Doklady Earth Sciences

, Volume 473, Issue 1, pp 323–328 | Cite as

Polychronous zirconology of syenites from the Avashla intrusion in the Kurgass anticline (Southern Urals)

  • A. A. Krasnobaev
  • V. N. Puchkov
  • N. D. Sergeeva
  • S. P. Shokalski
  • S. V. Busharina
Geochemistry
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Abstract

Zircons were separated from syenites of the Avashla intrusion in the Kurgass anticline of the Bashkir megaanticlinorium in the Southern Urals. The obtained samples were dated using the U–Pb procedure by means of a SHRIMP II ion microprobe. The integrated mineralogical, geochemical, and isotope studies of zircons resulted in primary data on the origin and current conditions of zircons in syenites of the Avashla intrusion. The relics of early zircon generations (1320–1340 Ma) allowed us to specify the geological position of syenites along with the stratigraphic location of the enclosing sedimentary rocks. The time of the transformation (metamorphism) of the zircons at the Middle–Upper Riphean boundary is represented by a dating of 1097±20 Ma, which is of importance for specifying the boundary age and for revealing a geological event that started a new development stage of the stratoregion in the Upper Riphean.

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • A. A. Krasnobaev
    • 1
    • 2
  • V. N. Puchkov
    • 1
    • 2
  • N. D. Sergeeva
    • 2
  • S. P. Shokalski
    • 3
  • S. V. Busharina
    • 1
  1. 1.Institute of Geology and Geochemistry, Ural BranchRussian Academy of SciencesYekaterinburgRussia
  2. 2.Institute of Geology, Ufa Scientific CenterRussian Academy of SciencesUfaRussia
  3. 3.Karpinsky Russian Geological Research InstituteSt. PetersburgRussia

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