New data on pyrochlore from the Tatarka deposit (Yenisei Ridge, Russia)
V.I. Popova, P.S. Kozlov, A.V. Lapin, V.A. Popov, V.A. Kotlyarov,
L.A. Pautov, M.A. Rassomakhin, V.V. Shilovskikh, I.A. Blinov
UDК 549:553 (571.51)
Large pyrochlore crystals (up to 6 cm) from ores of the Tatarka deposit are studied, as well as their compositional zoning and relations with associated minerals. pyrochlore was crystallized along with calcite, magnetite, fuoromagnesioarfvedsonite, zircon and some other minerals. The central part of the pyrochlore crystals corresponds to fuorcalciopyrochlore, which alternates with Sr-bearing hydroxycalciopyrochlore zones in the periphery. pyrochlore crystals from the periphery and along the cracks were altered with noticeable defcit in position A. In addition to the minerals known at the deposit, monazite-(Ce), aeschynite-(Y), nosean, natrolite, gold, siderite, ankerite, fe-bearing aluminosilicate – chamosite, kaolinite, illite are found.
Figures 12. Tables. 2. References 9.
Key words: fuorcalciopyrochlore, compositional zoning, mineral assemblages, carbonatite-peg-matite, carbonatites, Tatarka deposit, Yenisei Ridge, Russia.
МINERALOGY № 1 2017