<?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:creator>Frank S. Simons</dc:creator>
  <dc:date>1963</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;A&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;composite&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;dike&lt;/span&gt;&lt;span&gt;&amp;nbsp;of probable Tertiary age intrudes Precambrian granodiorite 6 miles north of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Klondyke&lt;/span&gt;&lt;span&gt;,&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Arizona&lt;/span&gt;&lt;span&gt;. The&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;dike&lt;/span&gt;&lt;span&gt;&amp;nbsp;is exposed discontinuously for about 1500 feet along the strike and has a core of porphyritic&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rhyolite&lt;/span&gt;&lt;span&gt;&amp;nbsp;15-20 feet thick flanked by coarsely porphyritic&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;andesite&lt;/span&gt;&lt;span&gt;&amp;nbsp;1-2 feet thick. Field evidence indicates that the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rhyolite&lt;/span&gt;&lt;span&gt;&amp;nbsp;is later than the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;andesite&lt;/span&gt;&lt;span&gt;&amp;nbsp;but that the core of the original&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;andesite&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;dike&lt;/span&gt;&lt;span&gt;&amp;nbsp;was still hot and unconsolidated&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;at&lt;/span&gt;&lt;span&gt;&amp;nbsp;the time of intrusion of the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rhyolite&lt;/span&gt;&lt;span&gt;. Chemically, the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rhyolite&lt;/span&gt;&lt;span&gt;&amp;nbsp;is nearly identical to a large alkali granite pluton of Tertiary age exposed 1 mile east. The&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;andesite&lt;/span&gt;&lt;span&gt;&amp;nbsp;component is similar both petrographically and chemically to lavas exposed in the region, but a direct relationship could not be established. Meager evidence suggests that the two&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;dike&lt;/span&gt;&lt;span&gt;&amp;nbsp;components were derived from separate magma bodies rather than being differentiates of a single magma.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0016-7606(1963)74[1049:CDOAAR]2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Composite dike of andesite and rhyolite at Klondyke, Arizona</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>