Geochemistry of Melt Inclusions in Zircon from Azov Zr-REE Deposit (Ukrainian Shield)

Левашова, Е. В.; Voznyak, D.K.; Скублов, С. Г.; Каулина, Т. В.; Kulchytska, H.O.; Галанкина, О. Л.

doi:10.15407/mineraljournal.41.02.045

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…5b). It was determined for natural conditions and experimentally that such incompatible elements as Zr, REE, Y, and Nb could be mobile in the alkali-and F-rich magmatic systems (Yang et al, 2014;and references therein), and could be accumulated in a highly evolved melt Williams-Jones, 1996, 2006;Jiang et al, 2005), as was established for the Azov massif (Voznyak et al, 2010Levashova et al, 2019). The enrichment in the aforementioned elements likely is a characteristic feature of zircon from alkaline granites and syenites, which crystallized during interaction with a fluid-saturated melt.…”

Section: Resultsmentioning

confidence: 95%

First Age and Geochemical Data on Zircon from Riebeckite Granites of the Verkhnee Espe Rare Earth–Rare Metal Deposit, East Kazakhstan

et al. 2022

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This paper is dedicated to the isotope-geochemical study of zircon from riebeckite granites of the Verkhnee Espe rare earth-rare metal deposit and the specification of its U–Pb age. Zircon from the Verkhnee Espe massif is peculiar in the high content of non-formula elements (up to 43000 ppm REE, up to 22000 Y, and others) and demonstrates a clearly expressed heterogeneous structure. The central and rim zones of the zircon show a “magmatic” rare-earth element (REE) distribution. The intermediate zones are characterized by a flattening of the REE patterns and an anomalous enrichment in REE, Y, Nb, and Ca. This compositional feature of the zircon may be caused by impact of fluid-saturated granite melts enriched in incompatible trace elements. The δ18О values in the zircon are 5.83–7.16‰, which generally corresponds to zircon formed from granitoid melts. The age of zircon from the Verkhnee Espe rare earth–rare metal deposit is 283 ± 3 Ma, which indicates that there is no significant age gap between granite crystallization, on the one hand, and metasomatic processes and ore generation, on the other.

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Section: Resultsmentioning

confidence: 95%

First Age and Geochemical Data on Zircon from Riebeckite Granites of the Verkhnee Espe Rare Earth–Rare Metal Deposit, East Kazakhstan

et al. 2022

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Trace Element Geochemistry of Zircons from the Velyka Vyska Syenite Massif, Ukrainian Shield

Левашова¹,

Kulchytska²,

Скублов³

et al. 2020

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Zircon crystals from crushed syenite samples of individual intrusive bodies in the Velyka Vyska Massif were studied using the SEMEDS (BSE images and chemistry) and SIMS methods. The results obtained were compared with early published data for zircon from the Azov and Yastrubets syenite massifs, Ukrainian Shield that host ZrREE mineralization published earlier. Most of the zircon crystals analyzed are chemically inhomogeneous, but either azonal or show poorlydefined regular zoning. A darker

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Formation Mechanism of the Velyka Vyska Syenite Massif (Korsun-Novomyrhorod Pluton, Ukrainian Shield) Derived from Melt Inclusions in Zircon

Voznyak¹,

Левашова²,

Скублов³

et al. 2021

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The formation of leucosyenites in the Velyka Vyska syenite massif was provoked by the liquation layering of magmatic melt. This assumption is based on the presence of two primary melt inclusions of different chemical composition in zircon crystals from Velyka Vyska leucosyenites. They correspond to two types of silicate melts. Type I is a leucosyenite type that contains high SiO2 concentrations (these inclusions dominate quantitatively); type II is a melanosyenite type that contains elevated Fe and smaller SiO2 concentrations. The liquation layering of magmatic melt was slow because the liquates are similar in density; leucosyenite melt, which is more abundant than melt of melanosyenite composition, displays greater dynamic viscosity; the initial sizes of embryos of melanosyenite composition are microscopic. Sulphide melt, similar in composition to pyrrhotite, was also involved in the formation of the massif. Zircon was crystallized at temperatures over 1300°С, as indicated by the homogenization temperatures of primary melt inclusions. The REE distribution spectra of the main parts (or zones,) of zircon crystals from the Velyka Vyska massif are identical to those of zircon from the Azov and Yastrubets syenite massifs with which high-grade Zr and REE (Azov and Yastrubets) ore deposits are associated. They are characteristic of magmatically generated zircon. Some of the grains analyzed contain rims that are contrasting against the matrix of a crystal, look dark-grey in the BSE image and display flattened REE distribution spectra. Such spectra are also typical of baddeleyite, which formed by the partial replacement of zircon crystals. The formation of a dark-grey rim in zircon and baddeleyite is attributed to the strong effect of high-pressure СО2-fluid on the rock. The formation patterns of the Velyka Vyska and Azov massifs exhibit some common features: (а) silicate melt liquation; (b) high ZrO2 concentrations in glasses from hardened primary melt inclusions; (c) the supply of high-pressure СО2-fluid flows into Velyka Vyska and Azov hard rocks. Similar conditions of formation suggest the occurrence of high-grade Zr and REE ores in the Velyka Vyska syenite massif.

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Geochemistry of Melt Inclusions in Zircon from Azov Zr-REE Deposit (Ukrainian Shield)

Cited by 3 publications

References 16 publications

First Age and Geochemical Data on Zircon from Riebeckite Granites of the Verkhnee Espe Rare Earth–Rare Metal Deposit, East Kazakhstan

First Age and Geochemical Data on Zircon from Riebeckite Granites of the Verkhnee Espe Rare Earth–Rare Metal Deposit, East Kazakhstan

Trace Element Geochemistry of Zircons from the Velyka Vyska Syenite Massif, Ukrainian Shield

Formation Mechanism of the Velyka Vyska Syenite Massif (Korsun-Novomyrhorod Pluton, Ukrainian Shield) Derived from Melt Inclusions in Zircon

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