1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province
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 si...
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fttomskstateuniv:vtls:000707449 2023-05-15T15:39:04+02:00 1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province NE Fennoscandia: Multidisciplinary approach and paleotectonic applications Samsonov Alexander V. Stepanova Alexandra V. Salnikova Ekaterina B. Larionova Yulia O. Travin Alexey V. Arzamastsev Andrey A. Egorova Svetlana V. Erofeeva Kseniya G. Stifeeva Maria V. Veselovskiy Roman V. Shcherbakova Valentina V. Shcherbakov Valeriy P. Zhidkov Grigoriy V. Zakharov Vladimir S. 2019 https://doi.org/10.1016/j.precamres.2019.01.017 http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000707449 eng eng vtls:000707449 Precambrian research. 2019. Vol. 324. P. 126-145 Фенноскандинавский щит ключевой палеомагнитный полюс геохронология геохимия палеонапряженность статьи в журналах info:eu-repo/semantics/article 2019 fttomskstateuniv https://doi.org/10.1016/j.precamres.2019.01.017 2020-03-24T15:46:27Z 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) × 1022 Am2 that supports the Proterozoic dipole low hypothesis (Biggin et al. 2009). Article in Journal/Newspaper Barents Sea Fennoscandia kola peninsula Tomsk State University Research Library Barents Sea Kola Peninsula Murmansk Precambrian Research 324 126 145 |
institution |
Open Polar |
collection |
Tomsk State University Research Library |
op_collection_id |
fttomskstateuniv |
language |
English |
topic |
Фенноскандинавский щит ключевой палеомагнитный полюс геохронология геохимия палеонапряженность |
spellingShingle |
Фенноскандинавский щит ключевой палеомагнитный полюс геохронология геохимия палеонапряженность Samsonov Alexander V. Stepanova Alexandra V. Salnikova Ekaterina B. Larionova Yulia O. Travin Alexey V. Arzamastsev Andrey A. Egorova Svetlana V. Erofeeva Kseniya G. Stifeeva Maria V. Veselovskiy Roman V. Shcherbakova Valentina V. Shcherbakov Valeriy P. Zhidkov Grigoriy V. Zakharov Vladimir S. 1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province |
topic_facet |
Фенноскандинавский щит ключевой палеомагнитный полюс геохронология геохимия палеонапряженность |
description |
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) × 1022 Am2 that supports the Proterozoic dipole low hypothesis (Biggin et al. 2009). |
format |
Article in Journal/Newspaper |
author |
Samsonov Alexander V. Stepanova Alexandra V. Salnikova Ekaterina B. Larionova Yulia O. Travin Alexey V. Arzamastsev Andrey A. Egorova Svetlana V. Erofeeva Kseniya G. Stifeeva Maria V. Veselovskiy Roman V. Shcherbakova Valentina V. Shcherbakov Valeriy P. Zhidkov Grigoriy V. Zakharov Vladimir S. |
author_facet |
Samsonov Alexander V. Stepanova Alexandra V. Salnikova Ekaterina B. Larionova Yulia O. Travin Alexey V. Arzamastsev Andrey A. Egorova Svetlana V. Erofeeva Kseniya G. Stifeeva Maria V. Veselovskiy Roman V. Shcherbakova Valentina V. Shcherbakov Valeriy P. Zhidkov Grigoriy V. Zakharov Vladimir S. |
author_sort |
Samsonov |
title |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province |
title_short |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province |
title_full |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province |
title_fullStr |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province |
title_full_unstemmed |
1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions - Eastern Murman Sill Province |
title_sort |
1.86 ga key paleomagnetic pole from the murmansk craton intrusions - eastern murman sill province |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.precamres.2019.01.017 http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000707449 |
geographic |
Barents Sea Kola Peninsula Murmansk |
geographic_facet |
Barents Sea Kola Peninsula Murmansk |
genre |
Barents Sea Fennoscandia kola peninsula |
genre_facet |
Barents Sea Fennoscandia kola peninsula |
op_source |
Precambrian research. 2019. Vol. 324. P. 126-145 |
op_relation |
vtls:000707449 |
op_doi |
https://doi.org/10.1016/j.precamres.2019.01.017 |
container_title |
Precambrian Research |
container_volume |
324 |
container_start_page |
126 |
op_container_end_page |
145 |
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1766370509784612864 |