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PHYSICAL AND CHEMICAL FEATURES OF ZIRCONS AND APATITES FROM MEDVEDEV, YUKHTA, DZHELTULA MESOZOIC ALKALINE MASSIFS (NORTH-ASIAN CRATON, SOUTHERN YAKUTIA)
Abstract
The article presents results of studies of physical and chemical features of accessory minerals (zircon, apatite) of Medvedev, Yukhta and Dzheltula Mesozoic alkaline massifs. The studied massifs are located within the Aldan-Stanovoy shield of the North-Asian craton. In the Mesozoic epoch, this area underwent tectono-magmatic activization, which caused formation of many deposits, including such unique ones as gold-uranium Elkonskoe, gold ? Lebedinskoe, Kuranakhskoe. Study of typomorphic features of zircons and apatites of the Mesozoic alkaline rocks, using new methods allow to consider number of important questions such as problems associated with the identification of formation conditions, possible metallogenic specialization of U and Th of such large complex polyphase structures. According to A.A. Krasnobaev, J. Pupin, V.V.Lyakhovich zircon and apatite classification, types and morphotypes of zircons were identified. A study of these minerals on a Camebax micro microprobe analyzer and IR Fourier-transform infrared spectroscopy (FTIR) was carried out. The studied zircons and apatites from objects under consideration are significantly different in morphologic, structural features and chemical composition. It is identified that, significantly lower concentrations of ThO2 occur, when UO2 is increased in zircons. The opposite pattern is identified in zircons, enriched with ThO2. The study of apatites from massifs revealed a difference in the occurrence of the hydroxo (OH) group in the structure of the mineral. The data obtained indicate that the typomorphism of zircons and apatites reflects formation conditions, peculiarities of host igneous rock composition and their geochemical specialization of such elements as U and Th.
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