Petrogenesis of the despen volcanic rocks of the middle–late ordovician volcanoplutonic association of the tannu-ola terrane (Southwestern Tuva)

E. V. Vetrov, A. N. Uvarov, N. I. Vetrova, F. A. Letnikov, I. A. Vishnevskaya, F. I. Zhimulev, E. S. Andreeva, M. V. Chervyakovskaya

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied the structure and composition of a volcanic unit in the valley of the Despen River, on the southern slope of the East Tannu-Ola Ridge. The unit was earlier assigned to the Lower Devonian Kendei Formation. The new geological and geochronologi-cal data show that it resulted from explosive volcanism at 460–450 Ma. The Despen volcanic rocks formed in association with granitoids of the Argolik complex at the end of the accretion–collision stage of evolution of the Altai–Sayan region, in particular, the Tannu-Ola terrane. These are predominantly felsic ferroan metaluminous and weakly peraluminous nappe volcanic rocks resulted from the differentiation of tholeiitic basalts. Their REE patterns, like those of the Argolik granitoids, are flat in the HREE, show a distinct Eu anomaly, and suggest magma generation at shallow depths in the upper crust. The magmatic source was of subduction origin, as evidenced by the negative Ta–Nb anomalies in the multielement patterns and by εNd(T) = +3.1 to +5.6, and has a Neoproterozoic model age, TNd(DM-2st) = 0.94–0.69 Ga.

Translated title of the contributionПетрогенезис деспенских вулканогенных образований образований средне- позднеордовикской вулкано-плутонической ассоциации ТАННУОЛЬСКОГО террейна (Юго-запад Тувы)
Original languageEnglish
Pages (from-to)633-647
Number of pages15
JournalRussian Geology and Geophysics
Volume62
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Ordovician
  • Petrogeochemical and isotope-geochemical (Sm–Nd) studies
  • Republic of Tuva
  • Volcanism
  • Zircon U–Pb (SHRIMP-II) dating

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES
  • 1.05.KY GEOLOGY

State classification of scientific and technological information

  • 38 GEOLOGY

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