On the possibility of determining rates of removal of uranium from crystalline igneous rocks using U-series disequilibria—2: applicability of a U-leach model to mineral separates

Preliminary U-series data are presented on the disequilibria of mineral separates of surface samples from the Eye-Dashwa lakes granite (Canada). Most analyses of the ferromagnesian, quartz-plus-feldspar, and zircon-plus-sphene grains, show that leaching of U has taken place such that234U/239U≤ 1 and 230Th/234U 1. The simple leach model presented in a companion paper was used to explain these characteristic ratios. It is suggested that the leach …