Доклады Академии наукДоклады Академии наук0869-5652The Russian Academy of Sciences1277710.31857/S0869-56524845584-588Research ArticleEarly Jurassic magmatism of the Kobyuminsky system of grabens (Verkhoyansk frame of the Siberian platform) and its geodynamic natureKiselevA. I.akiselev@crust.irk.ruYarmolyukV. V.<p>Academician of the RAS</p>akiselev@crust.irk.ruInstitute of the Earth`s Crust of the Siberian Branch of the Russian Academy of SciencesInstitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences1605201948455845882105201921052019Copyright © 2019, Russian academy of sciences2019<p>The Kobyuminsky system of grabens was formed in the Early Jurassic within the Verkhoyansk passive margin of the Siberian platform. The volcanic complex of grabens is represented by basalts with elevated TiO<sub>2</sub> contents ( 1.8 wt%). According to geochemical characteristics, the rocks of the volcanic series occupy an intermediate position between the basalts of the oceanic islands (OIB) and the basalt-rich mid-oceanic ridges (E-MORB). The data obtained led to the conclusion that the Kobuminsky system of grabens within the passive margin of the Siberian continent arose in connection with the activity of a small mantle plume.</p>mesozoicVerkhoyansk folded areapassive margin of the Siberian platformmagmatismgrabenmantle plumesмезозойВерхоянская складчатая областьпассивная окраина Сибирской платформымагматизмграбенмантийные плюмы[Тектоника, геодинамика и металлогения территории Республики Саха (Якутия) / Под ред. М.И. Кузьмина, Л.М. Парфенова. М.: МАИК Наука/Интерпериодика, 2001. 627 с.][Layer P.W., Newberry R., Fujita K., Parfenov L.M. // Geology. 2001. V. 29. P. 167–170.][Летникова Е.Ф., Изох А.Э., Николенко Е.И. и др. // ДАН. 2014. Т. 459. № 3. С. 327–331.][Macdonald J.A, Katsura I. // J. Petrol. 1964. V. 5. № 1. P. 82–133.][Rudnick R.L., Fountain D.M. // Rev. Geophys. 1995. V. 33. P. 267—309.][Sun S.S., McDonough D. // Geol. Soc. Spec. Amer. Publ. 1989. № 42. P. 313–345.][Pearce J.A. Continental Basalt and Mantle Xenolith. Nantwich; Shiwa, 1983. P. 230–249.]