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1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications

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dc.contributor.author Veselovskiy R.
dc.contributor.author Samsonov A.
dc.contributor.author Stepanova A.
dc.contributor.author Salnikova E.
dc.contributor.author Larionova Y.
dc.contributor.author Travin A.
dc.contributor.author Arzamastsev A.
dc.contributor.author Egorova S.
dc.contributor.author Erofeeva K.
dc.contributor.author Stifeeva M.
dc.contributor.author Shcherbakova V.
dc.contributor.author Shcherbakov V.
dc.contributor.author Zhidkov G.
dc.contributor.author Zakharov V.
dc.date.accessioned 2020-01-21T20:37:43Z
dc.date.available 2020-01-21T20:37:43Z
dc.date.issued 2019
dc.identifier.issn 0301-9268
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/157509
dc.description.abstract © 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).
dc.relation.ispartofseries Precambrian Research
dc.subject Fennoscandian Shield
dc.subject Geochemistry
dc.subject Geochronology
dc.subject Key paleomagnetic pole
dc.subject Murmansk craton
dc.subject Paleointensity
dc.title 1.86 Ga key paleomagnetic pole from the Murmansk craton intrusions – Eastern Murman Sill Province, NE Fennoscandia: Multidisciplinary approach and paleotectonic applications
dc.type Article
dc.relation.ispartofseries-volume 324
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 126
dc.source.id SCOPUS03019268-2019-324-SID85061095678


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