<?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>B.G. Aitken</dc:creator>
  <dc:date>1983</dc:date>
  <dc:description>&lt;p&gt;At a total pressure of 5 kb, calcic, Cl-free scapolite (Me&lt;sub&gt;83&lt;/sub&gt;) is stable relative to plagioclase-bearing assemblages at&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-1-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;T &amp;amp;#x2267; 625&amp;amp;#xB0;C&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;T ≧ 625°C&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-2-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;X&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;&lt;/mi&gt;&lt;mn&gt;&lt;mtext&gt;CO&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/mn&gt;&lt;/msub&gt;&lt;mtext&gt;&amp;amp;#x2267; 0.12&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;X&lt;sub&gt;CO2&lt;/sub&gt;≧ 0.12&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;. With decreasing temperature, scapolite breaks down to plagioclase + calcite. Scapolite is replaced by plagioclase + grossular + cancrinite + CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in the presence of H&lt;sub&gt;2&lt;/sub&gt;O-rich fluids. The stable coexistence of scapolite and calcite, an assemblage typical of most natural occurrences of calcic scapolite, is limited by the reaction: scapolite + calcite → grossular + cancrinite + CO&lt;sub&gt;2&lt;/sub&gt;, which occurs at 750°C,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;sub&gt;&lt;i&gt;CO&lt;/i&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 0.46; 700°C,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;sub&gt;&lt;i&gt;CO&lt;/i&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 0.33; 650°C,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;sub&gt;&lt;i&gt;CO&lt;/i&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 0.18, for the chosen bulk composition.&lt;/p&gt;&lt;p&gt;Generalization of the experimental results to encompass the complete range of fully carbonated scapolite compositions indicates that mizzonite (Me&lt;sub&gt;75&lt;/sub&gt;) has the largest&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;/i&gt;-&lt;i&gt;X&lt;/i&gt;&lt;sub&gt;&lt;i&gt;CO&lt;/i&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;stability field. For scapolite more calcic than mizzonite, stable growth is restricted to conditions of increasingly higher temperature and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;sub&gt;&lt;i&gt;CO&lt;/i&gt;2&lt;/sub&gt;.&lt;/p&gt;&lt;p&gt;The experimental results are consistent with various petrologic features of scapolite-bearing rocks, particularly scapolite-clinopyroxene granulites, and indicate that such rocks were formed in the presence of CO&lt;sub&gt;2&lt;/sub&gt;-rich fluids.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0016-7037(83)90258-2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>T-XCO2 stability relations and phase equilibria of a calcic carbonate scapolite</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>