Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga
Baltica and Laurentia form the core of the hypothesized Mesoproterozoic supercontinent Nuna in most paleogeographical reconstructions. Long gaps still exist in the Mesoproterozoic paleomagnetic record of Baltica, and different relative configurations for Baltica and Laurentia have been presented. Th...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/337068 2024-01-07T09:43:12+01:00 Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga Luoto, Toni Salminen, Johanna Obst, Karsten Department of Geosciences and Geography 2021-12-03T08:06:01Z 22 application/pdf http://hdl.handle.net/10138/337068 eng eng Elsevier Scientific Publ. Co 10.1016/j.precamres.2021.106444 Luoto , T , Salminen , J & Obst , K 2021 , ' Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga ' , Precambrian Research , vol. 367 , 106444 . https://doi.org/10.1016/j.precamres.2021.106444 ORCID: /0000-0001-5347-1920/work/104209864 5dde1044-b30c-49eb-8c48-b575ba11315e http://hdl.handle.net/10138/337068 000724739400003 cc_by openAccess info:eu-repo/semantics/openAccess 1171 Geosciences 114 Physical sciences Paleomagnetism Mafic dykes Baltica Nuna Precambrian Proterozoic U-PB GEOCHRONOLOGY SORGENFREI-TORNQUIST ZONE EAST EUROPEAN CRATON DANISH ISLAND POLAR WANDER MESOPROTEROZOIC SUPERCONTINENT BADDELEYITE GEOCHRONOLOGY FENNOSCANDIAN SHIELD MAGNETIC-ANISOTROPY TECTONIC EVOLUTION Article publishedVersion 2021 ftunivhelsihelda 2023-12-14T00:08:43Z Baltica and Laurentia form the core of the hypothesized Mesoproterozoic supercontinent Nuna in most paleogeographical reconstructions. Long gaps still exist in the Mesoproterozoic paleomagnetic record of Baltica, and different relative configurations for Baltica and Laurentia have been presented. This study presents new paleomagnetic data obtained for mafic dykes on Bornholm (Denmark, southwest Baltica). We provide a new 1.326 +/- 0.010 Ga Bornholm Group I paleomagnetic key pole (Plat: 06 degrees N, Plon: 165 degrees E, K: 21, A95: 6 degrees) for Baltica. This pole supports the low-latitude equatorial core of Nuna at 1.33 Ga, where Kola Peninsula and Northern Norway of Baltica were facing northeastern Greenland of Laurentia. Based on statistically different magnetization directions with Group I and differences in Nb-Zr-Y systematics, we propose a separate Bornholm Group II paleomagnetic pole. This undated, poor-quality pole indicates a paleolatitude of ca. 50 degrees, possibly reflecting an age difference compared to Group I, accompanied with the continental drift. On Bornholm, the wide Listed and Kas dykes of uncertain age yield significantly different paleomagnetic results compared to the other studied dykes there. In addition, the virtual geomagnetic poles (VGPs) of these dykes are 45 degrees apart from each other. On the basis of similar Nb-Zr-Y systematics with the dykes of the 0.98-0.94 Ga Blekinge Dalarna Dolerite Group (Sweden) and overlapping paleomagnetic data with the high-quality 0.95-0.94 Ga paleomagnetic poles of Baltica, an early Neoproterozoic age for the magnetization is proposed. The relatively big discrepancy between Listed and Kas VGPs could stem from an unaveraged paleosecular variation or from a small but significant age difference during rapid plate movements. Peer reviewed Article in Journal/Newspaper Fennoscandian Greenland kola peninsula Northern Norway HELDA – University of Helsinki Open Repository Danish Island ENVELOPE(-83.599,-83.599,65.884,65.884) Greenland Kola Peninsula Norway Precambrian Research 367 106444 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
1171 Geosciences 114 Physical sciences Paleomagnetism Mafic dykes Baltica Nuna Precambrian Proterozoic U-PB GEOCHRONOLOGY SORGENFREI-TORNQUIST ZONE EAST EUROPEAN CRATON DANISH ISLAND POLAR WANDER MESOPROTEROZOIC SUPERCONTINENT BADDELEYITE GEOCHRONOLOGY FENNOSCANDIAN SHIELD MAGNETIC-ANISOTROPY TECTONIC EVOLUTION |
spellingShingle |
