The vendian passive continental margin in the southern Siberian Craton : Geochemical and isotopic (Sr, Sm-Nd) evidence and U-Pb dating of detrital zircons by the LA-ICP-MS method

E. F. LETNIKOVA*, A. B. KUZNETSOV, I. A. VISHNEVSKAYA, S. V. VESHCHEVA, A. I. PROSHENKIN, H. GENG

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)

16 Citations (Scopus)

Abstract

Geochemical and isotopic (Sm-Nd and Sr) studies of deposits of the Baikal and Oselok Groups in the southern Siberian Craton and LA-ICP-MS U-Pb dating of detrital zircons show that they accumulated in passive continental-margin settings in the Vendian. The time limits of sedimentation were assessed on the basis of Sr chemostratigraphy of carbonate deposits of the Baikal Group and LA-ICP-MS U-Pb dating of detrital zircons in first-cycle terrigenous deposits of the Oselok Group. The main provenances for rocks of these groups were constant. These were rocks of the cover and basement of the Siberian Craton. Tuffite horizons in upper portions of the groups are the only sign of Late Vendian activation of this block, which is reflected in changes of geochemical indices of terrigenous rocks and their younger Sm-Nd model ages.

Original languageEnglish
Pages (from-to)1177-1194
Number of pages18
JournalRussian Geology and Geophysics
Volume54
Issue number10
Early online date26 Sep 2013
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

Keywords

  • Detrital zircons
  • Geochemistry
  • Isotope composition
  • Sedimentary sequences
  • Siberian Craton
  • Vendian-Cambrian

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