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<p>In this work, we describe a new genetic occurrence of wakefieldite-(Ce) in association with monazite-(Ce) and rhabdophane-(Ce) from K-feldspar clusters in hydrothermal hematite veins of the Mys Korabl’ amethyst deposit, Kola Peninsula. According to the chemical composition, the studied wakefieldite-(Ce) has an average empirical chemical formula of (Ce<sub>0.43</sub>Nd<sub>0.19</sub>La<sub>0.16</sub>Ca<sub>0.10</sub>Pr<sub>0.05</sub>Y<sub>0.04</sub>Sm<sub>0.03</sub>)<sub>1.00</sub>(V<sub>0.89</sub>Fe<sub>0.05</sub>P<sub>0.04</sub>)<sub>0.98</sub>O<sub>4</sub>. The relationships between wakefieldite-(Ce) and REE-phosphates indicate the following sequence of mineral formation: monazite-(Ce) → wakefieldite-(Ce) → rhabdophane-(Ce). The mineral paragenesis [hydrothermal hematite, K-feldspar, rare earth element (REE) phosphates] and chemical features of the minerals in the association (REE distribution, elevated content of SO<sub>3</sub> and Cl) indicate a very high degree of oxidation of the hydrothermal solutions with significant activity of K, P and S. It is assumed that the vanadium-bearing solutions were essentially chloride-aqueous, and the source of vanadium was authigenic pore hematite from the red sandstones hosting the veins.</p>

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New genetic type of wakefieldite-(Ce) from hydrothermal hematite veins of the Mys Korabl’ amethyst deposit, Kola Peninsula

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Dmitry R. Zozulya,
  • Anna N. Solovjova,
  • Yevgeny E. Savchenko,
  • Elena S. Borisenko

摘要

In this work, we describe a new genetic occurrence of wakefieldite-(Ce) in association with monazite-(Ce) and rhabdophane-(Ce) from K-feldspar clusters in hydrothermal hematite veins of the Mys Korabl’ amethyst deposit, Kola Peninsula. According to the chemical composition, the studied wakefieldite-(Ce) has an average empirical chemical formula of (Ce0.43Nd0.19La0.16Ca0.10Pr0.05Y0.04Sm0.03)1.00(V0.89Fe0.05P0.04)0.98O4. The relationships between wakefieldite-(Ce) and REE-phosphates indicate the following sequence of mineral formation: monazite-(Ce) → wakefieldite-(Ce) → rhabdophane-(Ce). The mineral paragenesis [hydrothermal hematite, K-feldspar, rare earth element (REE) phosphates] and chemical features of the minerals in the association (REE distribution, elevated content of SO3 and Cl) indicate a very high degree of oxidation of the hydrothermal solutions with significant activity of K, P and S. It is assumed that the vanadium-bearing solutions were essentially chloride-aqueous, and the source of vanadium was authigenic pore hematite from the red sandstones hosting the veins.