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 2

Hand-specimen photographs from the Haisugou Mo deposit showing the granite and the alteration and vein types from different hydrothermal stages. (a) Polished granite sample showing the major minerals including plagioclase, quartz, K-feldspar, biotite, and amphibole. (b) Barren quartz-K-feldspar veinlets in granite recording the earliest hydrothermal alteration in Haisugou. (c) Mafic microgranular enclaves in granite. (d) Garnet-pyroxene skarn in limestone in the contact zone between the country rocks and the granite. (e) Slightly mineralized P-stage quartz vein with K-feldspar halos. (f) S-stage quartz-sericite-molybdenite vein. (g) S-stage molybdenite-quartz-calcite-sericite vein. (h) S-stage quartz-molybdenite vein with chlorite and epidote halos. (i) Hydrothermal breccias containing clasts of S-stage molybdenite-quartz-sericite-chlorite aggregates cemented by B-stage barren quartz and fluorite. (j) Hydrothermal breccias containing clasts of S-stage molybdenite-quartz-chlorite aggregates cemented by B-stage barren quartz. The scale bar is 1 cm in each photograph. Cal: calcite; Chl: chlorite; Ep: epidote; Fl: fluorite; Grt: garnet; Kfs: K-feldspar; MME: mafic microgranular enclave; Mol: molybdenite; Pyx: pyroxene; Qtz: quartz; Ser: sericite.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)