<?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:contributor>William C. Evans</dc:contributor>
  <dc:contributor>Emily K. Montgomery-Brown</dc:contributor>
  <dc:contributor>Margaret T. Mangan</dc:contributor>
  <dc:contributor>John King</dc:contributor>
  <dc:contributor>Andrew G. Hunt</dc:contributor>
  <dc:creator>Jennifer L. Lewicki</dc:creator>
  <dc:date>2019</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Mammoth Mountain, California, has exhibited unrest over the past ~30 years, characterized by seismicity over a broad range of depths, elevated&amp;nbsp;&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;He/&lt;/span&gt;&lt;sup&gt;4&lt;/sup&gt;&lt;span&gt;He ratios in fumarolic gas, and large-scale diffuse CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emissions. This activity has been attributed to magmatic intrusion, but minimal ground deformation and the presence of a shallow crustal gas reservoir beneath Mammoth Mountain pose a challenge for estimating magma supply rate. Here, we use the record of fumarolic&amp;nbsp;&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;He/&lt;/span&gt;&lt;sup&gt;4&lt;/sup&gt;&lt;span&gt;He ratios and CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emissions to estimate that of the ~5.2 Mt of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;released from Mammoth Mountain between 1989 and 2016, 1.6 Mt was associated with active intrusion and degassing of ~0.05–0.07 km&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;&amp;nbsp;of basaltic magma. Intrusion at an average rate of ~0.002–0.003 km&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;/year into a postulated zone of partial melt at ~15-km depth could occur without detection by local Global Navigation Satellite System stations.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1029/2019GL082487</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Wiley</dc:publisher>
  <dc:title>Rate of magma supply beneath Mammoth Mountain, California based on helium isotopes and CO2 emissions</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>