Abnormally high-hafnium zircon from rare-metal pegmatites of the Vasin-Mylk deposit (the northeastern part of the Kola Peninsula)

Kudryashov, N. M.; Скублов, С. Г.; Галанкина, О. Л.; Удоратина, О. В.; Voloshin, A. V.

doi:10.1016/j.geoch.2018.12.001

Cited by 17 publications

(11 citation statements)

References 30 publications

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“…Al, K, La, Pb, Sc and V below detection in all analyses. Jacobsen et al 2007;Yin et al 2013;Kudryashov et al 2020). This fractionation of Hf from Zr at the late hydrothermal stages has been linked to the lower mobility of Hf (Gerasimovskiy et al 1972;Smith et al 1987;Wang et al 2010).…”

Section: Discussion: Hydrothermal Fluidsmentioning

confidence: 99%

Acta Geologica Polonica

Cegiełka,

Bagiński,

Macdonald

et al. 2022

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Compositional and textural data are presented for zircon, secondary Zr-silicates, catapleiite and elpidite in a peralkaline granite from the Ilímaussaq complex, south Greenland. The zircon is essentially stoichiometric, with (Zr + Hf + Si) = 1.96–1.98 a.p.f.u. The secondary Zr-silicates show a wide range of Zr/Si atomic ratios (0.13–0.79). The catapleiite varies from close to stoichiometric to a Na-depleted type showing cation deficiency (5.2–5.8 a.p.f.u.). Elpidite shows similar variations (7.2–9.0 a.p.f.u.). Textural relationships between the Zr phases are interpreted to show that magmatic zircon interacted with hydrous fluids exsolved from the magma to form the secondary Zr-silicates. Formation of catapleiite was late‑magmatic, in equilibrium with a Na-Sibearing fluid. This was followed by the crystallization of elpidite, the fluid having a different Na/Si ratio. Both catapleiite and elpidite experienced Na-loss during late-stage hydrothermal alteration.

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Section: Discussion: Hydrothermal Fluidsmentioning

confidence: 99%

Acta Geologica Polonica

Cegiełka,

Bagiński,

Macdonald

et al. 2022

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“…The Hf contents in Giraúl pegmatites can be relatively high in some pegmatites, up to 12 wt.%, although never reaching proportions close to the field of hafnon (HfSiO4) and clearly lower than those from other evolved pegmatite fields [53,54]. Extremely Hf-rich contents were reported with up to more than 48 wt.% Hf in the rare-metal pegmatites of the Vasin-Mylk deposit, in the Kola peninsula [55]. The content of Hf in zircon usually is correlated with the content of Ta in the CGM with which it is associated, thus, it is a good criterion in the exploration of rare elements [15,[56][57][58].…”

Section: Evolution Of Zircon In the Giraúl Pegmatitesmentioning

confidence: 92%

The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola

et al. 2019

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The Giraúl granitic pegmatite field in Angola is composed of five pegmatite types, the most evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain size toward a quartz core; the most evolved pegmatites have well-developed replacement units. These pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements such as Ta and Hf. Tourmaline, garnet and micas occur as accessory minerals. The abundance of Zr and Nb-Ta minerals increases with the evolution of the pegmatites, as well as the proportions of beryl and Li-rich minerals. The Ta/(Ta + Nb) ratio in Nb-Ta oxide minerals and the Hf/(Hf + Zr) ratio in zircon also increase with the evolution of the pegmatites and within each pegmatite body from border to inner zones, and especially in the late veins and subsolidus replacements. Textural patterns and occurrence of late veins with Ta-rich minerals suggest that Nb and especially Ta can be enriched in late hydrothermal fluids exsolved from the magma, along with Hf and other incompatible elements as Sn, U, Pb, Sb and Bi.

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“…The electron-microscopic studies have already shown that all zircon types from Verkhneurmiysky granites show anomalously high concentrations of U, Th, REE, and Y. According to many researchers [46][47][48], the probability of finding these elements in the structure of zircon as an isomorphic impurity is small; whereas they rather form their own minerals enclosed in the zircon matrix. From this point of view, anomalous U, Th, REE, and Y concentrations associated with their own minerals (uraninite, coffinite, thorite, monazite, allanite, etc.…”

Section: Zircon From Li-f Granitesmentioning

confidence: 99%

Complex Characteristic of Zircon from Granitoids of the Verkhneurmiysky Massif (Amur Region)

2021

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The study presents a complex characteristic of zircon from the Verkhneurmiysky intrusive series with Li-F granites. A wide range of morphological and chemical properties of zircon allowed us to obtain new information on the formation and alteration of zircon from biotite and zinnwaldite granitoids and to determine its features, which contribute to the correct definition of Li-F granites formed directly before the tin mineralization. The reviled trends of zircon morphology and composition evolution in the Verkhneurmiysky granites series are: the high-temperature morphotypes are followed by low-temperature ones with more complicated internal structure with secondary alteration zones, mineral inclusions, pores, and cracks; the increasing concentration of volatile (H2O, F), large ion lithophile (Cs, Sr), high field strength (Hf, Nb) and rare-earth elements with decreasing crystallization temperatures and the determining role of the fluid phase (predominantly, F) in the trace element accumulation. The composition of zircon cores in biotite and zinnwaldite granites is very similar. However, the zircon rims from zinnwaldite granites are much more enriched in trace elements compared to those from biotite granites. The first study of zircon from the Verkhneurmiysky granitoids provides new data on the formation and alteration conditions of granitoids, including zinnwaldite ones.

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Abnormally high-hafnium zircon from rare-metal pegmatites of the Vasin-Mylk deposit (the northeastern part of the Kola Peninsula)

Cited by 17 publications

References 30 publications

Acta Geologica Polonica

Acta Geologica Polonica

The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola

Complex Characteristic of Zircon from Granitoids of the Verkhneurmiysky Massif (Amur Region)

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