Инд. авторы:	Prokopiev A.V., Polyansky O.P., Koroleva O.V., Vasiliev D.A., Tomshin M.D., Reverdatto V.V., Novikova S.A.
Заглавие:	The Mid-Paleozoic and Mid-Triassic Pulses of Trap Magmatism in the East of the Siberian Platform: Evidence from the First Ar-40/Ar-39 Isotope Dating of Dolerite Sills
Библ. ссылка:	Prokopiev A.V., Polyansky O.P., Koroleva O.V., Vasiliev D.A., Tomshin M.D., Reverdatto V.V., Novikova S.A. The Mid-Paleozoic and Mid-Triassic Pulses of Trap Magmatism in the East of the Siberian Platform: Evidence from the First Ar-40/Ar-39 Isotope Dating of Dolerite Sills // Doklady Earth Sciences. - 2020. - Vol.490. - Iss. 1. - P.4-7. - ISSN 1028-334X. - EISSN 1531-8354.
Идентиф-ры:	DOI: 10.1134/S1028334X20010092; WoS: 000528631600002;
Реферат:	eng: The paper presents the results from the first Ar-40/Ar-39 isotope dating of eleven mafic sills recovered by deep boreholes in the eastern Siberian Platform. Most of the dates are assigned to the Devonian magmatic stage (357-379 Ma). The two previously established pulses of dike magmatism in the Yakutsk-Vilyui large igneous province also fall within this range. The ages of 397.6 +/- 4.3 and 406.2 +/- 5.6 Ma obtained in this study imply one more pulse of magmatism at the Emsian-Eifelian boundary. The chemical composition of the dolerites corresponds to that of the derivatives of garnet peridotite. Estimates of the depth of the melting center suggest its location both inside the mantle lithosphere and at the lithosphere-asthenosphere boundary. The Mid-Triassic age (232.6 +/- 7.4 Ma) of the sill recovered by the Morkoka borehole implies the manifestation here of the second pulse of trap magmatism related to the Siberian plume.
Ключевые слова:	Siberian Platform; MANTLE; sill; dolerites; Yakutsk-Vilyui large igneous province;
Издано:	2020
Физ. хар-ка:	с.4-7