UV-fs-LA-ICP-MS Analysis of CO₂-Rich Fluid Inclusions in a Frozen State: Example from the Dahu Au-Mo Deposit, Xiaoqinling Region, Central China

Figure 2

Vein mineralogy of Dahu stage I and stage III mineralization. (a) Stage I quartz crystals with abundant molybdenite mineral inclusions. Sample LS-540-3. (b) Backscattered electron (BSE) image showing molybdenite occurring as larger mineral inclusions in stage I quartz while Cu_1.65S and bornite occur as smaller solids in opened fluid inclusions. Sample LS-540-3. (c)–(e) BSE images and (f) plane-polarized reflected light photomicrograph showing solids including molybdenite, Cu_1.65S, covellite, bornite, and anhydrite in opened fluid inclusions in stage I quartz. Sample LS-540-3. (g) Stage III quartz crystals in contact with galena. Sample 470-F7-13. (h) Plane-polarized reflected light photomicrograph showing aggregate of altaite, greenockite, and petzite in galena. Sample 470-F7-13. (i) Plane-polarized reflected light photomicrograph showing gold and tellurides in galena. Sample 400-10. Alt = altaite, Anh = anhydrite, Au = gold, Bn = bornite, Buck = buckhornite, Cv = covellite, Clv = calaverite, Fi = fluid inclusion, Gck = greenockite, Gn = galena, Mo = molybdenite, Ptz = petzite, Py = pyrite, Qtz = quartz, and Tlb = tellurobismuthite.

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