Fluid Inclusion and Oxygen Isotope Constraints on the Origin and Hydrothermal Evolution of the Haisugou Porphyry Mo Deposit in the Northern Xilamulun District, NE China

Figure 5

Representative photomicrographs of fluid inclusions hosted in quartz of different hydrothermal stages. (a) Primary V-type fluid inclusions in P-stage quartz. (b) Linear distributed pseudosecondary fluid inclusions (along intragrain fractures) and secondary fluid inclusions (cutting through quartz grain boundaries). (c) Pseudosecondary fluid inclusions along intragrain fractures. (d) Secondary trails of fluid inclusions crosscutting quartz boundaries. (e) A P-stage S-type fluid inclusion containing a liquid phase, a vapor phase, a halite, a sylvite, and an opaque mineral. (f) Coexisting S-type, V-type, and L-type inclusions in P-stage quartz, noting opaque minerals are common in all types of inclusions. (g) Coexisting S-type and V-type inclusions in S-stage quartz. (h) Coexisting L-type and V-type inclusions in S-stage quartz. (i) and (j) L-type fluid inclusions in S-stage molybdenite-bearing quartz. (k) A P-stage S-type fluid inclusion containing a liquid phase, a vapor phase, a halite, a hematite, and an opaque mineral. (l) B-stage L-type fluid inclusions. The scale bar is 30 μm in each photomicrograph. P-, S-, and B-stage refer to pre-, syn-, and postmineralization stage, respectively.

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