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Early Ediacaran Magmatism in the Yenisei Ridge and Evolution of the Southwestern Margin of the Siberian Craton

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Open access
Authors
Vernikovskaya, A.
Vernikovsky, V.A.
Matushkin, N.
Kadilnikov, P.
Metelkin, D.V.
Romanova, I.
Li, Zheng-Xiang
Bogdanov, E.
Date
2020
Type
Journal Article

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Vernikovskaya, A. and Vernikovsky, V.A. and Matushkin, N. and Kadilnikov, P. and Metelkin, D.V. and Romanova, I. and Li, Z.X. et al. 2020. Early Ediacaran Magmatism in the Yenisei Ridge and Evolution of the Southwestern Margin of the Siberian Craton. Minerals. 10 (6): 565.
Source Title
Minerals
DOI
Faculty
Faculty of Science and Engineering
School
School of Earth and Planetary Sciences (EPS)
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Abstract

We present the first comprehensive data for the early Ediacaran stage of evolution of the western active continental margin of the Siberian Craton (Yenisei Ridge). U-Pb (SHRIMP-II SIMS) data for zircons from dikes of picrodolerites, quartz diorites, and leucocratic granites show that they were emplaced at 625 ± 5, 623 ± 8, and 626 ± 5 Ma, respectively, which indicates a narrow time window of Ediacaran magmatic events. The mafic tholeiitic rocks have OIB and E-MORB mantle components in their magmatic sources. Mineralogical and geochemical observations showed that the mantle-sourced mafic melts assimilated some crustal material, forming Th-enriched dikes of intermediate composition and K-and Rb-enriched felsic rocks. The possible geodynamic conditions for the formation of these early Ediacaran dikes are shown and a geodynamic model is presented for the development of the Yenisei Ridge orogen from the late Cryogenian to the late Ediacaran.

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