<?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:creator>Gene Whitney</dc:creator>
  <dc:date>1992</dc:date>
  <dc:description>&lt;p&gt;Hydrothermal experiments were conducted to measure the effects of K availability,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Na&lt;/i&gt;/&lt;i&gt;K&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;ratio and ionic strength in chloride solutions on the rate and extent of the reaction of smectite to interstratified illite/smectite. The &amp;lt; 2 μm fraction of a bentonite was treated hydrothermally at temperatures of 200, 250, 300, 350, 400 and 450°C for run times of up to 30 days in the presence of 0.33, 0.66 and 1.00 equivalents of K per O&lt;sub&gt;10&lt;/sub&gt;(OH)&lt;sub&gt;2&lt;/sub&gt;. The effect of K-content on reaction progress is dramatic at low (0.33 eq.) K concentrations, but diminishes above a concentration of 0.66 equivalents. The effect of K-content is also more important at lower temperatures than at higher temperatures. Addition of K above that required to satisfy the cation exchange capacity of the smectite reduced the amount of chlorite byproduct and produced authigenic K-feldspar at the highest K-concentration.&lt;/p&gt;&lt;p&gt;Similar experiments were run using&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Na&lt;/i&gt;/&lt;i&gt;K&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;equivalent ratios of 0 to 25 and total solution molalities of 0 to 3.75 molal. Because these experiments were small fixed-volume experiments, it was necessary to vary two of the three key variables (K-content,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Na&lt;/i&gt;/&lt;i&gt;K&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;ratio, ionic strength simultaneously. The data suggest, however, that K-content has a much stronger effect than either&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Na&lt;/i&gt;/&lt;i&gt;K&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;ratio or ionic strength on illitization reaction progress.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0169-1317(92)90032-I</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Dioctahedral smectite reactions at elevated temperatures: Effects of K-availability, Na/K ratio and ionic strength</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>