Abstract
The mineralogy of active chimneys of the Vienna Woods ore field described in the preceding paper has been studied in detail. Predominant minerals are zinc sulfides (sphalerite and wurtzite), iron disulfude (pyrite and marcasite), amorphous silica, and barite, with lesser amounts of chalcopyrite and galena. The sulfide ores are enriched in silver and antimony, apparently occurring in the form of micrometer-size sulfosalts. Two mineral assemblages have been recognized: the earlier one consists of pyrite, sphalerite (or wurtzite) and chalcopyrite, and the later one includes marcasite, pyrite, sphalerite, galena and sulfosalts. The sulfide minerals display considerable variations in δ34S values, from −4.7 to +6.0‰. The ores were formed below 270° C at pH 4-5 as higher-temperature fluids mixed with seawater.
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