Two episodes of metamorphism in the rocks of the eastern Kitoi block (Sharyzhalgai uplift of the Siberian platform) according to the Garnet amphibolite data

V. P. Sukhorukov, V. B. Savel'eva

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1 Citation (Scopus)

Abstract

The Archean metamorphism in the southwestern Siberian craton was confirmed by the studies of the Kitoy and Irkutsk blocks. However, the parameters of the metamorphism process are still poorly investigated. The article presents the first results of studying the metamorphism conditions of garnet amphibolites sampled from the Kitoy sillimanite deposit. The reaction relationships of the studied minerals give grounds to distinguish two episodes of the regional metamorphism. At the end of the first episode, (Т=710-770 °С and Р=8.3-8.8 kb), the pressure reduced to 1.3-2.5 kbar at T=700 °C at the retrograde stage, and amphibole-plagioclase rims formed around garnet grains. During the second episode of metamorphism, the temperature reached 890 °С (granulite facies), and Cpx+Opx paragenesis replaced hornblende. The second episode of metamorphism is not evident in all the samples (considering the same bulk rocks composition of the rocks), which suggests its local character.

Translated title of the contributionДве стадии метаморфизма в породах восточной части Китойского блока (Шарыжалгайский выступ Сибирской платформы) по данным изучения гранатовых амфиболитов
Original languageEnglish
Pages (from-to)107-121
Number of pages15
JournalGeodynamics and Tectonophysics
Volume11
Issue number1
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • Siberian craton
  • Kitoy block
  • Archean
  • granulite metamorphism
  • amphibolite
  • PT-parameters
  • P-T path of metamorphism
  • SILLIMANITE SCHIST DEPOSIT
  • IRKUT BLOCK
  • RICH GRANULITES
  • CRATON
  • TEMPERATURE
  • AGE
  • EVOLUTION
  • COMPLEX
  • CALIBRATION
  • THERMOBAROMETRY

State classification of scientific and technological information

  • 38 GEOLOGY

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