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Syn-ore Chl 8
chlorite sampled from the volcanic-type U 6 mineralization has a
narrow range of δ 18 O values between 6 per mil and 10.4 per mil and a wide range of δ 2 H
values comprising between -126 per mil and -71 per mil (Table 3.6). Using a formation
temperature of 320°C (Table 3.3), δ 18 O fluid and δ 2 H fluid values for the equilibrium fluid
range from 5.8 per mil to 10.2 per mil and -99 per mil to -44 per mil, respectively (Fig.
3.8; Table 3.6). Chl 8 chlorite also records late alteration associated with the influence of
modern meteoric water (Fig. 3.8). In contrast, Syn-ore Chl 9 chlorite in Athabasca-type U 6
mineralization has the lowest δ 18 O values that range from 2.8 per mil to 7.7 per mil and
δ 2 H values comprising between -87 per mil and -63 per mil (Table 3.6). These values
indicate formation in equilibrium with brines having δ 18 O fluid values of 1.5 per mil to 6.3
per mil and δ 2 H fluid values of -60 per mil to -38 per mil based on a formation temperature
of 235°C (Fig. 3.8; Table 3.6). The calculated values of δ 18 O fluid and δ 2 H fluid are similar to
those from unconformity-type U mineralization in the proximal Athabasca Basin (Wilson
and Kyser, 1987; Kotzer and Kyser, 1995).
3.4.4. Rare earth elements (REE) geochemical characteristics of the U mineralization
REE contents of uraninite can constrain the origin and evolution of mineralizing
fluids (Alexander et al., 2010; Mercadier et al., 2011). Based on REE patterns, several
distinctions can be made between different types of U-mineralizing events. For example,
the REE contents in the granite-related metasomatic-type U 3 uraninite at Gunnar are high
(17834 ppm, Tables 3.7 and 3.8; Fig. 3.9B) and chondrite-normalized REE patterns
indicate a slight LREE enrichment (La/Yb) N =5.8, Figs. 3.9A and 3.10A) and pronounced
negative Eu and Ce anomalies (Eu/Eu*=0.1 and Ce/Ce*=0.1, Fig. 3.10A). In contrast, U 2
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