1171 Geosciences 114 Physical sciences Paleomagnetism Mafic dykes Baltica Nuna Precambrian Proterozoic U-PB GEOCHRONOLOGY SORGENFREI-TORNQUIST ZONE EAST EUROPEAN CRATON DANISH ISLAND POLAR WANDER MESOPROTEROZOIC SUPERCONTINENT BADDELEYITE GEOCHRONOLOGY FENNOSCANDIAN SHIELD MAGNETIC-ANISOTROPY TECTONIC EVOLUTION Luoto, Toni Salminen, Johanna Obst, Karsten Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga |
topic_facet |
1171 Geosciences 114 Physical sciences Paleomagnetism Mafic dykes Baltica Nuna Precambrian Proterozoic U-PB GEOCHRONOLOGY SORGENFREI-TORNQUIST ZONE EAST EUROPEAN CRATON DANISH ISLAND POLAR WANDER MESOPROTEROZOIC SUPERCONTINENT BADDELEYITE GEOCHRONOLOGY FENNOSCANDIAN SHIELD MAGNETIC-ANISOTROPY TECTONIC EVOLUTION |
description |
Baltica and Laurentia form the core of the hypothesized Mesoproterozoic supercontinent Nuna in most paleogeographical reconstructions. Long gaps still exist in the Mesoproterozoic paleomagnetic record of Baltica, and different relative configurations for Baltica and Laurentia have been presented. This study presents new paleomagnetic data obtained for mafic dykes on Bornholm (Denmark, southwest Baltica). We provide a new 1.326 +/- 0.010 Ga Bornholm Group I paleomagnetic key pole (Plat: 06 degrees N, Plon: 165 degrees E, K: 21, A95: 6 degrees) for Baltica. This pole supports the low-latitude equatorial core of Nuna at 1.33 Ga, where Kola Peninsula and Northern Norway of Baltica were facing northeastern Greenland of Laurentia. Based on statistically different magnetization directions with Group I and differences in Nb-Zr-Y systematics, we propose a separate Bornholm Group II paleomagnetic pole. This undated, poor-quality pole indicates a paleolatitude of ca. 50 degrees, possibly reflecting an age difference compared to Group I, accompanied with the continental drift. On Bornholm, the wide Listed and Kas dykes of uncertain age yield significantly different paleomagnetic results compared to the other studied dykes there. In addition, the virtual geomagnetic poles (VGPs) of these dykes are 45 degrees apart from each other. On the basis of similar Nb-Zr-Y systematics with the dykes of the 0.98-0.94 Ga Blekinge Dalarna Dolerite Group (Sweden) and overlapping paleomagnetic data with the high-quality 0.95-0.94 Ga paleomagnetic poles of Baltica, an early Neoproterozoic age for the magnetization is proposed. The relatively big discrepancy between Listed and Kas VGPs could stem from an unaveraged paleosecular variation or from a small but significant age difference during rapid plate movements. Peer reviewed |
author2 |
Department of Geosciences and Geography |
format |
Article in Journal/Newspaper |
author |
Luoto, Toni Salminen, Johanna Obst, Karsten |
author_facet |
Luoto, Toni Salminen, Johanna Obst, Karsten |
author_sort |
Luoto, Toni |
title |
Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga |
title_short |
Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga |
title_full |
Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga |
title_fullStr |
Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga |
title_full_unstemmed |
Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga |
title_sort |
revisiting mafic dykes of bornholm : implications for baltica in supercontinent nuna at 1.3 ga |
publisher |
Elsevier Scientific Publ. Co |
publishDate |
2021 |
url |
http://hdl.handle.net/10138/337068 |
long_lat |
ENVELOPE(-83.599,-83.599,65.884,65.884) |
geographic |
Danish Island Greenland Kola Peninsula Norway |
geographic_facet |
Danish Island Greenland Kola Peninsula Norway |
genre |
Fennoscandian Greenland kola peninsula Northern Norway |
genre_facet |
Fennoscandian Greenland kola peninsula Northern Norway |
op_relation |
10.1016/j.precamres.2021.106444 Luoto , T , Salminen , J & Obst , K 2021 , ' Revisiting mafic dykes of Bornholm : Implications for Baltica in supercontinent Nuna at 1.3 Ga ' , Precambrian Research , vol. 367 , 106444 . https://doi.org/10.1016/j.precamres.2021.106444 ORCID: /0000-0001-5347-1920/work/104209864 5dde1044-b30c-49eb-8c48-b575ba11315e http://hdl.handle.net/10138/337068 000724739400003 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Precambrian Research |
container_volume |
367 |
container_start_page |
106444 |
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1787424464299884544 |