Uranium-series disequilibrium studies of granitic rocks

Igneous plutons of the Canadian Shield which are to be considered as possible storage sites for radioactive waste, should be free from any evidence of past mobility of chemical species through the rock. However, cores taken from some plutons, to depths of up to 1 km, reveal the presence of hydrous low-temperature alteration along joints and fractures, and within the body of the rock. To test whether such rocks, or any others, have been …