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 3

Representative photomicrographs from the Haisugou Mo deposit showing the alteration and mineralization in different hydrothermal stages. (a) Photomicrograph of the Haisugou granite showing the major phenocryst minerals. (b) Plagioclase of the granite altered to sericite and calcite. (c) P-stage barren quartz vein surrounded by K-feldspar halos. (d) Hornblende of the granite altered to magnetite and chlorite. (e) S-stage quartz-calcite-molybdenite vein with chlorite halos. (f) S-stage quartz-molybdenite-chlorite-epidote vein with sericite halos. (g) S-stage molybdenite-quartz-sericite vein. (h) Molybdenite flakes in S-stage quartz vein. (i) Molybdenite flakes and chalcopyrite in S-stage breccia ores. (a), (b), (f), and (g) were taken under crossed polarized light, (c), (d), and (e) under plane polarized light, and (h) and (i) under reflected light. The scale bar is 0.5 mm in each photomicrograph. Bt: biotite; Cal: calcite; Ccp: chalcopyrite; Chl: chlorite; Ep: epidote; Hbl: hornblende; Kfs: K-feldspar; Mag: magnetite; Mol: molybdenite; Pl: plagioclase; Qtz: quartz; Ser: sericite.

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