Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex
Continental breakup between northwest Europe and Greenland (approximately 56 Ma) was associated with widespread magmatism. Silica undersaturated alkaline porphyritic igneous rocks of a similar age have previously been dredged near the mid-Norwegian coast. These igneous rocks of the Vestbrona Formati...
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Society of Exploration Geophysicists og American Association of Petroleum Geologists
2017
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Online Access: | http://hdl.handle.net/10852/61061 http://urn.nb.no/URN:NBN:no-63692 https://doi.org/10.1190/int-2016-0143.1 |
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ftoslouniv:oai:www.duo.uio.no:10852/61061 2023-05-15T16:30:00+02:00 Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex Hafeez, Amer Planke, Sverre Jerram, Dougal Alexander Millett, John M Maharjan, Dwarika Prestvik, Tore 2017-08-09T09:36:12Z http://hdl.handle.net/10852/61061 http://urn.nb.no/URN:NBN:no-63692 https://doi.org/10.1190/int-2016-0143.1 EN eng Society of Exploration Geophysicists og American Association of Petroleum Geologists NFR/223272 http://urn.nb.no/URN:NBN:no-63692 Hafeez, Amer Planke, Sverre Jerram, Dougal Alexander Millett, John M Maharjan, Dwarika Prestvik, Tore . Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex. Interpretation. 2017, 5(3), SK103-SK120 http://hdl.handle.net/10852/61061 1485061 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Interpretation&rft.volume=5&rft.spage=SK103&rft.date=2017 Interpretation 5 3 SK103 SK120 http://dx.doi.org/10.1190/int-2016-0143.1 URN:NBN:no-63692 Fulltext https://www.duo.uio.no/bitstream/handle/10852/61061/4/int-2016-0143.1.pdf 2324-8858 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2017 ftoslouniv https://doi.org/10.1190/int-2016-0143.1 2020-06-21T08:51:38Z Continental breakup between northwest Europe and Greenland (approximately 56 Ma) was associated with widespread magmatism. Silica undersaturated alkaline porphyritic igneous rocks of a similar age have previously been dredged near the mid-Norwegian coast. These igneous rocks of the Vestbrona Formation have previously been interpreted as either igneous plugs or volcanic flows. New 3D seismic data indicate that relatively small sill complexes are abundant in the same region. In total, 36 sills with a size of 0.1‒9 km2 have been mapped. In addition, 10 seismic horizons were interpreted and tied to nearby wells to obtain a robust stratigraphic framework. The sills mainly intrude Cretaceous and Paleocene sequences; however, one sill is also identified in the pre-Cretaceous sequences. The sills locally form erosional remnants on the seabed due to massive uplifting and erosion of the continental margin. Vintage igneous and sedimentary dredge samples have been reanalyzed, including petrography, geochemistry (X-ray fluorescence [XRF], X-ray diffraction [XRD]), biostratigraphy, and Ar-Ar geochronology. The new Ar-Ar data suggest that the sills are 1–2 Ma older than breakup (approximately 57–58 Ma). Furthermore, the biostratigraphy and petrography of two sediment samples suggest that the samples were collected from near in situ subcrops and not of an ice rafted origin. The sediment samples are of Danian age and are strongly metamorphosed, most likely by contact metamorphism resulting from heating during sill emplacement. The newly identified sills have implications for the petroleum prospectivity of the study area including source rock maturation within thermal aureoles and the long-term alteration of fluid migration pathways. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ Article in Journal/Newspaper Greenland Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Greenland Norway Interpretation 5 3 SK103 SK120 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Continental breakup between northwest Europe and Greenland (approximately 56 Ma) was associated with widespread magmatism. Silica undersaturated alkaline porphyritic igneous rocks of a similar age have previously been dredged near the mid-Norwegian coast. These igneous rocks of the Vestbrona Formation have previously been interpreted as either igneous plugs or volcanic flows. New 3D seismic data indicate that relatively small sill complexes are abundant in the same region. In total, 36 sills with a size of 0.1‒9 km2 have been mapped. In addition, 10 seismic horizons were interpreted and tied to nearby wells to obtain a robust stratigraphic framework. The sills mainly intrude Cretaceous and Paleocene sequences; however, one sill is also identified in the pre-Cretaceous sequences. The sills locally form erosional remnants on the seabed due to massive uplifting and erosion of the continental margin. Vintage igneous and sedimentary dredge samples have been reanalyzed, including petrography, geochemistry (X-ray fluorescence [XRF], X-ray diffraction [XRD]), biostratigraphy, and Ar-Ar geochronology. The new Ar-Ar data suggest that the sills are 1–2 Ma older than breakup (approximately 57–58 Ma). Furthermore, the biostratigraphy and petrography of two sediment samples suggest that the samples were collected from near in situ subcrops and not of an ice rafted origin. The sediment samples are of Danian age and are strongly metamorphosed, most likely by contact metamorphism resulting from heating during sill emplacement. The newly identified sills have implications for the petroleum prospectivity of the study area including source rock maturation within thermal aureoles and the long-term alteration of fluid migration pathways. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ |
format |
Article in Journal/Newspaper |
author |
Hafeez, Amer Planke, Sverre Jerram, Dougal Alexander Millett, John M Maharjan, Dwarika Prestvik, Tore |
spellingShingle |
Hafeez, Amer Planke, Sverre Jerram, Dougal Alexander Millett, John M Maharjan, Dwarika Prestvik, Tore Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex |
author_facet |
Hafeez, Amer Planke, Sverre Jerram, Dougal Alexander Millett, John M Maharjan, Dwarika Prestvik, Tore |
author_sort |
Hafeez, Amer |
title |
Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex |
title_short |
Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex |
title_full |
Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex |
title_fullStr |
Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex |
title_full_unstemmed |
Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex |
title_sort |
upper paleocene ultramafic igneous rocks offshore mid-norway: re-interpretation of the vestbrona formation as a sill complex |
publisher |
Society of Exploration Geophysicists og American Association of Petroleum Geologists |
publishDate |
2017 |
url |
http://hdl.handle.net/10852/61061 http://urn.nb.no/URN:NBN:no-63692 https://doi.org/10.1190/int-2016-0143.1 |
geographic |
Greenland Norway |
geographic_facet |
Greenland Norway |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
2324-8858 |
op_relation |
NFR/223272 http://urn.nb.no/URN:NBN:no-63692 Hafeez, Amer Planke, Sverre Jerram, Dougal Alexander Millett, John M Maharjan, Dwarika Prestvik, Tore . Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex. Interpretation. 2017, 5(3), SK103-SK120 http://hdl.handle.net/10852/61061 1485061 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Interpretation&rft.volume=5&rft.spage=SK103&rft.date=2017 Interpretation 5 3 SK103 SK120 http://dx.doi.org/10.1190/int-2016-0143.1 URN:NBN:no-63692 Fulltext https://www.duo.uio.no/bitstream/handle/10852/61061/4/int-2016-0143.1.pdf |
op_doi |
https://doi.org/10.1190/int-2016-0143.1 |
container_title |
Interpretation |
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5 |
container_issue |
3 |
container_start_page |
SK103 |
op_container_end_page |
SK120 |
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1766019721530966016 |