<?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>P.D. Proctor</dc:contributor>
  <dc:creator>J.N. Shrivastava</dc:creator>
  <dc:date>1962</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Gold, silver, copper, and lead-bearing veins, non-radially zoned, occur just beyond the southern and western margins of the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Searchlight&lt;/span&gt;&lt;span&gt;,&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Nevada&lt;/span&gt;&lt;span&gt;,&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;quartz&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;monzonite&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;stock&lt;/span&gt;&lt;span&gt;. Seven samples of the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;quartz&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;monzonite&lt;/span&gt;&lt;span&gt;&amp;nbsp;and purified individual constituent minerals of the rock, representing apophyses and marginal and interior parts of the intrusive mass, were analyzed petrographically and spectrographically. A semiquantitative total-energy spectrographic method proved satisfactory for Cu, Pb, Ni, Co, Ga, Mo, Mn, Ti, V, Cr, Sr, and Zr, but too insensitive for Zn, Ag, and Au. A synthetic silicate base was used for preparation of standards and working curves. The modal&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;trace&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;element&lt;/span&gt;&lt;span&gt;&amp;nbsp;content of unaltered (hypothetical)&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;quartz&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;monzonite&lt;/span&gt;&lt;span&gt;&amp;nbsp;samples was determined from the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;trace&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;element&lt;/span&gt;&lt;span&gt;&amp;nbsp;content of the purified minerals. Ferromagnesian minerals contain concentrations of Cu, Pb, Ni, Co, Mn, and Cr. Felsic minerals are low&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;these but high&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;Sr and Ga. Cu appears to have been partly released during chloritization of the mafic minerals. Ni, Cr, Zr show little difference between the unaltered (hypothetical) and actual rock. Ga, V, Mn, Sr are&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;lesser quantities&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;the altered rock. Pb and Cu also show a loss, especially nearest largest Pb and Cu producers. Pb, Cu, V occur&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;the spatially related veins, but Sr or Ga have not been reported to date. Pb/Cu&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;unaltered rock compared to altered rock is 1.6/1; past mining production ratio of Pb/Cu is 2.6/1. While further work is needed, the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;trace&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;element&lt;/span&gt;&lt;span&gt;&amp;nbsp;pattern suggests a possible means of identifying a "productive" intrusive body.&amp;nbsp;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.2113/gsecongeo.57.7.1062</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Society for Economic Geologist</dc:publisher>
  <dc:title>Trace element distribution in the searchlight, Nevada quartz monzonite stock</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>