Replacement of zircon with baddeleyite as a likely mechanism of the formation of zoned zircon crystals in ultrabasic rocks
- Authors: Anfilogov V.N.1, Krasnobaev A.A.2, Ryzhkov V.M.1, Valizer P.M.3
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Affiliations:
- Institute of Mineralogy, Ural Branch
- Zavaritsky Institute of Geology and Geochemistry, Ural Branch
- Ilmeny State Reserve, Ural Branch
- Issue: Vol 475, No 2 (2017)
- Pages: 946-948
- Section: Geochemistry
- URL: https://ogarev-online.ru/1028-334X/article/view/190580
- DOI: https://doi.org/10.1134/S1028334X17080219
- ID: 190580
Cite item
Abstract
The problem of the U–Pb age of zircon crystals from ultrabasic rocks is discussed in this paper. It is shown that the assumption on the xenogenic nature of zircon crystals in dunite is not consistent with the petrographic and experimental data. The results of experimental study of the zircon–baddeleyite transition and thermodynamics of the reaction of zircon replacement with baddeleyite show that these transformations are the likely way of the formation of zoned zircon crystals in dunite. Each zone of these crystals may have its own age.
About the authors
V. N. Anfilogov
Institute of Mineralogy, Ural Branch
Email: Ryzhkov_v_m@mail.ru
Russian Federation, Chelyabinsk oblast, Miass, 456317
A. A. Krasnobaev
Zavaritsky Institute of Geology and Geochemistry, Ural Branch
Email: Ryzhkov_v_m@mail.ru
Russian Federation, Yekaterinburg, 620016
V. M. Ryzhkov
Institute of Mineralogy, Ural Branch
Author for correspondence.
Email: Ryzhkov_v_m@mail.ru
Russian Federation, Chelyabinsk oblast, Miass, 456317
P. M. Valizer
Ilmeny State Reserve, Ural Branch
Email: Ryzhkov_v_m@mail.ru
Russian Federation, Chelyabinsk oblast, Miass, 456317
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