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<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>C. Schaeffer-Reiss</dc:contributor>
  <dc:contributor>J. W. De Leeuw</dc:contributor>
  <dc:contributor>M. D. Lewan</dc:contributor>
  <dc:contributor>J.R. Maxwell</dc:contributor>
  <dc:contributor>P. Schaeffer</dc:contributor>
  <dc:contributor>Damste J.S. Sinninghe</dc:contributor>
  <dc:creator>M.P. Koopmans</dc:creator>
  <dc:date>1997</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Sedimentary rock from the Gessoso-solfifera Formation (Messinian) in the Vena del Gesso Basin (northern Italy) containing immature (&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;o&lt;/sub&gt;&lt;span&gt;&amp;nbsp;= 0.25%) S-rich organic matter was artificially matured by hydrous pyrolysis at temperatures from 160 to 330°C for 72 h to study the diagenetic fate of&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;di- and tri-unsaturated methyl and ethyl ketones (alkenones) biosynthesised by several prymnesiophyte algae. During early diagenesis, the alkenones are incorporated into the kerogen by both sulphur and oxygen cross-linking as indicated by chemical degradation experiments with the kerogen of the unheated sample. Heating at temperatures between 160 and 260°C, which still represents early stages of thermal maturation, produces large amounts (up to 1 mg/g TOC) of S-bound, O-bound, and both S- and O-bound&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;skeletons, saturated&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C38 methyl, ethyl, and mid-chain ketones, C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;mid-chain 2,5-di-&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-alkylthiophenes, C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;1,2-di-&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-alkylbenzenes, and C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-alkanes. With increasing thermal maturation, three forms of the&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;skeletons are relatively stable (saturated hydrocarbons, 1,2-di-&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-alkylbenzenes and saturated ketones), whereas the S- and O-bound skeletons are relatively labile. These results suggest that in natural situations saturated ketones with an&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;37&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;n&lt;/i&gt;&lt;span&gt;-C&lt;/span&gt;&lt;sub&gt;38&lt;/sub&gt;&lt;span&gt;&amp;nbsp;skeleton can be expected as well as the corresponding hydrocarbons.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/S0016-7037(97)00099-9</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Sulphur and oxygen sequestration of n-C37 and n-C38 unsaturated ketones in an immature kerogen and the release of their carbon skeletons during early stages of thermal maturation</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>