<?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>Ken Hon</dc:contributor>
  <dc:contributor>Karin E. Budding</dc:contributor>
  <dc:contributor>John F. Slack</dc:contributor>
  <dc:contributor>Lawrence W. Snee</dc:contributor>
  <dc:contributor>Ross A. Yeoman</dc:contributor>
  <dc:creator>Dana J. Bove</dc:creator>
  <dc:date>2001</dc:date>
  <dc:description>This paper presents 25 new 40Ar/39Ar dates from the main calc-alkaline ash-flow sheets and related younger plutons of the western San Juan volcanic field, the ash-flow sheets of the Lake City caldera cycle, and veins and other altered rocks in the Lake City region. The goal of the study was to produce similar quality 40Ar/39Ar ages to those currently published for the eastern and central San Juan Mountains. These new data provide a much more precise chronological framework for interpreting durations of events and their relationship to mineralization than do previously published conventional K-Ar dates for the western San Juan Mountains.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/pp1642</dc:identifier>
  <dc:language>en</dc:language>
  <dc:title>Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>