Paleomagnetism and Geochronology of 2.68 Ga Dyke from Murmansk Craton, NE Fennoscandia: New Data for Earth’s Magnetic Field Regime in the Neoarchean

Veselovskiy, R.V.; Samsonov, A.V.; Stepanova, A.V.; Larionova, Y.O.; Arzamastsev, A.A.; Travin, A.V.; Egorova, S.V.; Erofeeva, K.G.; Kosterov, A.A.; Shcherbakova, V.V.; Shcherbakov, V.P.; Zhidkov, G.V.; Zakharov, V.S.

Авторы: Veselovskiy R.V., Samsonov A.V., Stepanova A.V., Larionova Yu O., Arzamastsev A.A., Travin A.V., Egorova S.V., Erofeeva K.G., Kosterov A.A., Shcherbakova V.V., Shcherbakov V.P., Zhidkov G.V., Zakharov V.S.
Журнал: Izvestiya. Physics of the Solid Earth
Том: 60
Номер: 4
Год издания: 2024
Издательство: Pleiades Publishing, Inc.
Местоположение издательства: New York, USA
Первая страница: 772
Последняя страница: 794
DOI: 10.1134/S1069351324700538
Аннотация: We present new results of geochronological, rock magnetic, paleomagnetic and paleointensitystudies of the olivine gabbro dyke located at the northern part of the Murmansk craton, NE Fennoscandia(the Kola Peninsula). According to its geochemistry, petrographic and geochronology features, the dykebelongs to the 2.68 Ga dyke swarm, as confirmed by Sm-Nd mineral isochron. We find a significant differencein the rock magnetic and paleomagnetic characteristics of the central and marginal parts of the dyke,which is independently supported by petrography and geochemistry. It is shown that the rocks of the centralpart of the dyke retained not only their primary mineral composition, but also the primary component of thenatural remanent magnetization. We use its direction to determine the 2.68 Ga virtual geomagnetic pole forthe Murmansk craton: Slat = 68.64292° N, Slong = 37.7945° E, N = 41 specimens, Plat = –73.5°, Plong =138.9°, dp/dm = 3.2°/3.4°, paleolat = –65.9°. We also obtain reliable estimates (17 samples) of the Earth’smagnetic field intensity at ca. 2.68 Ga: VDM value is found to be 1.85 × 1022 A m2 corresponding to the geomagneticfield several times weaker than the present-day field.
Добавил в систему: Веселовский Роман Витальевич

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Paleomagnetism and Geochronology of 2.68 Ga Dyke from Murmansk Craton, NE Fennoscandia: New Data for Earth’s Magnetic Field Regime in the Neoarcheanстатья

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