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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>Jay M. Thompson</dc:contributor>
  <dc:contributor>Sarah E. Gilbert</dc:contributor>
  <dc:contributor>Amanda Souders</dc:contributor>
  <dc:creator>Stijm Glorie</dc:creator>
  <dc:date>2025</dc:date>
  <dc:description>&lt;p&gt;&lt;i&gt;In situ&lt;/i&gt;&lt;span&gt;&amp;nbsp;Re–Os geochronology by LA-ICP-MS/MS was previously demonstrated by reacting Os with CH&lt;/span&gt;&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;or N&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;O reaction gasses. However, for both reactions, a minor proportion of the Re parent isotope also reacts, potentially leading to significant isobaric interferences of&amp;nbsp;&lt;/span&gt;&lt;small&gt;&lt;sup&gt;187&lt;/sup&gt;&lt;/small&gt;&lt;span&gt;Re on&amp;nbsp;&lt;/span&gt;&lt;small&gt;&lt;sup&gt;187&lt;/sup&gt;&lt;/small&gt;&lt;span&gt;Os, especially for young samples with little radiogenic in-growth. Here we present an interlaboratory comparison and compare three reaction gas mixtures (CH&lt;/span&gt;&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;+ H&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;+ He, N&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;O and N&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;O + He) with the aim to robustly date Palaeogene (66–23 Ma) molybdenite from the Bingham Canyon and Henderson deposits. CH&lt;/span&gt;&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;mixed with H&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;gas gives the highest sensitivity, while N&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;O and He gas buffer Re reaction. On balance, the analytical method involving N&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;O + He reaction gas is most suitable for dating Palaeogene molybdenite, resulting in age precision of 2.6% for Bingham and 5.8% for Henderson. For older, &amp;gt;1 Ga molybdenite, CH&lt;/span&gt;&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;+ H&lt;/span&gt;&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;+ He may give comparatively better age precision.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1039/d5ja00030k</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Royal Society of Chemistry</dc:publisher>
  <dc:title>In situ Re-Os geochronology of Re-rich Palaeogene molybdenite by LA-ICP-MS/MS</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>