Geology, Mineralogy, Fluid Inclusion, and H–O–S–Pb Isotope Constraints on Ore Genesis of the Keyue Sb–Pb–Zn–Ag Deposit in Southern Tibet

Figure 4

Hand specimen photographs of representative samples from the Keyue Sb–Pb–Zn–Ag deposit. (a) Assemblage 1 lamellar sphalerite–pyrite–arsenopyrite and assemblage 2 massive and banded sphalerite–pyrite–galena hosted by Mn–Fe carbonate. (b) Assemblage 1 lamellar sphalerite–pyrite–arsenopyrite hosted by Mn–Fe carbonate, later assemblage 4 quartz–boulangerite veins cut the Mn–Fe carbonate; this sample also contains massive assemblage 4 quartz–boulangerite. (c) Assemblage 1 disseminated pyrite and chalcopyrite hosted by assemblage 1 Mn–Fe carbonate, later assemblage 4 quartz–boulangerite veins cut the Mn–Fe carbonate. (d) Banded assemblage 2 Mn–Fe carbonate–sphalerite–pyrite ore that contains some assemblage 3 quartz. (e) Massive assemblage 2 Mn–Fe carbonate–sphalerite–pyrite–galena ore. (f) Massive assemblage 2 coarse-grained sphalerite–galena–chalcopyrite ore. (g) Massive and banded assemblage 2 Mn–Fe carbonate–sphalerite–pyrite–galena ore. (h) Assemblage 2 coarse-grained galena–sphalerite–chalcopyrite. (i) Massive assemblage 2 Mn–Fe carbonate–sphalerite–chalcopyrite–pyrite–galena ore that is cut by a later assemblage 4 quartz–boulangerite vein. (j) Veined assemblage 3 quartz–sphalerite–galena–chalcopyrite ore that is cut by a later assemblage 4 quartz–boulangerite vein. (k) Assemblage 3 massive quartz–sphalerite–galena–chalcopyrite ore. (l) Assemblage 3 coarse-grained pyrite–chalcopyrite occurs in assemblage 3 quartz; this sample also contains minor assemblage 2 Mn–Fe carbonate. (m) Assemblage 3 massive quartz–chalcopyrite ore that contains some assemblage 4 quartz–bournonite. (n) Assemblage 3 chalcopyrite replaced by assemblage 4 quartz–tetrahedrite–freibergite. (o) Assemblage 4 boulangerite and assemblage 3 chalcopyrite–quartz replace assemblage 2 Mn–Fe carbonate. (p) Veined assemblage 4 boulangerite–jamesonite replace assemblage 3 massive coarse–grained galena. (q) Massive assemblage 4 quartz–boulangerite–jamesonite ore. (r) Radial assemblage 5 stibnite hosted by assemblage 5 quartz. (s) Assemblage 5 stibnite replaced by assemblage 6 quartz–calcite vein. (t) Geyserite and valentinite formed by the supergenetic oxidation of assemblage 5 quartz–stibnite–cinnabar ore. Mcar1 = assemblage 1 fine-grained Mn–Fe carbonate; Apy1 = assemblage 1 lamellar arsenopyrite; Py1 = assemblage 1 lamellar pyrite; Sp1 = assemblage 1 lamellar sphalerite; Ccp1 = assemblage 1 chalcopyrite; Mcar2 = assemblage 2 coarse-grained Mn–Fe carbonate; Py2 = assemblage 2 pyrite; Sp2 = assemblage 2 sphalerite; Gn2 = assemblage 2 galena; Ccp2 = assemblage 2 chalcopyrite; Py3 = assemblage 3 pyrite; Sp3 = assemblage 3 sphalerite; Gn3 = assemblage 3 galena; Ccp3 = assemblage 3 chalcopyrite; Qtz3 = assemblage 3 quartz; Blr4 = assemblage 4 boulangerite; Jmt4 = assemblage 4 jamesonite; Bnn4 = assemblage 4 bournonite; Ttr4 = assemblage 4 tetrahedrite; Fbt4 = assemblage 4 freibergite; Qtz4 = assemblage 4 quartz; Stb5 = assemblage 5 stibnite; Ci5 = assemblage 5 cinnabar; Qtz5 = assemblage 5 quartz; Cal6 = assemblage 6 calcite; Qtz6 = assemblage 6 quartz.

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