Условия формирования, U/Pb и 40Ar/39Ar изотопное датирование UHT гранулитов мыса Калтыгей, Западное Прибайкалье

Translated title of the contribution: P–T conditions, U/Pb and 40Ar/39Ar isotopic ages of UHT granulites from Cape Kaltygei, Western Baikal Region

N. I. Volkova, E. I. Mikheev, A. V. Travin, A. G. Vladimirov, A. S. Mekhonoshin, V. V. Khlestov

Research output: Contribution to journalArticlepeer-review

Abstract

The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz). The pseudosection-based thermobarometry yields peak metamorphic temperature and pressure values (T=950 °C, P=~9 kbar) and suggests near-isobaric cooling (IBC) conditions during the retrograde evolution of the granulites. The U/Pb zircon age estimates for metamorphism (~1.87 Ga) support the data published by other researchers. The SHRIMP-II U-Pb dating of zircon cores yields a minimum protolith age of 1.94–1.91 Ga. Biotites and amphiboles from granulites of Cape Kaltygei show the 40Ar/39Ar isotopic ages that are close to the Early Paleozoic accretion-collision system of the Western Baikal region.

Translated title of the contributionP–T conditions, U/Pb and 40Ar/39Ar isotopic ages of UHT granulites from Cape Kaltygei, Western Baikal Region
Original languageRussian
Article number8
Pages (from-to)310-331
Number of pages22
JournalGeodynamics and Tectonophysics
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 2021

Keywords

  • Ar-Ar geochronology
  • Cape Kaltygei
  • P–T pseudosections
  • U-Pb
  • UHT granulites
  • Western Baikal region

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES
  • 1.05.GC GEOCHEMISTRY & GEOPHYSICS

State classification of scientific and technological information

  • 38 GEOLOGY

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