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 3

Photomicrographs of representative H₂O-CO₂ fluid inclusions used for UV-fs-LA-ICP-MS analysis. (a) Fluid inclusion assemblage adjacent to a molybdenite flake in stage I quartz. Photomicrographs of the outlined fluid inclusions are shown in the left. Sample LS-540-3. (b) Fluid inclusion assemblage with coexisting solid-bearing (covellite) and solid-free fluid inclusions in stage I quartz. Note covellite is translucent in transmitted light because it occurs as very thin flakes. This was created through focus stacking which combines 3 images taken at different focus distances in order to show all the fluid inclusions in focus. Sample LS-540-3. (c)–(f) Solid-bearing fluid inclusions in stage I quartz. Sample DH-505-8 and LS-540-3. (g) Distribution of fluid inclusions in a fragment of stage III quartz crystal. Areas indicated by letters are detailed in (h) and (i). Sample 470-F7-13. (h)-(i) Fluid inclusions in stage III quartz. Anh = anhydrite, Cv = covellite, Gn = galena, and Cls = celestine.

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