Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland
A palaeomagnetic study comprising the directional results from 289 individual lava flows, sampled along eight sections in the Palaeocene basalts of West Greenland, is reported. The eight individual sections are correlated using lithostratigraphical marker horizons to form a single composite profile....
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1999
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fthighwire:oai:open-archive.highwire.org:gji:137/3/774 2023-05-15T16:27:11+02:00 Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland Riisager, Peter Abrahamsen, Niels 1999-06-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/137/3/774 https://doi.org/10.1046/j.1365-246x.1999.00830.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/137/3/774 http://dx.doi.org/10.1046/j.1365-246x.1999.00830.x Copyright (C) 1999, Oxford University Press Articles TEXT 1999 fthighwire https://doi.org/10.1046/j.1365-246x.1999.00830.x 2015-02-28T21:03:11Z A palaeomagnetic study comprising the directional results from 289 individual lava flows, sampled along eight sections in the Palaeocene basalts of West Greenland, is reported. The eight individual sections are correlated using lithostratigraphical marker horizons to form a single composite profile. Generally, the lithological correlation is in good agreement with the record of geomagnetic secular variation. The total composite palaeomagnetic profile represents a stratigraphic thickness of 1.6 km through the Vaigat Formation, which is the lowermost of the two volcanic formations formed during the main stage of plateau volcanism. Only two polarity zones are found in the composite profile, suggesting a very short duration for the West Greenland main plateau-building volcanism. 40Ar/39Ar dates support a high extrusion rate and also indicate that the lower normal polarity zone is Chron C27n and that the upper reverse polarity zone is Chron C26r. The C27n–C26r transition is fully recorded along one of the sections (Nuusap Qaqqarsua), with intermediate directions covering a 200 m thick succession of lavas. A combined palaeomagnetic, field and geochemical study along this profile showed good agreement; that is, geochemically and geologically derived single magmatic events show groupings of the palaeomagnetic directions. Supposing a duration for the geomagnetic transition of 5000 years, the eruption frequency during this period was as high as one flow every 80 years. Text Greenland HighWire Press (Stanford University) Greenland Vaigat ENVELOPE(-52.947,-52.947,70.200,70.200) Geophysical Journal International 137 3 774 782 |
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HighWire Press (Stanford University) |
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English |
topic |
Articles |
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Articles Riisager, Peter Abrahamsen, Niels Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland |
topic_facet |
Articles |
description |
A palaeomagnetic study comprising the directional results from 289 individual lava flows, sampled along eight sections in the Palaeocene basalts of West Greenland, is reported. The eight individual sections are correlated using lithostratigraphical marker horizons to form a single composite profile. Generally, the lithological correlation is in good agreement with the record of geomagnetic secular variation. The total composite palaeomagnetic profile represents a stratigraphic thickness of 1.6 km through the Vaigat Formation, which is the lowermost of the two volcanic formations formed during the main stage of plateau volcanism. Only two polarity zones are found in the composite profile, suggesting a very short duration for the West Greenland main plateau-building volcanism. 40Ar/39Ar dates support a high extrusion rate and also indicate that the lower normal polarity zone is Chron C27n and that the upper reverse polarity zone is Chron C26r. The C27n–C26r transition is fully recorded along one of the sections (Nuusap Qaqqarsua), with intermediate directions covering a 200 m thick succession of lavas. A combined palaeomagnetic, field and geochemical study along this profile showed good agreement; that is, geochemically and geologically derived single magmatic events show groupings of the palaeomagnetic directions. Supposing a duration for the geomagnetic transition of 5000 years, the eruption frequency during this period was as high as one flow every 80 years. |
format |
Text |
author |
Riisager, Peter Abrahamsen, Niels |
author_facet |
Riisager, Peter Abrahamsen, Niels |
author_sort |
Riisager, Peter |
title |
Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland |
title_short |
Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland |
title_full |
Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland |
title_fullStr |
Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland |
title_full_unstemmed |
Magnetostratigraphy of Palaeocene basalts from the Vaigat Formation of West Greenland |
title_sort |
magnetostratigraphy of palaeocene basalts from the vaigat formation of west greenland |
publisher |
Oxford University Press |
publishDate |
1999 |
url |
http://gji.oxfordjournals.org/cgi/content/short/137/3/774 https://doi.org/10.1046/j.1365-246x.1999.00830.x |
long_lat |
ENVELOPE(-52.947,-52.947,70.200,70.200) |
geographic |
Greenland Vaigat |
geographic_facet |
Greenland Vaigat |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/137/3/774 http://dx.doi.org/10.1046/j.1365-246x.1999.00830.x |
op_rights |
Copyright (C) 1999, Oxford University Press |
op_doi |
https://doi.org/10.1046/j.1365-246x.1999.00830.x |
container_title |
Geophysical Journal International |
container_volume |
137 |
container_issue |
3 |
container_start_page |
774 |
op_container_end_page |
782 |
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1766016267630673920 |