Abstract
Secondary textures formed in natural zircon crystals under the influence of hydrothermal solutions are interpreted as products of metasomatic substitution. Such textures are clearly seen in metamict zircons and zircons enriched in radioactive elements, which are often found in potassic granites, pegmatites, and other rocks with high U and Th contents. Specific secondary textures in zircons contained in microcline granites, metasedimentary and eclogite-like rocks of the Kola Peninsula are reviewed. Detailed mineralogical and geochemical studies of zircons (CL, BSE, microprobe analysis of incompatible elements) have been carried out with the subsequent U-Pb dating of different zircon zones. The mechanism of secondary texture formation is considered in terms of metasomatic isomorphic substitution. Analogy between natural structure of zircon and products of experimental isomorphic substitution makes it possible to obtain additional information on conditions of the natural zircon growth important for interpreting geochronological data. When metamict zircons are substituted without gaining new material and with a decrease in volume, the U-Pb age of initial zircon remains unchanged and the lower intercept of discordia and concordia corresponds to the time of fluid impact. Substitution with a gain in matter is accompanied by excess volume. In this case, the timing of zones of transitional composition is devoid of geological sense.
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Original Russian Text © T.V. Kaulina, M.Yu. Sinai, E.E. Savchenko, 2011, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2011, no. 1, pp. 36–48.
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Kaulina, T.V., Sinai, M.Y. & Savchenko, E.E. Metasomatic replacements and isotope relationships in zircon crystals and crystallogenetic models. Geol. Ore Deposits 53, 735–744 (2011). https://doi.org/10.1134/S1075701511080071
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DOI: https://doi.org/10.1134/S1075701511080071