten Norway Vøring Plateau |
genre |
East Greenland Greenland Iceland Lofoten North Atlantic Northeast Atlantic |
genre_facet |
East Greenland Greenland Iceland Lofoten North Atlantic Northeast Atlantic |
op_relation |
Breivik, A. J., Faleide, J. I., Mjelde, R., Murai, Y. and Flueh, E. R. (2014) Breakup Style and Magmatic Underplating West of the Lofoten Islands, Norway, Based on OBS Data. [Talk] In: AGU Fall Meeting 2014. , 15.-19.12.2014, San Francisco, USA . |
_version_ |
1766399616206503936 |