Proposed Title 1: - Queen's University

site occupancy (Cathelineau, 1988). Syn-ore chlorites Chl 2 are similar in composition to
pre-ore Chl 1 chlorites with a calculated structural formula of Fe 3.14 Mg 1.64 Al 2.17 (Si 2.98, Al 1.02 )
O 10 (F 0.07 Cl 0.01 (OH) 7.92 ). The calculated formation temperatures are near 260°C,
indistinguishable from those of the syn-ore chlorite from the Coronation Hill deposit. Chl 1
and Chl 2 chlorites contain lower MgO and higher FeO contents relative to those from the
Coronation Hill deposit (Table 4.2). They have high Fe/Fe+Mg ratios (0.66-0.68) and low
Si contents (Table 4.2) likely reflecting the chemistry of the host cherty ferruginous shale,
which has affected the mineralizing hydrothermal fluid. Syn-ore Chl 2 chlorites have trace
amounts of F (0.16 wt%) and Cl (0.02 wt%).
4.5.3. Isotopic compositions of minerals and fluids involved in the U mineralization
Pre-ore Src 1 sericite at the Coronation Hill deposit has δ 18 O values that range from
10.1 ‰ to 14.2 ‰ and δ 2 H values between -76 ‰ and -44 ‰ (Fig. 4.11; Table 4.3). Using
a formation temperature of 160°C based on coexisting chlorite (Table 4.2), Src 1 sericite
formed in equilibrium with a fluid having δ 18 O fluid values ranging from 5.1 ‰ to 7.7 ‰ and
δ 2 H fluid values from -84 ‰ and -52 ‰ (Fig. 4.11 ; Table 4.3 ). In contrast, pre-ore Src 1
sericite at the El Sherana deposit have higher δ 18 O values near 14.2 ‰ and δ 2 H values of -
44 ‰. With a formation temperature of 300°C (Table 4.2) the fluid that equilibrated with
the pre-ore Src 1 sericite at El Sherana has δ 18 O fluid and δ 2 H fluid values of 10.7 ‰ and -60‰,
respectively.
Syn-ore Ms 2 muscovite in textural equilibrium with U 1 uranium mineralization at the
Coronation Hill deposit has δ 18 O values that range from 11.8 ‰ to 13.8 ‰ and δ 2 H values
between -85 ‰ and -67 ‰ (Fig. 4.11; Table 4.3). Using a formation temperature of 250°C
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