## 6 Results
### Fluid Inclusion Study  
A fluid inclusion study was conducted on quartz from A- and E-type veins and on hydrothermal quartz grains related to sericitic alteration associated with the porphyry mineralization and the epithermal overprint, respectively. Samples of A-type veins cross-cutting quartz monzonite were obtained from the surface (Vath 31c) and from drill core H4 (Vath 40). Samples of E-type veins were collected from cataclasite at the surface (Vath 33) and from drill cores H4 (sample Vath 41) and H5 (sample Vath 42). Hydrothermal quartz in the sericitic alteration was derived from the surface (sample Vath 12a). D-type veins are devoid of fluid inclusions. Figure 15: SEM back-scattered electron images of secondary minerals from the oxidation zone: (**a**) Turquoise (Turq), senaite (Sen), and rutile (Rt) along the cleavage of sericite (Ser); (**b**) Woodhouseite (Wdh) and turquoise (Turq) in a cavity in latite. Quartz in the veins and latite is mainly equigranular, anhedral, and it possesses a polygonal shape. The contacts among quartz grains form triple junctions with angles at \(\approx\)120\({}^{\circ}\) (Figure 17a). This implies that the quartz was extensively recrystallized so that the fluid inclusions largely migrated to grain boundaries [61]. As a result, fluid inclusions at Vathi are scarce, and only five of eight samples contained workable inclusions. Where present, fluid inclusions are concentrated in clusters (Figure 17b) and are considered to be primary, on the basis of the criteria proposed by [PERSON] [62] and [PERSON] [63]. These criteria include constant liquid to vapor ratios and similar shapes and sizes of the inclusions. Primary fluid inclusions found along growth zones of quartz crystals are rare, and their size is too small for microthermometry. Inclusions that occur in planes along healed fractures (Figure 17c) are considered to be secondary and possibly reflect fluid circulation associated with a late stage of fluid entrapment. The primary inclusions are elliptical to rounded and sometimes irregular in shape. Their maximum diameter is 35 \(\upmu\)m, but the vast majority range in size from 5 to 15 \(\upmu\)m.  
On the basis of phase ratios observed at room temperature and phase transitions during homogenization, four types of fluid inclusions are present in the early-stage A-type veins and the hydrothermal quartz of the host rock: two-phase liquid-rich aqueous (Type 1), multiphase halite-bearing (Type 2), two-phase vapor-rich aqueous (Type 3), and one-phase vapor only (Type 4) inclusions. Figure 16: Distribution of copper, molybdenum, gold, and uranium in the Vathi porphyry-type deposit (see Figures 3 and 9). Type 1 two-phase aqueous inclusions contain a vapor bubble occupying 20-30 vol.% (Figure 17d), which homogenize into the liquid phase during heating. These inclusions occur in A-type veins and are rare and secondary in origin, although some primary inclusions occur in the hydrothermal quartz grains in latite. Type 2 inclusions are multiphase and consist of liquid, vapor, and one or more daughter crystals consisting mostly of halite and rare sylvite, or other unidentified transparent daughter minerals or an opaque (Figure 17e-h). The vapor phase occupies 20-40 vol.% of the inclusions, which homogenize into the liquid phase.