The eastern Jan Mayen microcontinent volcanic margin
The Jan Mayen microcontinent (JMMC) in the NE Atlantic was created through two Cenozoic rift episodes. Originally part of East Greenland, the JMMC rifted from NW Europe during the Early Eocene under extensive magmatism. The eastern margin is conjugate to the Møre-Faeroes volcanic margin. The western...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/49141 2023-05-15T16:03:42+02:00 The eastern Jan Mayen microcontinent volcanic margin Breivik, Asbjørn Johan Mjelde, Rolf Faleide, Jan Inge Murai, Yoshio http://hdl.handle.net/2115/49141 https://doi.org/10.1111/j.1365-246X.2011.05307.x eng eng Blackwell Publishing http://hdl.handle.net/2115/49141 Geophysical Journal International, 188(3): 798-818 http://dx.doi.org/10.1111/j.1365-246X.2011.05307.x The definitive version is available at onlinelibrary.wiley.com Controlled source seismology Continental margins: divergent Oceanic plateaus and microcontinents Large igneous provinces Crustal structure Magma genesis and partial melting 453 article fthokunivhus https://doi.org/10.1111/j.1365-246X.2011.05307.x 2022-11-18T01:02:23Z The Jan Mayen microcontinent (JMMC) in the NE Atlantic was created through two Cenozoic rift episodes. Originally part of East Greenland, the JMMC rifted from NW Europe during the Early Eocene under extensive magmatism. The eastern margin is conjugate to the Møre-Faeroes volcanic margin. The western JMMC margin underwent prolonged extension before it finally separated from East Greenland during the Late Oligocene. Here we present the modelling by forward/inverse ray tracing of two wide-angle seismic profiles acquired using Ocean Bottom Seismometers, across the northern and the southern JMMC. Early Eocene breakup magmatism at the eastern JMMC produced an igneous thickness of 7-9 km in the north, and 12-14 km in the south. While the continent is clear in the north, the southern JMMC appears to be affected by later Icelandic magmatism. Reduced seismic velocity and increased crustal thickness are compatible with continental crust adjacent to the volcanic margin in the south, but the continental presence towards the Iceland shelf is less clear. Our magnetic track off the southern JMMC gives seafloor spreading rates comparable to that of the conjugate Møre Margin. Transition to ultraslow seafloor spreading occurs at ∼43 Ma, indicating onset of major deformation of the JMMC. Calculating the igneous thickness -- mean Vp relationship at the eastern volcanic margin gives the typical positive correlation seen elsewhere on the NE Atlantic margins. The results indicate temperature driven breakup magmatism under passive mantle upwelling, with a maximum mantle temperature anomaly of ∼50℃ in the north and 90-150℃ in the south. Article in Journal/Newspaper East Greenland Greenland Iceland Jan Mayen Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Greenland Jan Mayen Geophysical Journal International 188 3 798 818 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Controlled source seismology Continental margins: divergent Oceanic plateaus and microcontinents Large igneous provinces Crustal structure Magma genesis and partial melting 453 |
spellingShingle |
Controlled source seismology Continental margins: divergent Oceanic plateaus and microcontinents Large igneous provinces Crustal structure Magma genesis and partial melting 453 Breivik, Asbjørn Johan Mjelde, Rolf Faleide, Jan Inge Murai, Yoshio The eastern Jan Mayen microcontinent volcanic margin |
topic_facet |
Controlled source seismology Continental margins: divergent Oceanic plateaus and microcontinents Large igneous provinces Crustal structure Magma genesis and partial melting 453 |
description |
The Jan Mayen microcontinent (JMMC) in the NE Atlantic was created through two Cenozoic rift episodes. Originally part of East Greenland, the JMMC rifted from NW Europe during the Early Eocene under extensive magmatism. The eastern margin is conjugate to the Møre-Faeroes volcanic margin. The western JMMC margin underwent prolonged extension before it finally separated from East Greenland during the Late Oligocene. Here we present the modelling by forward/inverse ray tracing of two wide-angle seismic profiles acquired using Ocean Bottom Seismometers, across the northern and the southern JMMC. Early Eocene breakup magmatism at the eastern JMMC produced an igneous thickness of 7-9 km in the north, and 12-14 km in the south. While the continent is clear in the north, the southern JMMC appears to be affected by later Icelandic magmatism. Reduced seismic velocity and increased crustal thickness are compatible with continental crust adjacent to the volcanic margin in the south, but the continental presence towards the Iceland shelf is less clear. Our magnetic track off the southern JMMC gives seafloor spreading rates comparable to that of the conjugate Møre Margin. Transition to ultraslow seafloor spreading occurs at ∼43 Ma, indicating onset of major deformation of the JMMC. Calculating the igneous thickness -- mean Vp relationship at the eastern volcanic margin gives the typical positive correlation seen elsewhere on the NE Atlantic margins. The results indicate temperature driven breakup magmatism under passive mantle upwelling, with a maximum mantle temperature anomaly of ∼50℃ in the north and 90-150℃ in the south. |
format |
Article in Journal/Newspaper |
author |
Breivik, Asbjørn Johan Mjelde, Rolf Faleide, Jan Inge Murai, Yoshio |
author_facet |
Breivik, Asbjørn Johan Mjelde, Rolf Faleide, Jan Inge Murai, Yoshio |
author_sort |
Breivik, Asbjørn Johan |
title |
The eastern Jan Mayen microcontinent volcanic margin |
title_short |
The eastern Jan Mayen microcontinent volcanic margin |
title_full |
The eastern Jan Mayen microcontinent volcanic margin |
title_fullStr |
The eastern Jan Mayen microcontinent volcanic margin |
title_full_unstemmed |
The eastern Jan Mayen microcontinent volcanic margin |
title_sort |
eastern jan mayen microcontinent volcanic margin |
publisher |
Blackwell Publishing |
url |
http://hdl.handle.net/2115/49141 https://doi.org/10.1111/j.1365-246X.2011.05307.x |
geographic |
Greenland Jan Mayen |
geographic_facet |
Greenland Jan Mayen |
genre |
East Greenland Greenland Iceland Jan Mayen |
genre_facet |
East Greenland Greenland Iceland Jan Mayen |
op_relation |
http://hdl.handle.net/2115/49141 Geophysical Journal International, 188(3): 798-818 http://dx.doi.org/10.1111/j.1365-246X.2011.05307.x |
op_rights |
The definitive version is available at onlinelibrary.wiley.com |
op_doi |
https://doi.org/10.1111/j.1365-246X.2011.05307.x |
container_title |
Geophysical Journal International |
container_volume |
188 |
container_issue |
3 |
container_start_page |
798 |
op_container_end_page |
818 |
_version_ |
1766399395818897408 |