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V. A. Popov
V. A. Popov

Articles

Geology
  • Date submitted
    2022-04-04
  • Date accepted
    2022-05-13
  • Online publication date
    2022-07-04
  • Date published
    2022-07-13

Distribution of trace elements controlled by sector and growth zonings in zircon from a miaskite pegmatite of the Vishnegorsky massif, the Southern Urals

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Data on the content and distribution of trace and rare-earth elements (SIMS method) in sectors and growth zones of a large zircon crystal from miaskite pegmatites of the Vishnegogorsky massif are presented. The morphology of the zircon crystal is a combination of a dipyramid {111} and prism {010}. It has been established that the growth sector of dipyramid {111} is characterized by almost one order of magnitude higher contents of Y, Nb, REE, Th; higher Th/U and Eu/Eu* values; REE distribution spectra are flatter compared to prism {010} growth sector. A regular decrease in the content of trace and rare-earth elements in the direction from the central zone to the marginal zone of crystal growth was revealed. A smooth regression of zircon crystallization temperature of zircon from 960 °C in the central zone to 740 °C in the marginal zone of the dipyramid sector and 700-650 °C in the prism sector has been revealed, which may be a reflection of thermal evolution of the crystallization process. It is assumed that crystallization of the central zone of zircon occurred at early stages from a relatively trace-еlement-rich melt. The crystallization was completed at lower temperatures, probably, simultaneously with the formation of REE-concentrating minerals, which resulted in natural decrease of content of trace and rare-earth elements in the melt and, consequently, in zircon crystallizing from it.

How to cite: Levashova E.V., Popov V.A., Levashov D.S., Rumyantseva N.A. Distribution of trace elements controlled by sector and growth zonings in zircon from a miaskite pegmatite of the Vishnegorsky massif, the Southern Urals // Journal of Mining Institute. 2022. Vol. 254. p. 136-148. DOI: 10.31897/PMI.2022.29
Without section
  • Date submitted
    1987-09-21
  • Date accepted
    1987-11-12
  • Date published
    1988-03-01

Системы водо- и воздухоснабжения подземных рудников и их роль в распространении блуждающих токов

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Современная технология проведения буровзрывных работ рассчитана на эк сплуатацию оборудования призабойной зоны, использу ю щего сжат ы й воздух при дав лени и 0,5-0,6 МПа и воду при давлении 0,3 П а ...

How to cite: Kudashev E.A., Dubinin A.F., Popov V.A., Berkman M.I. // Journal of Mining Institute. 1988. Vol. 117. p. 11.