Continental crust beneath southeast Iceland
The magmatic activity (0-16 Ma) in Iceland is linked to a deep mantle plume that has been active for the past 62 My. Icelandic and northeast Atlantic basalts contain variable proportions of two enriched components, interpreted as recycled oceanic crust supplied by the plume, and subcontinental litho...
Published in: | Proceedings of the National Academy of Sciences |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://researchers.mq.edu.au/en/publications/fbdc6642-3267-42c5-997f-e053805792fc https://doi.org/10.1073/pnas.1423099112 http://www.scopus.com/inward/record.url?scp=84928154834&partnerID=8YFLogxK |
id |
ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/fbdc6642-3267-42c5-997f-e053805792fc |
---|---|
record_format |
openpolar |
spelling |
ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/fbdc6642-3267-42c5-997f-e053805792fc 2024-06-16T07:39:40+00:00 Continental crust beneath southeast Iceland Torsvik, Trond H. Amundsen, Hans E F Trønnes, Reidar G. Doubrovine, Pavel V. Gaina, Carmen Kusznir, Nick J. Steinberger, Bernhard Corfu, Fernando Ashwal, Lewis D. Griffin, William L. Werner, Stephanie C. Jamtveit, Bjørn 2015-04-14 https://researchers.mq.edu.au/en/publications/fbdc6642-3267-42c5-997f-e053805792fc https://doi.org/10.1073/pnas.1423099112 http://www.scopus.com/inward/record.url?scp=84928154834&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Torsvik , T H , Amundsen , H E F , Trønnes , R G , Doubrovine , P V , Gaina , C , Kusznir , N J , Steinberger , B , Corfu , F , Ashwal , L D , Griffin , W L , Werner , S C & Jamtveit , B 2015 , ' Continental crust beneath southeast Iceland ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 112 , no. 15 , pp. E1818-E1827 . https://doi.org/10.1073/pnas.1423099112 article 2015 ftmacquarieunicr https://doi.org/10.1073/pnas.1423099112 2024-05-22T23:48:02Z The magmatic activity (0-16 Ma) in Iceland is linked to a deep mantle plume that has been active for the past 62 My. Icelandic and northeast Atlantic basalts contain variable proportions of two enriched components, interpreted as recycled oceanic crust supplied by the plume, and subcontinental lithospheric mantle derived from the nearby continental margins. A restricted area in southeast Iceland - and especially the Öræfajökull volcano - is characterized by a unique enriched-mantle component (EM2-like) with elevated 87 Sr/ 86 Sr and 207 Pb/ 204 Pb. Here, we demonstrate through modeling of Sr-Nd- Pb abundances and isotope ratios that the primitive Öræfajökull melts could have assimilated 2-6% of underlying continental crust before differentiating to more evolved melts. From inversion of gravity anomaly data (crustal thickness), analysis of regional magnetic data, and plate reconstructions, we propose that continental crust beneath southeast Iceland is part of ∼350-km-long and 70-km-wide extension of the Jan Mayen Microcontinent (JMM). The extended JMM was marginal to East Greenland but detached in the Early Eocene (between 52 and 47 Mya); by the Oligocene (27 Mya), all parts of the JMM permanently became part of the Eurasian plate following a westward ridge jump in the direction of the Iceland plume. Article in Journal/Newspaper East Greenland Greenland Iceland Jan Mayen Northeast Atlantic Macquarie University Research Portal Greenland Jan Mayen Proceedings of the National Academy of Sciences 112 15 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
description |
The magmatic activity (0-16 Ma) in Iceland is linked to a deep mantle plume that has been active for the past 62 My. Icelandic and northeast Atlantic basalts contain variable proportions of two enriched components, interpreted as recycled oceanic crust supplied by the plume, and subcontinental lithospheric mantle derived from the nearby continental margins. A restricted area in southeast Iceland - and especially the Öræfajökull volcano - is characterized by a unique enriched-mantle component (EM2-like) with elevated 87 Sr/ 86 Sr and 207 Pb/ 204 Pb. Here, we demonstrate through modeling of Sr-Nd- Pb abundances and isotope ratios that the primitive Öræfajökull melts could have assimilated 2-6% of underlying continental crust before differentiating to more evolved melts. From inversion of gravity anomaly data (crustal thickness), analysis of regional magnetic data, and plate reconstructions, we propose that continental crust beneath southeast Iceland is part of ∼350-km-long and 70-km-wide extension of the Jan Mayen Microcontinent (JMM). The extended JMM was marginal to East Greenland but detached in the Early Eocene (between 52 and 47 Mya); by the Oligocene (27 Mya), all parts of the JMM permanently became part of the Eurasian plate following a westward ridge jump in the direction of the Iceland plume. |
format |
Article in Journal/Newspaper |
author |
Torsvik, Trond H. Amundsen, Hans E F Trønnes, Reidar G. Doubrovine, Pavel V. Gaina, Carmen Kusznir, Nick J. Steinberger, Bernhard Corfu, Fernando Ashwal, Lewis D. Griffin, William L. Werner, Stephanie C. Jamtveit, Bjørn |
spellingShingle |
Torsvik, Trond H. Amundsen, Hans E F Trønnes, Reidar G. Doubrovine, Pavel V. Gaina, Carmen Kusznir, Nick J. Steinberger, Bernhard Corfu, Fernando Ashwal, Lewis D. Griffin, William L. Werner, Stephanie C. Jamtveit, Bjørn Continental crust beneath southeast Iceland |
author_facet |
Torsvik, Trond H. Amundsen, Hans E F Trønnes, Reidar G. Doubrovine, Pavel V. Gaina, Carmen Kusznir, Nick J. Steinberger, Bernhard Corfu, Fernando Ashwal, Lewis D. Griffin, William L. Werner, Stephanie C. Jamtveit, Bjørn |
author_sort |
Torsvik, Trond H. |
title |
Continental crust beneath southeast Iceland |
title_short |
Continental crust beneath southeast Iceland |
title_full |
Continental crust beneath southeast Iceland |
title_fullStr |
Continental crust beneath southeast Iceland |
title_full_unstemmed |
Continental crust beneath southeast Iceland |
title_sort |
continental crust beneath southeast iceland |
publishDate |
2015 |
url |
https://researchers.mq.edu.au/en/publications/fbdc6642-3267-42c5-997f-e053805792fc https://doi.org/10.1073/pnas.1423099112 http://www.scopus.com/inward/record.url?scp=84928154834&partnerID=8YFLogxK |
geographic |
Greenland Jan Mayen |
geographic_facet |
Greenland Jan Mayen |
genre |
East Greenland Greenland Iceland Jan Mayen Northeast Atlantic |
genre_facet |
East Greenland Greenland Iceland Jan Mayen Northeast Atlantic |
op_source |
Torsvik , T H , Amundsen , H E F , Trønnes , R G , Doubrovine , P V , Gaina , C , Kusznir , N J , Steinberger , B , Corfu , F , Ashwal , L D , Griffin , W L , Werner , S C & Jamtveit , B 2015 , ' Continental crust beneath southeast Iceland ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 112 , no. 15 , pp. E1818-E1827 . https://doi.org/10.1073/pnas.1423099112 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1073/pnas.1423099112 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
112 |
container_issue |
15 |
_version_ |
1802006438187368448 |