New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia
SUMMARY The Svecofennian gabbro intrusions coincide temporally with the global 2100–1800 Ma orogens related to the amalgamation of the Mesoproterozoic supercontinent Nuna. We provide a new reliable 1891–1875 Ma palaeomagnetic pole for Fennoscandia based on rock magnetic and palaeomagnetic studies on...
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2023
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croxfordunivpr:10.1093/gji/ggad247 2024-01-21T10:06:06+01:00 New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia Luoto, T Salminen, J Mertanen, S Elming, S-Å Pesonen, L J University of Helsinki 2023 http://dx.doi.org/10.1093/gji/ggad247 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggad247/50713885/ggad247.pdf https://academic.oup.com/gji/article-pdf/235/2/1810/51387446/ggad247.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Geophysical Journal International volume 235, issue 2, page 1810-1831 ISSN 0956-540X 1365-246X Geochemistry and Petrology Geophysics journal-article 2023 croxfordunivpr https://doi.org/10.1093/gji/ggad247 2023-12-22T09:40:44Z SUMMARY The Svecofennian gabbro intrusions coincide temporally with the global 2100–1800 Ma orogens related to the amalgamation of the Mesoproterozoic supercontinent Nuna. We provide a new reliable 1891–1875 Ma palaeomagnetic pole for Fennoscandia based on rock magnetic and palaeomagnetic studies on the Svecofennian intrusions in central Finland to fill gaps in the Palaeoproterozoic palaeomagnetic record. By using the new pole together with other global high-quality data, we propose a new palaeogeographic reconstruction at 1885 Ma. This, together with previous data, supports a long-lived relatively stable position of Fennoscandia at low to moderate latitudes at 1890–1790 Ma. Similar stable pole positions have also been obtained for Kalahari at 1880–1830 Ma, Siberia at 1880–1850 Ma, and possibly India at 1980–1775 Ma. A new reconstruction at the beginning of this period indicates the convergence of several cratons at 1885 Ma in the initial stages of the amalgamation of the Nuna supercontinent at low to moderate latitudes. The close proximity of cratons at low to moderate latitudes is further supported by global and regional palaeoclimatic indicators. Stable position of several cratons could indicate a global period of minimal apparent drift at ca. 1880–1830 Ma. Before this period, the global palaeomagnetic record indicates large back-and-forth swings, most prominently seen in the high-resolution 2020–1870 Ma Coronation loops of the Slave craton. These large back-and-forth movements have been explained as resulting from an unstable geomagnetic field or basin- or local-scale vertical-axis rotations. However, the most likely explanation is inertial interchange true polar wander (IITPW) events, which is in line with the suggestion of large amplitude true polar wander events during the formation of the supercontinent. Article in Journal/Newspaper Fennoscandia Northern Finland Siberia Oxford University Press (via Crossref) Geophysical Journal International |
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Open Polar |
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Oxford University Press (via Crossref) |
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croxfordunivpr |
language |
English |
topic |
Geochemistry and Petrology Geophysics |
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Geochemistry and Petrology Geophysics Luoto, T Salminen, J Mertanen, S Elming, S-Å Pesonen, L J New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia |
topic_facet |
Geochemistry and Petrology Geophysics |
description |
SUMMARY The Svecofennian gabbro intrusions coincide temporally with the global 2100–1800 Ma orogens related to the amalgamation of the Mesoproterozoic supercontinent Nuna. We provide a new reliable 1891–1875 Ma palaeomagnetic pole for Fennoscandia based on rock magnetic and palaeomagnetic studies on the Svecofennian intrusions in central Finland to fill gaps in the Palaeoproterozoic palaeomagnetic record. By using the new pole together with other global high-quality data, we propose a new palaeogeographic reconstruction at 1885 Ma. This, together with previous data, supports a long-lived relatively stable position of Fennoscandia at low to moderate latitudes at 1890–1790 Ma. Similar stable pole positions have also been obtained for Kalahari at 1880–1830 Ma, Siberia at 1880–1850 Ma, and possibly India at 1980–1775 Ma. A new reconstruction at the beginning of this period indicates the convergence of several cratons at 1885 Ma in the initial stages of the amalgamation of the Nuna supercontinent at low to moderate latitudes. The close proximity of cratons at low to moderate latitudes is further supported by global and regional palaeoclimatic indicators. Stable position of several cratons could indicate a global period of minimal apparent drift at ca. 1880–1830 Ma. Before this period, the global palaeomagnetic record indicates large back-and-forth swings, most prominently seen in the high-resolution 2020–1870 Ma Coronation loops of the Slave craton. These large back-and-forth movements have been explained as resulting from an unstable geomagnetic field or basin- or local-scale vertical-axis rotations. However, the most likely explanation is inertial interchange true polar wander (IITPW) events, which is in line with the suggestion of large amplitude true polar wander events during the formation of the supercontinent. |
author2 |
University of Helsinki |
format |
Article in Journal/Newspaper |
author |
Luoto, T Salminen, J Mertanen, S Elming, S-Å Pesonen, L J |
author_facet |
Luoto, T Salminen, J Mertanen, S Elming, S-Å Pesonen, L J |
author_sort |
Luoto, T |
title |
New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia |
title_short |
New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia |
title_full |
New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia |
title_fullStr |
New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia |
title_full_unstemmed |
New palaeoproterozoic palaeomagnetic data from Central and Northern Finland indicate a long-lived stable position for Fennoscandia |
title_sort |
new palaeoproterozoic palaeomagnetic data from central and northern finland indicate a long-lived stable position for fennoscandia |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/gji/ggad247 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggad247/50713885/ggad247.pdf https://academic.oup.com/gji/article-pdf/235/2/1810/51387446/ggad247.pdf |
genre |
Fennoscandia Northern Finland Siberia |
genre_facet |
Fennoscandia Northern Finland Siberia |
op_source |
Geophysical Journal International volume 235, issue 2, page 1810-1831 ISSN 0956-540X 1365-246X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/gji/ggad247 |
container_title |
Geophysical Journal International |
_version_ |
1788696555440570368 |