Proposed Title 1: - Queen's University

Textural evidence suggests that retrograde Chl 1
chlorite predominantly replaced
earlier metamorphic Bt 1 biotite and Hbl 1 amphibole in altered metasedimentary and
feldspar-amphibole rocks at Cinch Lake (Dieng et al., 2011). Chl 1 chlorite has high Mg
and Fe contents (19.45 and 19.74 wt. % respectively, Table 3.3), which supports
inheritance of the chemistry of Bt 1 biotite into the Chl 1 chlorite. Chl 1 chlorites have a
composition typical of Fe-clinochlore with a calculated formation temperature of ca.
200°C (Table 3.3). They have high SiO 2 contents (30.25 wt. %), uniform Fe/Al and Mg/Al
ratios and an average Fe/(Mg + Fe) ratio of 0.36, similar to the composition of retrograde
metamorphic chlorite reported by Tortosa (1983) at the Cenex mine. The chemical
composition of Chl 1 chlorite indicates that the fluid from which it formed contained Ca
and F (Table 3.3).
Chl 4 chlorite in early tensional vein-type U 2 mineralization has high Mg contents
(17.03 wt.%) and the lowest Fe contents (14.17 wt.%). These chlorites have the lowest but
relatively uniform Fe/Al, Mg/Al and Fe/Mg ratios and a calculated formation temperature
of ca. 310°C (Table 3.3). Chl 4 chlorites are Ca-F-rich and have an average Fe/(Mg+Fe)
ratio of 0.32 that is indistinguishable from retrograde Chl 1 chlorite.
Syn-ore Chl 5 chlorite in granite-related metasomatic-type U 3 at the Gunnar deposit
has high Mg and Al contents (18.17 wt.% and 19.41 wt.%, respectively) and low Fe
contents (20.58 wt.%, Table 3.3, Fig. 3.6C) with a calculated formation temperature of ca.
315°C. They have relatively uniform Fe/Al, Mg/Fe, and Mg/Al ratios and their low Fe/(Fe
+ Mg) ratios (0.37 to 0.43) attest to the Mg-rich and Fe-poor composition of the fluid.
Fluids in equilibrium with Chl 5 chlorite were relatively enriched in Ca, and F (Table 3.3;
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