Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway
Summary . Quartz-keratophyres from an ensimatic island arc on Bømlo, southwest Norwegian Caledonides, resting on the Lykling ophiolite, have yielded a Rb/Sr whole rock age of 535 ± 46 Ma. This Cambrian age, which is a minimum age of formation for the ophiolite, indicates an early phase of subduction...
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Cambridge University Press (CUP)
1983
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Online Access: | http://dx.doi.org/10.1017/s0016756800027758 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800027758 |
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crcambridgeupr:10.1017/s0016756800027758 2024-03-03T08:47:23+00:00 Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway Furnes, H. Austrheim, H. Amaliksen, K. G. Nordas, J. 1983 http://dx.doi.org/10.1017/s0016756800027758 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800027758 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 120, issue 6, page 607-612 ISSN 0016-7568 1469-5081 Geology journal-article 1983 crcambridgeupr https://doi.org/10.1017/s0016756800027758 2024-02-08T08:44:37Z Summary . Quartz-keratophyres from an ensimatic island arc on Bømlo, southwest Norwegian Caledonides, resting on the Lykling ophiolite, have yielded a Rb/Sr whole rock age of 535 ± 46 Ma. This Cambrian age, which is a minimum age of formation for the ophiolite, indicates an early phase of subduction, corresponding with the orogenic activity known from northern Norway, i.e. the Finnmarkian. Before Middle Ordovician time, the ophiolite and ensimatic arc had been obducted onto continental crust and deformed, as they are unconformably overlain by a volcanic complex of subaerial rhyolites and andesites which have yielded Rb/Sr whole rock ages of 464 ± 16 and 468 ± 23 Ma respectively. Article in Journal/Newspaper Northern Norway Cambridge University Press Norway Geological Magazine 120 6 607 612 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology |
spellingShingle |
Geology Furnes, H. Austrheim, H. Amaliksen, K. G. Nordas, J. Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway |
topic_facet |
Geology |
description |
Summary . Quartz-keratophyres from an ensimatic island arc on Bømlo, southwest Norwegian Caledonides, resting on the Lykling ophiolite, have yielded a Rb/Sr whole rock age of 535 ± 46 Ma. This Cambrian age, which is a minimum age of formation for the ophiolite, indicates an early phase of subduction, corresponding with the orogenic activity known from northern Norway, i.e. the Finnmarkian. Before Middle Ordovician time, the ophiolite and ensimatic arc had been obducted onto continental crust and deformed, as they are unconformably overlain by a volcanic complex of subaerial rhyolites and andesites which have yielded Rb/Sr whole rock ages of 464 ± 16 and 468 ± 23 Ma respectively. |
format |
Article in Journal/Newspaper |
author |
Furnes, H. Austrheim, H. Amaliksen, K. G. Nordas, J. |
author_facet |
Furnes, H. Austrheim, H. Amaliksen, K. G. Nordas, J. |
author_sort |
Furnes, H. |
title |
Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway |
title_short |
Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway |
title_full |
Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway |
title_fullStr |
Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway |
title_full_unstemmed |
Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway |
title_sort |
evidence for an incipient early caledonian (cambrian) orogenic phase in southwestern norway |
publisher |
Cambridge University Press (CUP) |
publishDate |
1983 |
url |
http://dx.doi.org/10.1017/s0016756800027758 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800027758 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Geological Magazine volume 120, issue 6, page 607-612 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756800027758 |
container_title |
Geological Magazine |
container_volume |
120 |
container_issue |
6 |
container_start_page |
607 |
op_container_end_page |
612 |
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1792503561106489344 |