<?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>M.C. van Soest</dc:contributor>
  <dc:contributor>Robert H. Mariner</dc:contributor>
  <dc:contributor>S. Hurwitz</dc:contributor>
  <dc:contributor>S. E. Ingebritsen</dc:contributor>
  <dc:contributor>C.W. Wicks Jr.</dc:contributor>
  <dc:contributor>M.E. Schmidt</dc:contributor>
  <dc:creator>William C. Evans</dc:creator>
  <dc:date>2004</dc:date>
  <dc:description>&lt;p style="text-align: left;" data-mce-style="text-align: left;"&gt;&lt;span&gt;A geochemical investigation of springs near Three Sisters volcanoes was conducted in response to the detection of crustal uplift west of the peaks. Dilute, low-temperature springs near the center of uplift show &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 ≥7&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;A&lt;/sub&gt;&lt;span&gt; (&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;A&lt;/sub&gt;&lt;span&gt; is the ratio in air), and transport in total ∼16 MW of heat and ∼180 g/s of magmatic carbon (as CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;). These anomalous conditions clearly reflect the influence of magma, but they seemingly predate the onset of the present uplift and derive from a previous event. Episodes of intrusion may thus be more common in this area than the age of eruptive vents would imply.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/G19974.1</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>AGU Publications</dc:publisher>
  <dc:title>Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>