Ages of Some Uranium and Thorium Minerals from East and ...
BS>Presented is part of a program dealing with the ages of pegmatite and vein minerals from the KibaraUrundiKaragwe Ankolean belt. Ages of sixteen pegmatite and vein minerals from Rwanda and Burundi were obtained by the strontium rubidium ( lambda = x 10/sup 11/ yr/sup 1/), leaduranium, and common lead methods.