<?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>A.P. Pierce</dc:contributor>
  <dc:contributor>M.H. Delevaux</dc:contributor>
  <dc:creator>R.S. Cannon Jr.</dc:creator>
  <dc:date>1963</dc:date>
  <dc:description>A large crystal of lead sulfide from Picher, Oklahoma, has significant differences in isotopic composition of lead in successive growth zones. Lead isotope ratios in the parent ore-fluid evidently changed with time during crystal growth. The growth history of this crystal, interpreted quantitatively, points to a tentative hypothesis of genesis of Mississippi Valley deposits of lead and zinc.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1126/science.142.3592.574</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>American Association for the Advancement of Science</dc:publisher>
  <dc:title>Lead isotope variation with growth zoning in a galena crystal</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>