Birkhin Volcanoplutonic Association, Ol’khon Region, Western Baikal Area: Petrological Criteria of Comagmatic Origin

A. V. Lavrenchuk, E. V. Sklyarov, A. E. Izokh, A. B. Kotov, E. A. Vasyukova, V. S. Fedorovskii, D. P. Gladkochub, T. V. Donskaya, A. M. Mazukabzov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Abstract: This paper reports the results of thermodynamic modeling of the formation of the Birkhin volcanoplutonic association by means of geochemical thermometry. The obtained liquid line of descent for the magma chamber of the Birkhin Massif indicates that the melt evolved into the field of subalkaline composition. The melts of the volcanics of the Tsagan-Zaba complex are identical to the melts in the magma chamber in both major components and REEs. It was concluded that the Birkhin and Tsagan-Zaba complexes are comagmatic. A scenario was proposed for the development of the Birkhin volcanoplutonic association involving multiple eruptions of volcanic rocks during its formation. It was shown that the intermediate rocks are not derivatives of basic magmas, but were produced by interaction of basic volcanic rocks with felsic intrusions cutting them.

Original languageEnglish
Pages (from-to)291-306
Number of pages16
JournalPetrology
Volume27
Issue number3
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • basic magmatism
  • geochemical thermometry
  • thermodynamic modeling
  • Western Baikal area
  • CRYSTALLIZATION
  • PETROGENESIS
  • TERRANE
  • ROCKS
  • COMPLEXES
  • GEOCHEMISTRY

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