An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting
Dykes of the East Greenland Tertiary dyke swarm can be divided into pre- and syn-break-up tholeiitic dykes, and post-break-up transitional dykes. Of the pre- and syn-break-up dykes, the most abundant group (Tholeiitic Series; TS) has major element compositions similar to the main part of the East Gr...
Published in: | Journal of Petrology |
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Language: | English |
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Online Access: | https://forskning.ruc.dk/da/publications/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 https://doi.org/10.1093/petrology/egg071 https://hdl.handle.net/1800/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 |
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fturoskildefispu:oai:pure.atira.dk:publications/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 2023-05-15T16:03:18+02:00 An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting Hanghøj, Karen Storey, Michael Stecher, Ole 2003 https://forskning.ruc.dk/da/publications/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 https://doi.org/10.1093/petrology/egg071 https://hdl.handle.net/1800/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 eng eng info:eu-repo/semantics/restrictedAccess Hanghøj , K , Storey , M & Stecher , O 2003 , ' An isotope trace element study of the East Greenland Tertiary dyke swarm : Constraints on temporal and spatial evolution during continental rifting ' , Journal of Petrology , vol. 44 , no. 11 , pp. 2081-2012 . https://doi.org/10.1093/petrology/egg071 isotopes trace elements mantle sources mantle melting article 2003 fturoskildefispu https://doi.org/10.1093/petrology/egg071 2022-12-11T06:55:35Z Dykes of the East Greenland Tertiary dyke swarm can be divided into pre- and syn-break-up tholeiitic dykes, and post-break-up transitional dykes. Of the pre- and syn-break-up dykes, the most abundant group (Tholeiitic Series; TS) has major element compositions similar to the main part of the East Greenland flood basalts. A group of high-MgO tholeiitic dykes (Picrite–Ankaramite Series; PAS) are much less common, and are equivalent to some of the oldest lavas of the East Greenland flood basalts. Isotopic compositions of the TS and PAS dykes partly overlap with those for Iceland, but Pb isotopic compositions extend to less radiogenic values than those seen in either Iceland or North Atlantic mid-ocean ridge basalt (MORB). The isotopically depleted source required to account for this isotopic variation is interpreted as subcontinental lithospheric mantle with low 87Sr/86Sr and 206Pb/204Pb and high εNd. The post-break-up Transitional Series (TRANS) dykes are isotopically distinct from Iceland and MORB, and are interpreted as the products of contamination of Iceland plume melts with continental crust. Comparison of the Nd–Sr–Pb isotopic and trace element compositions of dykes from different segments of the East Greenland margin indicates that there is no systematic compositional change with distance from the presumed proto-Icelandic plume centre. This suggests that a northward-increasing crustal thickness observed offshore may be attributed to active upwelling rather than a systematic rise in temperature towards the plume centre. Dykes of the East Greenland Tertiary dyke swarm can be divided into pre- and syn-break-up tholeiitic dykes, and post-break-up transitional dykes. Of the pre- and syn-break-up dykes, the most abundant group (Tholeiitic Series; TS) has major element compositions similar to the main part of the East Greenland flood basalts. A group of high-MgO tholeiitic dykes (Picrite–Ankaramite Series; PAS) are much less common, and are equivalent to some of the oldest lavas of the East Greenland flood ... Article in Journal/Newspaper East Greenland Greenland Iceland North Atlantic Roskilde University Research Portal (RUC) Greenland Journal of Petrology 44 11 2081 2112 |
institution |
Open Polar |
collection |
Roskilde University Research Portal (RUC) |
op_collection_id |
fturoskildefispu |
language |
English |
topic |
isotopes trace elements mantle sources mantle melting |
spellingShingle |
isotopes trace elements mantle sources mantle melting Hanghøj, Karen Storey, Michael Stecher, Ole An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting |
topic_facet |
isotopes trace elements mantle sources mantle melting |
description |
Dykes of the East Greenland Tertiary dyke swarm can be divided into pre- and syn-break-up tholeiitic dykes, and post-break-up transitional dykes. Of the pre- and syn-break-up dykes, the most abundant group (Tholeiitic Series; TS) has major element compositions similar to the main part of the East Greenland flood basalts. A group of high-MgO tholeiitic dykes (Picrite–Ankaramite Series; PAS) are much less common, and are equivalent to some of the oldest lavas of the East Greenland flood basalts. Isotopic compositions of the TS and PAS dykes partly overlap with those for Iceland, but Pb isotopic compositions extend to less radiogenic values than those seen in either Iceland or North Atlantic mid-ocean ridge basalt (MORB). The isotopically depleted source required to account for this isotopic variation is interpreted as subcontinental lithospheric mantle with low 87Sr/86Sr and 206Pb/204Pb and high εNd. The post-break-up Transitional Series (TRANS) dykes are isotopically distinct from Iceland and MORB, and are interpreted as the products of contamination of Iceland plume melts with continental crust. Comparison of the Nd–Sr–Pb isotopic and trace element compositions of dykes from different segments of the East Greenland margin indicates that there is no systematic compositional change with distance from the presumed proto-Icelandic plume centre. This suggests that a northward-increasing crustal thickness observed offshore may be attributed to active upwelling rather than a systematic rise in temperature towards the plume centre. Dykes of the East Greenland Tertiary dyke swarm can be divided into pre- and syn-break-up tholeiitic dykes, and post-break-up transitional dykes. Of the pre- and syn-break-up dykes, the most abundant group (Tholeiitic Series; TS) has major element compositions similar to the main part of the East Greenland flood basalts. A group of high-MgO tholeiitic dykes (Picrite–Ankaramite Series; PAS) are much less common, and are equivalent to some of the oldest lavas of the East Greenland flood ... |
format |
Article in Journal/Newspaper |
author |
Hanghøj, Karen Storey, Michael Stecher, Ole |
author_facet |
Hanghøj, Karen Storey, Michael Stecher, Ole |
author_sort |
Hanghøj, Karen |
title |
An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting |
title_short |
An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting |
title_full |
An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting |
title_fullStr |
An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting |
title_full_unstemmed |
An isotope trace element study of the East Greenland Tertiary dyke swarm:Constraints on temporal and spatial evolution during continental rifting |
title_sort |
isotope trace element study of the east greenland tertiary dyke swarm:constraints on temporal and spatial evolution during continental rifting |
publishDate |
2003 |
url |
https://forskning.ruc.dk/da/publications/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 https://doi.org/10.1093/petrology/egg071 https://hdl.handle.net/1800/c710e0c8-b81b-47aa-b3d3-a3d6fececce1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Iceland North Atlantic |
genre_facet |
East Greenland Greenland Iceland North Atlantic |
op_source |
Hanghøj , K , Storey , M & Stecher , O 2003 , ' An isotope trace element study of the East Greenland Tertiary dyke swarm : Constraints on temporal and spatial evolution during continental rifting ' , Journal of Petrology , vol. 44 , no. 11 , pp. 2081-2012 . https://doi.org/10.1093/petrology/egg071 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1093/petrology/egg071 |
container_title |
Journal of Petrology |
container_volume |
44 |
container_issue |
11 |
container_start_page |
2081 |
op_container_end_page |
2112 |
_version_ |
1766398932282245120 |