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.
Highlights
The Ediacaran is one of the key evolution stages for fold belts surrounding the Siberian Craton from the north, west, and south
The area adjacent to the western border of the Yenisei Ridge serves as the basement for the Fore-Yenisei sedimentary basin [7], which is essential for understanding the relationships between the platform cover and the folded margin of the Siberian paleocontinent in this time interval
This paper presents new data for the early Ediacaran stage of magmatism in the evolution of the western margin of the Siberian Craton on the example of a dike complex on the Yenisei Ridge
Summary
The Ediacaran is one of the key evolution stages for fold belts surrounding the Siberian Craton from the north, west, and south. It is in this period that strong tectonic transformations caused by accretionary-collisional events manifested on the Taimyr Peninsula, in the Eastern Sayan and the Transbaikalia Region [1,2,3,4,5]. As became clear in recent years, the Ediacaran stage was one of the main periods in the tectonic evolution of the Yenisei Ridge—A key structure in the western margin of the Siberian Craton [6], whose accretionary-collisional structure still needs to be further investigated. The area adjacent to the western border of the Yenisei Ridge serves as the basement for the Fore-Yenisei sedimentary basin [7], which is essential for understanding the relationships between the platform cover and the folded margin of the Siberian paleocontinent in this time interval.
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