Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance
Abstract Mafic dykes from the Øksfjord-Langfjord area were intruded at different stages during the prolonged tectonomagmatic evolution of the Seiland Igneous Province. Field relations, petrography and geochemistry indicate the presence of four dyke generations with alkali basalt composition and one...
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s0016756800018902 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800018902 |
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crcambridgeupr:10.1017/s0016756800018902 2024-03-03T08:47:23+00:00 Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance Reginiussen, H. Ravna, E. J. Krogh Berglund, K. 1995 http://dx.doi.org/10.1017/s0016756800018902 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800018902 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 132, issue 6, page 667-681 ISSN 0016-7568 1469-5081 Geology journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0016756800018902 2024-02-08T08:31:37Z Abstract Mafic dykes from the Øksfjord-Langfjord area were intruded at different stages during the prolonged tectonomagmatic evolution of the Seiland Igneous Province. Field relations, petrography and geochemistry indicate the presence of four dyke generations with alkali basalt composition and one generation of alkaline lamprophyres. The entire dyke suite has geochemical signatures consistent with formation in a within-plate geotectonic environment. Trace elements indicate that the alkali basalt dykes have OIB (ocean island basalt) affinities and we suggest a sublithospheric mantle source. The data support a rift-related origin for the Seiland Igneous Province. Longevity of magmatism in the Seiland Igneous Province (300 m.y.) is difficult to explain within a conventional mantle plume framework. Instead, it is proposed that the intermittent magmatism in the province was predominantly permissive and controlled by lithosphere structure. Article in Journal/Newspaper Northern Norway Øksfjord Ocean Island Cambridge University Press Norway Seiland ENVELOPE(23.275,23.275,70.430,70.430) Øksfjord ENVELOPE(22.351,22.351,70.239,70.239) Langfjord ENVELOPE(22.363,22.363,70.056,70.056) Geological Magazine 132 6 667 681 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology |
spellingShingle |
Geology Reginiussen, H. Ravna, E. J. Krogh Berglund, K. Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance |
topic_facet |
Geology |
description |
Abstract Mafic dykes from the Øksfjord-Langfjord area were intruded at different stages during the prolonged tectonomagmatic evolution of the Seiland Igneous Province. Field relations, petrography and geochemistry indicate the presence of four dyke generations with alkali basalt composition and one generation of alkaline lamprophyres. The entire dyke suite has geochemical signatures consistent with formation in a within-plate geotectonic environment. Trace elements indicate that the alkali basalt dykes have OIB (ocean island basalt) affinities and we suggest a sublithospheric mantle source. The data support a rift-related origin for the Seiland Igneous Province. Longevity of magmatism in the Seiland Igneous Province (300 m.y.) is difficult to explain within a conventional mantle plume framework. Instead, it is proposed that the intermittent magmatism in the province was predominantly permissive and controlled by lithosphere structure. |
format |
Article in Journal/Newspaper |
author |
Reginiussen, H. Ravna, E. J. Krogh Berglund, K. |
author_facet |
Reginiussen, H. Ravna, E. J. Krogh Berglund, K. |
author_sort |
Reginiussen, H. |
title |
Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance |
title_short |
Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance |
title_full |
Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance |
title_fullStr |
Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance |
title_full_unstemmed |
Mafic dykes from Øksfjord, Seiland Igneous Province, northern Norway: geochemistry and palaeotectonic significance |
title_sort |
mafic dykes from øksfjord, seiland igneous province, northern norway: geochemistry and palaeotectonic significance |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0016756800018902 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800018902 |
long_lat |
ENVELOPE(23.275,23.275,70.430,70.430) ENVELOPE(22.351,22.351,70.239,70.239) ENVELOPE(22.363,22.363,70.056,70.056) |
geographic |
Norway Seiland Øksfjord Langfjord |
geographic_facet |
Norway Seiland Øksfjord Langfjord |
genre |
Northern Norway Øksfjord Ocean Island |
genre_facet |
Northern Norway Øksfjord Ocean Island |
op_source |
Geological Magazine volume 132, issue 6, page 667-681 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756800018902 |
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Geological Magazine |
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132 |
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6 |
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667 |
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