Water extracted from fluid inclusions in quartz from shallow epithermal ore deposits often has a hydrogen isotope compositon (??D) different from that of water extracted from inclusions in associated minerals. This difference is usually attributed to the involvement of primary fluids from multiple sources. Isotopic and homogenization and freezing temperature determinations on fluid inclusions from contemporaneous quartz and sphalerite from the epithermal, silver and base metal orebodies of the OH vein, Creede district, Colorado, suggest an alternatic explanation. In near-surface deposits, differences between ??DH2O of inclusion fluids in ore minerals and quartz may result, instead, from contamination during extraction of the fluids contained in primary inclusions by shallow groundwater trapped in pseudosecondary inclusions in quartz. -from Authors
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A reinterpretation of the ??DH2O of inclusion fluids in contemporaneous quartz and sphalerite, Creede mining district, Colorodo: a generic problem for shallow orebodies?