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are derived from their chlorite crystal chemistry. The fluid composition is derived from the
crystal chemistry of chlorite and U and from REE abundance of uraninite. The origin of the
fluid is obtained from stable isotope geochemistry of chlorite and calcite in textural
equilibrium with the U mineralization. The age of each event of U mineralization corresponds
to the 207 Pb/ 206 Pb age obtained from LA-HR-ICPMS on uraninite (Dieng et al., 2011).
Cl=chlorite crystal chemistry, U=Uraninite crystal chemistry, SI=Stable isotope,
Pg=Paragenesis assemblage.
Granite-related metasomatic-type alteration affected the Gunnar granite (Figs. 3.4E
and 3.4F) and involved pervasive Ab 2 albite metasomatism. Replacement of Kfs 1 K-
feldspar is complete and precedes Qtz 1 quartz dissolution resulting in a rock exclusively
composed of Ab 2 albite (Fig. 3.4E), which is further carbonatized by Cal 5 . This calcite
occupies voids left after Qtz 1 quartz dissolution. Petrographic evidence shows that the U 3
mineralization was introduced subsequent to the albitization process and occupied space
between Ab 2 albite grains probably left after Cal 5 calcite and Qtz 1 quartz dissolution. U 3
uraninite is intergrown with Chl 5 chlorite, Src 3 sericite, Hem 5 hematite, Cal 6 calcite, Mz 1
monazite, and Ttn 2 titanite (Fig. 3.4F). Late alteration associated with Cal 7 calcite, Qtz 4
quartz and Chl 6 chlorite veins locally crosscut the mineralized albitized granite (Fig. 3.3).
Breccias are associated with the main U-mineralizing event throughout the
Beaverlodge area and result from a brittle reactivation of shear zones (Dieng et al., 2011).
The breccia is composed of variable-sized (3-4 cm), locally albitized cataclasite and
mylonite rock fragments, embedded in a Cal 8 calcite matrix (Fig. 3.4G). The matrix also
contains broken fragments of Qtz 1 quartz and Kfs 1 feldspar. U 4 uraninite is associated with
minor fine-grained (