A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica?
The origin of Large Igneous Provinces (LIPs) associated with continental breakup and the reconstruction of continents older than ca. 320 million years (pre-Pangea) are contentious research problems. Here we study the petrology of a 615–590 Ma dolerite dyke complex that intruded rift basins of the ma...
Published in: | Geochemistry, Geophysics, Geosystems |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/da/publications/a-mantle-plume-origin-for-the-scandinavian-dyke-complex(a6276a42-d3b8-4df8-ba65-bb77751930e3).html https://doi.org/10.1029/2018GC007941 https://pure.au.dk/ws/files/194272947/A_Mantle_Plume_Origin_for_the_Scandinavian_Dyke_Complex.pdf http://www.scopus.com/inward/record.url?scp=85063073915&partnerID=8YFLogxK |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/a6276a42-d3b8-4df8-ba65-bb77751930e3 |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/a6276a42-d3b8-4df8-ba65-bb77751930e3 2023-05-15T16:51:34+02:00 A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? Tegner, Christian Andersen, Torgeir B. Kjøll, Hans Jørgen Brown, Eric L. Hagen-Peter, Graham Corfu, Fernando Planke, Sverre Torsvik, Trond H. 2019-02 application/pdf https://pure.au.dk/portal/da/publications/a-mantle-plume-origin-for-the-scandinavian-dyke-complex(a6276a42-d3b8-4df8-ba65-bb77751930e3).html https://doi.org/10.1029/2018GC007941 https://pure.au.dk/ws/files/194272947/A_Mantle_Plume_Origin_for_the_Scandinavian_Dyke_Complex.pdf http://www.scopus.com/inward/record.url?scp=85063073915&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Tegner , C , Andersen , T B , Kjøll , H J , Brown , E L , Hagen-Peter , G , Corfu , F , Planke , S & Torsvik , T H 2019 , ' A Mantle Plume Origin for the Scandinavian Dyke Complex : A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? ' , Geochemistry, Geophysics, Geosystems , vol. 20 , no. 2 , pp. 1075-1094 . https://doi.org/10.1029/2018GC007941 article 2019 ftuniaarhuspubl https://doi.org/10.1029/2018GC007941 2023-03-08T23:56:41Z The origin of Large Igneous Provinces (LIPs) associated with continental breakup and the reconstruction of continents older than ca. 320 million years (pre-Pangea) are contentious research problems. Here we study the petrology of a 615–590 Ma dolerite dyke complex that intruded rift basins of the magma-rich margin of Baltica and now is exposed in the Scandinavian Caledonides. These dykes are part of the Central Iapetus Magmatic Province (CIMP), a LIP emplaced in Baltica and Laurentia during opening of the Caledonian Wilson Cycle. The >1,000-km-long dyke complex displays lateral geochemical zonation from enriched to depleted basaltic compositions from south to north. Geochemical modelling of major and trace elements shows these compositions are best explained by melting hot mantle 75–250 °C above ambient mantle. Although the trace element modelling solutions are nonunique, the best explanation involves melting a laterally zoned mantle plume with enriched and depleted peridotite lithologies, similar to present-day Iceland and to the North Atlantic Igneous Province. The origin of CIMP appears to have involved several mantle plumes. This is best explained if rifting and breakup magmatism coincided with plume generation zones at the margins of a Large Low Shear-wave Velocity Province (LLSVP) at the core mantle boundary. If the LLSVPs are quasi-stationary back in time as suggested in recent geodynamic models, the CIMP provides a guide for reconstructing the paleogeography of Baltica and Laurentia 615 million years ago to the LLSVP now positioned under the Pacific Ocean. Our results provide a stimulus for using LIPs as piercing points for plate reconstructions. Article in Journal/Newspaper Iceland North Atlantic Aarhus University: Research Pacific Geochemistry, Geophysics, Geosystems 20 2 1075 1094 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
The origin of Large Igneous Provinces (LIPs) associated with continental breakup and the reconstruction of continents older than ca. 320 million years (pre-Pangea) are contentious research problems. Here we study the petrology of a 615–590 Ma dolerite dyke complex that intruded rift basins of the magma-rich margin of Baltica and now is exposed in the Scandinavian Caledonides. These dykes are part of the Central Iapetus Magmatic Province (CIMP), a LIP emplaced in Baltica and Laurentia during opening of the Caledonian Wilson Cycle. The >1,000-km-long dyke complex displays lateral geochemical zonation from enriched to depleted basaltic compositions from south to north. Geochemical modelling of major and trace elements shows these compositions are best explained by melting hot mantle 75–250 °C above ambient mantle. Although the trace element modelling solutions are nonunique, the best explanation involves melting a laterally zoned mantle plume with enriched and depleted peridotite lithologies, similar to present-day Iceland and to the North Atlantic Igneous Province. The origin of CIMP appears to have involved several mantle plumes. This is best explained if rifting and breakup magmatism coincided with plume generation zones at the margins of a Large Low Shear-wave Velocity Province (LLSVP) at the core mantle boundary. If the LLSVPs are quasi-stationary back in time as suggested in recent geodynamic models, the CIMP provides a guide for reconstructing the paleogeography of Baltica and Laurentia 615 million years ago to the LLSVP now positioned under the Pacific Ocean. Our results provide a stimulus for using LIPs as piercing points for plate reconstructions. |
format |
Article in Journal/Newspaper |
author |
Tegner, Christian Andersen, Torgeir B. Kjøll, Hans Jørgen Brown, Eric L. Hagen-Peter, Graham Corfu, Fernando Planke, Sverre Torsvik, Trond H. |
spellingShingle |
Tegner, Christian Andersen, Torgeir B. Kjøll, Hans Jørgen Brown, Eric L. Hagen-Peter, Graham Corfu, Fernando Planke, Sverre Torsvik, Trond H. A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? |
author_facet |
Tegner, Christian Andersen, Torgeir B. Kjøll, Hans Jørgen Brown, Eric L. Hagen-Peter, Graham Corfu, Fernando Planke, Sverre Torsvik, Trond H. |
author_sort |
Tegner, Christian |
title |
A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? |
title_short |
A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? |
title_full |
A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? |
title_fullStr |
A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? |
title_full_unstemmed |
A Mantle Plume Origin for the Scandinavian Dyke Complex:A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? |
title_sort |
mantle plume origin for the scandinavian dyke complex:a “piercing point” for 615 ma plate reconstruction of baltica? |
publishDate |
2019 |
url |
https://pure.au.dk/portal/da/publications/a-mantle-plume-origin-for-the-scandinavian-dyke-complex(a6276a42-d3b8-4df8-ba65-bb77751930e3).html https://doi.org/10.1029/2018GC007941 https://pure.au.dk/ws/files/194272947/A_Mantle_Plume_Origin_for_the_Scandinavian_Dyke_Complex.pdf http://www.scopus.com/inward/record.url?scp=85063073915&partnerID=8YFLogxK |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_source |
Tegner , C , Andersen , T B , Kjøll , H J , Brown , E L , Hagen-Peter , G , Corfu , F , Planke , S & Torsvik , T H 2019 , ' A Mantle Plume Origin for the Scandinavian Dyke Complex : A “Piercing Point” for 615 Ma Plate Reconstruction of Baltica? ' , Geochemistry, Geophysics, Geosystems , vol. 20 , no. 2 , pp. 1075-1094 . https://doi.org/10.1029/2018GC007941 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018GC007941 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
20 |
container_issue |
2 |
container_start_page |
1075 |
op_container_end_page |
1094 |
_version_ |
1766041692001009664 |