pyrochlore and uranpyrochlore from tuff near Ndale, Fort Portal area, Uganda D: D. HOGARTH Department of Geology...fiat-lying, Recent, calcite-rich tuff at Ndale near Fort Portal, Uganda, unconformably overlies steeply...(4000-5000 yr) geological age. KEVWORDS: Fort Portal, Ndale, Uganda, tuff, pyrochlore, uranpyrochlore, uranium...radioactivity. Introduction A pyrochlore-group mineral from Ndale was tentatively identified as 'betafite' by Newman...first example of the group to be described from tuff associated with volcanic carbonatite. During a recent |