Early Jurassic Magmatism of the Kobyumé Graben System (Verkhoyansk Framing of the Siberian Craton) and Its Geodynamic Nature
- Autores: Kiselev A.1, Yarmolyuk V.2
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Afiliações:
- Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
- Edição: Volume 484, Nº 2 (2019)
- Páginas: 124-128
- Seção: Geology
- URL: https://journals.rcsi.science/1028-334X/article/view/194582
- DOI: https://doi.org/10.1134/S1028334X19020120
- ID: 194582
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Resumo
Data on the Early Jurassic volcanic rocks of the Kobyumé graben system, which formed at the Verkhoyansk passive margin of the Siberian Craton, are presented. The volcanic complex contains products of basaltic eruptions that occurred under conditions of a shallow sea. The basalts have elevated TiO2 contents (>1.8 wt%), and variations of their composition were controlled by fractionation processes. By their geochemical characteristics, the volcanic rocks are transitional between ocean island basalts and enriched basalts of mid-oceanic ridges. Taking into account the remote location of the Kobyumé graben region from the convergent boundaries of lithospheric plates and from the nearest areas of contemporaneous magmatism, the data obtained support the conclusion that the Kobyumé tectono-magmatic areal is a result of a small mantle plume effect onto the passive margin of the Siberian continent.
Sobre autores
A. Kiselev
Institute of the Earth’s Crust, Siberian Branch,Russian Academy of Sciences
Autor responsável pela correspondência
Email: akiselev@crust.irk.ru
Rússia, Irkutsk, 664033
V. Yarmolyuk
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
Email: akiselev@crust.irk.ru
Rússia, Moscow, 119017