Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology
New palaeomagnetic data from the autochthonous Early Cambrian Dividal Group (northern Scandinavia) confirm earlier findings, and a refined palaeomagnetic pole of 58.4degreesN and 122.5degreesE, places Baltica at intermediate southerly latitudes at similar to535 Ma. Palaeomagnetic data from the immed...
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ftulundlup:oai:lup.lub.lu.se:3125eb33-0883-4d7c-a41d-1fbcc6d64135 2023-05-15T16:01:07+02:00 Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology Rehnström, Emma Torsvik, TH 2003 https://lup.lub.lu.se/record/297269 eng eng Taylor & Francis https://lup.lub.lu.se/record/297269 wos:000186251500002 scopus:2942588741 GFF; 125(3), pp 131-138 (2003) ISSN: 2000-0863 Geology Baltica apparent polar wander path geochronology Proterozoic granites Cambrian sediments palaeomagnetism palaeogeography contributiontojournal/article info:eu-repo/semantics/article text 2003 ftulundlup 2023-02-01T23:28:32Z New palaeomagnetic data from the autochthonous Early Cambrian Dividal Group (northern Scandinavia) confirm earlier findings, and a refined palaeomagnetic pole of 58.4degreesN and 122.5degreesE, places Baltica at intermediate southerly latitudes at similar to535 Ma. Palaeomagnetic data from the immediately underlying granitic basement (pole: 9.8degreesN, 226.7degreesE) differ markedly from the Dividal sediments. The result of this fieldtest increases the palaeomagnetic reliability of the Dividal Group results. We dated the granitic basement in the eastern part of the Tornetrask area (corresponding to our palaeomagnetic site) to 1786+/-4 Ma (U-Pb zircon and titanite), whilst deformed allochthonous granites west of lake Tornetrask are slightly older (1800+/-4 Ma; U-Pb zircon). These ages are compatible with autochthonous basement ages to the east of the study area, but also with ages from basement windows to the west. Preliminary palaeomagnetic data from the 1786+/-4 Ma granitic basement are clearly pre-Phanerozoic in origin, and comparable and concordant zircon and titanite ages may hint that the magnetisation could be primary. However, the palaeomagnetic pole does not match contemporaneous poles from Baltica, which suggest a tectonic explanation (no palaeohorizontal control), a problem of secular variation (only one site) or a younger but pre-Phanerozoic remagnetisation event, which did not affect the U-Pb system in zircon and titanite. Article in Journal/Newspaper Dividalen Lund University Publications (LUP) Dividalen ENVELOPE(19.547,19.547,68.881,68.881) |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Baltica apparent polar wander path geochronology Proterozoic granites Cambrian sediments palaeomagnetism palaeogeography |
spellingShingle |
Geology Baltica apparent polar wander path geochronology Proterozoic granites Cambrian sediments palaeomagnetism palaeogeography Rehnström, Emma Torsvik, TH Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology |
topic_facet |
Geology Baltica apparent polar wander path geochronology Proterozoic granites Cambrian sediments palaeomagnetism palaeogeography |
description |
New palaeomagnetic data from the autochthonous Early Cambrian Dividal Group (northern Scandinavia) confirm earlier findings, and a refined palaeomagnetic pole of 58.4degreesN and 122.5degreesE, places Baltica at intermediate southerly latitudes at similar to535 Ma. Palaeomagnetic data from the immediately underlying granitic basement (pole: 9.8degreesN, 226.7degreesE) differ markedly from the Dividal sediments. The result of this fieldtest increases the palaeomagnetic reliability of the Dividal Group results. We dated the granitic basement in the eastern part of the Tornetrask area (corresponding to our palaeomagnetic site) to 1786+/-4 Ma (U-Pb zircon and titanite), whilst deformed allochthonous granites west of lake Tornetrask are slightly older (1800+/-4 Ma; U-Pb zircon). These ages are compatible with autochthonous basement ages to the east of the study area, but also with ages from basement windows to the west. Preliminary palaeomagnetic data from the 1786+/-4 Ma granitic basement are clearly pre-Phanerozoic in origin, and comparable and concordant zircon and titanite ages may hint that the magnetisation could be primary. However, the palaeomagnetic pole does not match contemporaneous poles from Baltica, which suggest a tectonic explanation (no palaeohorizontal control), a problem of secular variation (only one site) or a younger but pre-Phanerozoic remagnetisation event, which did not affect the U-Pb system in zircon and titanite. |
format |
Article in Journal/Newspaper |
author |
Rehnström, Emma Torsvik, TH |
author_facet |
Rehnström, Emma Torsvik, TH |
author_sort |
Rehnström, Emma |
title |
Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology |
title_short |
Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology |
title_full |
Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology |
title_fullStr |
Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology |
title_full_unstemmed |
Cambrian sediments and Proterozoic granites in the Dividalen-Tometrdsk area, northern Scandinavia: Palaeomagnetism and U-Pb geochronology |
title_sort |
cambrian sediments and proterozoic granites in the dividalen-tometrdsk area, northern scandinavia: palaeomagnetism and u-pb geochronology |
publisher |
Taylor & Francis |
publishDate |
2003 |
url |
https://lup.lub.lu.se/record/297269 |
long_lat |
ENVELOPE(19.547,19.547,68.881,68.881) |
geographic |
Dividalen |
geographic_facet |
Dividalen |
genre |
Dividalen |
genre_facet |
Dividalen |
op_source |
GFF; 125(3), pp 131-138 (2003) ISSN: 2000-0863 |
op_relation |
https://lup.lub.lu.se/record/297269 wos:000186251500002 scopus:2942588741 |
_version_ |
1766397111161585664 |