<?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>C.E. Barker</dc:creator>
  <dc:date>1983</dc:date>
  <dc:description>&lt;div id="15568224" class="article-section-wrapper js-article-section js-content-section  " data-section-parent-id="0"&gt;&lt;p&gt;Temperature (&lt;i&gt;T&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in °C) and mean vitrinite reflectance (&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in %) of sedimentary organic matter samples from six liquid-dominated geothermal systems plot about a line approximated by a regression equation of the form&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 0.435 exp 0.00683&lt;i&gt;T&lt;/i&gt;. The reflectance data from these systems are strongly temperature-dependent, with a coefficient of determination (&lt;i&gt;r&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;) of 0.8. Geologic evidence indicates that reaction duration ranges from 10&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;or 10&lt;sup&gt;4&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;to 10&lt;sup&gt;6&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;yr in these systems that appear to have near-maximum temperatures. The uncertainty in vitrinite reflectance and temperature determinations must account for a large part of the remaining variability not explained by the regression equation; therefore, the strong temperature dependence of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;m&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;indicates that after about 10&lt;sup&gt;4&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;yr, reaction duration has little or no influence on metamorphism of organic matter in liquid-dominated geothermal systems. These data indicate that vitrinite reflectance can be used to determine the maximum temperature reached in hot sedimentary basins of moderate longevity.&lt;/p&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0091-7613(1983)11&lt;384:IOTOMO&gt;2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Influence of time on metamorphism of sedimentary organic matter in liquid-dominated geothermal systems, western North America</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>