Early ediacaran magmatism in the yenisei ridge and evolution of the southwestern margin of the siberian craton

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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.

Original languageEnglish
Article number565
Pages (from-to)1-23
Number of pages23
JournalMinerals
Volume10
Issue number6
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • Continental margin
  • Dikes
  • Ediacaran
  • Magmatism
  • Siberian Craton
  • U-Pb and Ar-Ar geochronology
  • Yenisei Ridge

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