Age, Hf-isotope systematic of detrital zircons and the sources of conglomerates of the Southern Demerdzhi Mountain, Mounatinous Crimea

S. V. Rud'ko, N. B. Kuznetsov*, E. A. Belousova, T. V. Romanyuk

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The U–Pb dating and Hf isotope systematics of detrital zircons from a sandstone interbed in the section of the upper conglomerate sequence of the Mt. Southern Demerdzhi were carried out. The dominant populations of detrital zircons in the studied sample characterize episodes of magmatic activity within the source of the Upper Jurassic conglomerates. Magmatism was manifested in the Vendian-Cambrian, Carbon-Triassic, and Late Jurassic. The εHf values of detrital zircons of these ages indicate the insignificant role of the ancient (Archean–Early Proterozoic) continental crust in the protolith of magmatic chambers. The similarity of the detrital zircons age distribution from the Middle Jurassic and Upper Jurassic conglomerate strata suggests that they are molasses of the Cimmerian orogen. The absence of products of Middle Jurassic magmatism in molasses of the Cimmerian orogen, which we fixed, limits position of the Cimmerian orogen in the southern part of the Scythian plate. It is shown that the primary source of the Precambrian detrital zircons were mobilized within the Cimmerian orogen the crustal fragments of the Peri-Gondwanan origin, rather than the basement complexes of the East European Platform, similar to the complexes of the Ukrainian shield. The reconstruction of the main stages of the accumulation of the coarse-grained strata of the Mountaineous Crimea in the context of the tectonic evolution of the southern margin of Laurasia during the Mesozoic is presented.

Original languageEnglish
Pages (from-to)569-587
Number of pages19
JournalGeotectonics
Volume53
Issue number5
DOIs
Publication statusPublished - Sep 2019

Keywords

  • Mountainous Crimea
  • Cimmerian orogen
  • Cimmerian folding
  • detrital zircons
  • U-Pb dating
  • Hf isotope systematics
  • source of conglomerates
  • Gondwana
  • Baltica

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