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- W2145097655 abstract "Abstract Th-rich (up to 18.4 wt% ThO 2 ) loparite occurs as an accessory phase in foyaite pegmatites at Mt. Eveslogchorr, Khibina complex, Russia. It is associated with aegirine, astrophyllite, eudialyte, lorenzenite, lamprophyllite, magnesio-arfvedsonite and gerasimovskite. Loparite crystals are zoned from niobian loparite (core) to niobian thorian and thorian niobian loparite (rim). Th-enrichment is accompanied by a decrease in Na, LREE , Sr and increase in A-site vacancies. The most Th-rich composition approaches (Na 0.39 LREE 0.19 Th 0.12 Ca 0.05 Sr 0.02 ) Σ0.77 (Ti 0.76 Nb 0.27 ) Σ1.03 O 3 . The mineral is partly or completely metamict and after annealing gives an X-ray diffraction powder pattern similar to that of synthetic NaLaTi 2 O 6 and naturally occurring loparite of different composition. For the Th-rich rim sample, the five strongest diffraction lines (Å) are: 2.72 (100) 110, 1.575 (60) 211, 1.925 (40), 1.368 (30) 220, 1.222 (20) 310; a = 3.867(2) Å. The X-ray diffraction patterns do not exhibit peak splitting or other diffraction lines typical of low-symmetry and ordered perovskite-type structures. Composition determinations, infrared transmission spectroscopy and X-ray diffractometry show that thorian loparite is partly replaced by betafite with LREE and Th as dominant A -site cations (‘ceriobetafite’). Some loparite samples also exhibit thin replacement mantles of belyankinite with high LREE 2 O 3 and ThO 2 contents. Both ‘ceriobetafite’ and belyankinite were formed due to metasomatic alteration of loparite." @default.
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- W2145097655 date "1998-06-01" @default.
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- W2145097655 title "Th-rich loparite from the Khibina alkaline complex, Kola Peninsula: isomorphism and paragenesis" @default.
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- W2145097655 doi "https://doi.org/10.1180/002646198547738" @default.
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