<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>J.J. Hemley</dc:contributor>
  <dc:contributor>W. M. d’Angelo</dc:contributor>
  <dc:creator>G.L. Cygan</dc:creator>
  <dc:date>1994</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The solubility of sphalerite (ZnS) was measured in KCl-HCl-H&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;O solutions at 300–600°C and 0.5–2.0 kbar. The silicate assemblage K-feldspar-muscovite (or andalusite)-quartz was used to buffer the solution to acid conditions, resulting in the total solubility reaction 2&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sup&gt;+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;+&amp;nbsp;&lt;/span&gt;&lt;i&gt;KAl&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;i&gt;AlSi&lt;/i&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;i&gt;O&lt;/i&gt;&lt;sub&gt;10&lt;/sub&gt;&lt;span&gt;(&lt;/span&gt;&lt;i&gt;OH&lt;/i&gt;&lt;span&gt;)&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;+ 6&lt;/span&gt;&lt;i&gt;SiO&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;+&amp;nbsp;&lt;/span&gt;&lt;i&gt;ZnS&lt;/i&gt;&lt;span&gt;&amp;nbsp;+&amp;nbsp;&lt;/span&gt;&lt;i&gt;nCl&lt;/i&gt;&lt;sup&gt;−&lt;/sup&gt;&lt;span&gt;&amp;nbsp;=&amp;nbsp;&lt;/span&gt;&lt;i&gt;ZnCl&lt;/i&gt;&lt;sub&gt;&lt;i&gt;n&lt;/i&gt;&lt;/sub&gt;&lt;sup&gt;(2−&lt;i&gt;n&lt;/i&gt;)&lt;/sup&gt;&lt;span&gt;&amp;nbsp;+ 3&lt;/span&gt;&lt;i&gt;KAlSi&lt;/i&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;i&gt;O&lt;/i&gt;&lt;sub&gt;8&lt;/sub&gt;&lt;span&gt;&amp;nbsp;+&amp;nbsp;&lt;/span&gt;&lt;i&gt;H&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;i&gt;S&lt;/i&gt;&lt;span&gt;. (muscovite) (quartz) (sphalerite) (K-feldspar) A computer retrieval technique was used to derive average chloride ligand numbers for chlorozinc species at 0.25–2.0 molal total chloride. This technique mathematically solves for the average ligand number using a series of pertinent chemical relations at&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;/i&gt;&lt;span&gt;. Mono- and di-chlorozinc species were found to predominate throughout the pressure-temperature-composition range investigated. The logarithms of the first and second dissociation constants for ZnCl&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;span&gt;&amp;nbsp;were evaluated over the&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt;-&lt;/span&gt;&lt;i&gt;T&lt;/i&gt;&lt;span&gt;&amp;nbsp;range; for example, at 1 kbar, the values −0.41 and −1.42 were computed for the logarithm of the first dissociation constant, while −7.62 and −10.57 were computed for the logarithm of the second dissociation constant, for 400 and 500°C, respectively. Results are compared to past studies conducted at subcritical conditions and differ in that we find no evidence for more highly coordinated chloro-zinc species except possibly for ZnCl&lt;/span&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;−&lt;/sup&gt;&lt;span&gt;&amp;nbsp;at 600°C, 1 and 2 kbar. Our results are consistent with electrostatic theory, which favors lower charged to neutral molecules in low dielectric-constant media.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0016-7037(94)90215-1</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>An experimental study of zinc chloride speciation from 300 to 600 °C and 0.5 to 2.0 kbar in buffered hydrothermal solutions</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>