Format:
Online-Ressource
ISSN:
1945-3027
Content:
Abstract: We provide an experimental confirmation of the suggestion, based on thermodynamic simulations and extrapolations (Zhong et al. 2015), that Zn is transported in the form of chloride complexes in most acidic, shallow hydrothermal systems; while bisulfide complexes become increasingly important in deep, pH neutral to basic hydrothermal systems. We used in situ X‑ray absorption spectroscopy (XAS) diamond-anvil cell experiments to determine Zn (II) speciation in a 1 m NaHS + 0.2 m HCl solution in contact with sphalerite. XANES data indicate that Zn coordinates to oxy/hydroxyl/chloride ligands from room temperature up to and including 200 °C, and then at higher temperatures (≥300 °C) and pressures (〉2 kbar) it changes to complexing with sulfur. Our data confirm that bisulfide complexes become increasingly important in neutral-alkaline solutions at high pressure and temperature, due to an increase in sulfur solubility and to favorable entropy contributions for bisulfide vs. chloride complexes.
In:
volume:104
In:
number:1
In:
year:2019
In:
pages:158-161
In:
extent:4
In:
American mineralogist, Berlin : de @Gruyter, 1916-, 104, Heft 1 (2019), 158-161 (gesamt 4), 1945-3027
Language:
English
DOI:
10.2138/am-2019-6719
URN:
urn:nbn:de:101:1-2404201612246.843754251284
URL:
https://doi.org/10.2138/am-2019-6719
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2404201612246.843754251284
URL:
https://d-nb.info/1326785508/34
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