1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications
© 2019 Elsevier B.V. We present the first 1.86 Ga paleomagnetic key pole of Fennoscandia obtained for the dolerite sills of the Murmansk craton – Eastern Murman Sill Province, that outcrop in the northern part of the Kola Peninsula along the Barents Sea coast for a distance of 200 km (Slat = 68.5°;...
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ftneicon:oai:rour.neicon.ru:rour/198978 2023-05-15T15:39:07+02:00 1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications Veselovskiy R. Samsonov A. Stepanova A. Salnikova E. Larionova Y. Travin A. Arzamastsev A. Egorova S. Erofeeva K. Stifeeva M. Shcherbakova V. Shcherbakov V. Zhidkov G. Zakharov V. 2019 https://openrepository.ru/article?id=198978 unknown Precambrian Research 324 126 http://rour.neicon.ru:80/xmlui/bitstream/rour/198978/1/nora.pdf 0301-9268 https://openrepository.ru/article?id=198978 SCOPUS03019268-2019-324-SID85061095678 Fennoscandian Shield Geochemistry Geochronology Key paleomagnetic pole Murmansk craton Paleointensity Article 2019 ftneicon 2020-07-21T12:06:06Z © 2019 Elsevier B.V. We present the first 1.86 Ga paleomagnetic key pole of Fennoscandia obtained for the dolerite sills of the Murmansk craton – Eastern Murman Sill Province, that outcrop in the northern part of the Kola Peninsula along the Barents Sea coast for a distance of 200 km (Slat = 68.5°; Slong = 37.9°; N = 16 sites; Plat = 54.7°; Plong = 234.7°; dp/dm = 4.3°/6.3° Qv = 5). The age of the sills and their characteristic remanent magnetization (ChRM) was determined by four independent geochronometers: U-Pb – 1860 ± 4 and 1863 ± 7 Ma (ID-TIMS, baddeleyite), Sm-Nd – 1889 ± 57 Ma, Rb-Sr – 1850 Ma, Ar/Ar – 1865 ± 8 and 1857 ± 20 Ma (biotite). The primary nature of the ChRM is confirmed by the results of petrographic, geochemical, paleo- and rock magnetic studies, as well as by thermochronological data. The similarity of the petrographic and geochemical characteristics of sills from different localities indicates that these dolerite sills were formed during a single magmatic event and their cooling down to 580 °C occurred at depths of about 10 ± 2 km and lasted ∼2800 years or even faster. Paleogeographic reconstruction of Fennoscandia on the basis of the obtained paleomagnetic pole is in general agreement with the previously suggested configuration of core of the Nuna/Columbia supercontinent (Evans and Mitchell, 2011; Meert and Santosh, 2017). A new reliable Thellier-Coe paleointensity determination for this time reveals a rather low mean VDM = 1.8 (±0.1) × 10 22 Am 2 that supports the Proterozoic dipole low hypothesis (Biggin et al., 2009). Article in Journal/Newspaper Barents Sea Fennoscandia Fennoscandian kola peninsula NORA (National aggregator of open repositories of Russian universities) Barents Sea Kola Peninsula Murmansk |
institution |
Open Polar |
collection |
NORA (National aggregator of open repositories of Russian universities) |
op_collection_id |
ftneicon |
language |
unknown |
topic |
Fennoscandian Shield Geochemistry Geochronology Key paleomagnetic pole Murmansk craton Paleointensity |
spellingShingle |
Fennoscandian Shield Geochemistry Geochronology Key paleomagnetic pole Murmansk craton Paleointensity Veselovskiy R. Samsonov A. Stepanova A. Salnikova E. Larionova Y. Travin A. Arzamastsev A. Egorova S. Erofeeva K. Stifeeva M. Shcherbakova V. Shcherbakov V. Zhidkov G. Zakharov V. 1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications |
topic_facet |
Fennoscandian Shield Geochemistry Geochronology Key paleomagnetic pole Murmansk craton Paleointensity |
description |
© 2019 Elsevier B.V. We present the first 1.86 Ga paleomagnetic key pole of Fennoscandia obtained for the dolerite sills of the Murmansk craton – Eastern Murman Sill Province, that outcrop in the northern part of the Kola Peninsula along the Barents Sea coast for a distance of 200 km (Slat = 68.5°; Slong = 37.9°; N = 16 sites; Plat = 54.7°; Plong = 234.7°; dp/dm = 4.3°/6.3° Qv = 5). The age of the sills and their characteristic remanent magnetization (ChRM) was determined by four independent geochronometers: U-Pb – 1860 ± 4 and 1863 ± 7 Ma (ID-TIMS, baddeleyite), Sm-Nd – 1889 ± 57 Ma, Rb-Sr – 1850 Ma, Ar/Ar – 1865 ± 8 and 1857 ± 20 Ma (biotite). The primary nature of the ChRM is confirmed by the results of petrographic, geochemical, paleo- and rock magnetic studies, as well as by thermochronological data. The similarity of the petrographic and geochemical characteristics of sills from different localities indicates that these dolerite sills were formed during a single magmatic event and their cooling down to 580 °C occurred at depths of about 10 ± 2 km and lasted ∼2800 years or even faster. Paleogeographic reconstruction of Fennoscandia on the basis of the obtained paleomagnetic pole is in general agreement with the previously suggested configuration of core of the Nuna/Columbia supercontinent (Evans and Mitchell, 2011; Meert and Santosh, 2017). A new reliable Thellier-Coe paleointensity determination for this time reveals a rather low mean VDM = 1.8 (±0.1) × 10 22 Am 2 that supports the Proterozoic dipole low hypothesis (Biggin et al., 2009). |
format |
Article in Journal/Newspaper |
author |
Veselovskiy R. Samsonov A. Stepanova A. Salnikova E. Larionova Y. Travin A. Arzamastsev A. Egorova S. Erofeeva K. Stifeeva M. Shcherbakova V. Shcherbakov V. Zhidkov G. Zakharov V. |
author_facet |
Veselovskiy R. Samsonov A. Stepanova A. Salnikova E. Larionova Y. Travin A. Arzamastsev A. Egorova S. Erofeeva K. Stifeeva M. Shcherbakova V. Shcherbakov V. Zhidkov G. Zakharov V. |
author_sort |
Veselovskiy R. |
title |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications |
title_short |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications |
title_full |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications |
title_fullStr |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications |
title_full_unstemmed |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications |
title_sort |
1.86 ga key paleomagnetic pole from the murmansk craton intrusions – eastern murman sill province, ne fennoscandia: multidisciplinary approach and paleotectonic applications |
publishDate |
2019 |
url |
https://openrepository.ru/article?id=198978 |
geographic |
Barents Sea Kola Peninsula Murmansk |
geographic_facet |
Barents Sea Kola Peninsula Murmansk |
genre |
Barents Sea Fennoscandia Fennoscandian kola peninsula |
genre_facet |
Barents Sea Fennoscandia Fennoscandian kola peninsula |
op_source |
SCOPUS03019268-2019-324-SID85061095678 |
op_relation |
Precambrian Research 324 126 http://rour.neicon.ru:80/xmlui/bitstream/rour/198978/1/nora.pdf 0301-9268 https://openrepository.ru/article?id=198978 |
_version_ |
1766370568591900672 |