Origin and Evolution of the Ore-Forming Fluids in the Liyuan Gold Deposit, Central North China Craton: Constraints from Fluid Inclusions and H-O-C Isotopic Compositions

Figure 3

Photographs showing the mineral assemblages and cross-cutting relationships of different mineralization stage at the Liyuan gold deposit. (a) Early stage quartz vein cut a diabase dike. (b) Pyrite-sericite-quartz alteration in the early stage. (c) Early stage pyrite-quartz vein in association with K-feldspar alteration. (d) Early stage quartz vein cross cut by late stage quartz-carbonate vein, while the middle stage quartz-polymetallic vein was infilled by late stage quart-carbonate vein. (e) Early stage ore-barren quartz vein cemented by late stage quartz-carbonate vein. (f) Middle stage quartz-polymetallic vein occurring in pyrite-sericite-quartz alteration rock. (g) The Middle stage quartz-polymetallic vein. (h) The broken and brecciated pyrite-sericite-quartz rock and chlorite-altered rock fulfilled by late stage carbonate. (i) Late stage quartz-carbonate veinlets filling the extension joints in sericite-quartz alteration rock.

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