<?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>I. S. E. Carmichael</dc:contributor>
  <dc:contributor>A. L. Smith</dc:contributor>
  <dc:creator>Zell E. Peterman</dc:creator>
  <dc:date>1970</dc:date>
  <dc:description>&lt;div class="article-section-wrapper js-article-section js-content-section  "&gt;&lt;p&gt;Quaternary lavas from Mount Lassen, Mount Shasta, and Medicine Lake, which range in composition from olivine basalt to rhyolite, have Sr&lt;sup&gt;87&lt;/sup&gt;/Sr&lt;sup&gt;86&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;values that fall between 0.7030 and 0.7043, corrected to 0.7080 for the Eimcr and Amend (MIT) SrCO&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;standard. These values are very close to average (corrected) strontium isotopic values of some other circum-Pacific volcanic suites and of lavas of oceanic islands. The low ratios suggest a mantle origin. The notably high strontium content (1400 ppm) in the andesites from Mount Shasta also indicates a mantle origin at depths where plagioclase is absent as a stable phase in the residual material.&lt;/p&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0016-7606(1970)81[311:SROQLO]2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Sr87/Sr86 ratios of Quaternary lavas of the Cascade Range, northern California</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>