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- W2016549978 abstract "Abstract A thin (100 m) cover of flat-lying, Recent, calcite-rich tuff at Ndale near Fort Portal, Uganda, unconformably overlies steeply dipping Precambrian metamorphic rocks. It is locally radioactive owing to uranium-rich pyrochlore minerals and lesser amounts of zircon, monazite, titanite, and an unidentified thorium phosphate. In one concentrate, four grains of uranpyrochlore and one grain of uranoan pyrochlore showed a positive linear correlation of Ti with U, and negative linear correlations of Ti with Na, F and Sr. Ta remained high and relatively constant [11 anal., ave. 14.5 (0.6)% Ta 2 O 5 ]. In the same concentrate the composition of a separate grain of uranoan pyrochlore did not plot on these lines and Ta was comparatively low [2 anal., ave. 4.5 (0.3)% Ta 2 O 5 ]. The data suggest two separate paths of differentiation. However, zoned grains were not observed. Unit cells were cubic with a = 10.351 ± 0.002 Å for a grain with 12.9% UO 2 tot and 10.333 ± 0.002 Å for a grain with 26.6% UO 2 tot . On heating in air the cell size decreased, possibly due to oxidation of U 4+ . The crystalline nature of these minerals can be attributed to a very young (4000–5000 yr) geological age." @default.
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- W2016549978 date "1989-04-01" @default.
- W2016549978 modified "2023-09-29" @default.
- W2016549978 title "Non-metamict uranoan pyrochlore and uranpyrochlore from tuff near Ndale, Fort Portal area, Uganda" @default.
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- W2016549978 doi "https://doi.org/10.1180/minmag.1989.053.370.14" @default.
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