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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>D. L. Dettman</dc:contributor>
  <dc:contributor>K.C. Lohmann</dc:contributor>
  <dc:contributor>D. Brabec</dc:contributor>
  <dc:creator>Charles N. Alpers</dc:creator>
  <dc:date>1990</dc:date>
  <dc:description>&lt;p&gt;Stable isotope ratios of oxygen and carbon were determined for CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in soil gas in the vicinity of the massive sulfide deposit at Crandon, Wisconsin with the objective of determining the source of anomalously high CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;concentrations detected previously by McCarthy et al. (1986). Values of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C in soil gas CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;from depths between 0.5 and 1.0 m were found to range from −12.68‰ to −20.03‰ (PDB). Organic carbon from the uppermost meter of soil has&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C between −24.1 and −25.8‰ (PDB), indicating derivation from plant species with the C&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Calvin) type of photosynthetic pathway. Microbial decomposition of the organic carbon and root respiration from C&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and C&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Hatch-Slack) plants, together with atmospheric CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;are the likely sources of carbon in soil gas CO&lt;sub&gt;2&lt;/sub&gt;. Values of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O in soil-gas CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;range from 32 to 38‰ (SMOW). These&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O values are intermediate between that calculated for CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;gas in isotopic equilibrium with local groundwaters and that for atmospheric CO&lt;sub&gt;2&lt;/sub&gt;. The δ&lt;sup&gt;18&lt;/sup&gt;O data indicate that atmospheric CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;has been incorporated by mixing or diffusion. Any CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;generated by microbial oxidation of organic matter has equilibrated its oxygen isotopes with the local groundwaters.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0375-6742(90)90093-P</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Stable isotopes of carbon dioxide in soil gas over massive sulfide mineralization at Crandon, Wisconsin</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>