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<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>O.L. Tweto</dc:creator>
  <dc:date>1960</dc:date>
  <dc:description>&lt;p&gt;&lt;span class="ScopusTermHighlight"&gt;Scheelite&lt;/span&gt;&lt;span&gt;&amp;nbsp;of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Precambrian&lt;/span&gt;&lt;span&gt;&amp;nbsp;age has been found at several localities&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Colorado&lt;/span&gt;&lt;span&gt;&amp;nbsp;and Wyoming&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;recent years. Most of it is disseminated&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;regionally metamorphosed rocks, principally&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;calc-silicate&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;gneiss&lt;/span&gt;&lt;span&gt;, but also&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;amphibolite. Small amounts are found&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;pegmatites and&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;gold-or copper-quartz veins of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Precambrian&lt;/span&gt;&lt;span&gt;&amp;nbsp;age. The&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;scheelite&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;most of the deposits contains molybdenum, and much of it is accompanied by discrete powellite (CaMoCX). The&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;scheelite&lt;/span&gt;&lt;span&gt;&amp;nbsp;deposits vary&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;age with the rocks that contain them and show no consistent genetic associations. Many of the deposits are products of some phase of the major plutonic stage that included regional metamorphism, migmatization, and emplacement of syntectonic granites, A few deposits may be related to younger&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Precambrian&lt;/span&gt;&lt;span&gt;&amp;nbsp;granites, and some are related to late diorite and pegmatite. Tungsten originally present&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;minor concentration&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;the sedimentary rocks that gave rise to the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;gneisses&lt;/span&gt;&lt;span&gt;&amp;nbsp;was evidently redistributed and r eery stall ized through successive&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Precambrian&lt;/span&gt;&lt;span&gt;&amp;nbsp;plutonic episodes. Reworked&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Precambrian&lt;/span&gt;&lt;span&gt;&amp;nbsp;deposits may have been a source of the tungsten&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;the economically important Tertiary deposits, and possibly also of molybdenum. The&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Precambrian&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;scheelite&lt;/span&gt;&lt;span&gt;&amp;nbsp;deposits found thus far have proved to be of minor economic importance, but others are still being found, and many more can be presumed to exist; among these may be some of importance.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.2113/gsecongeo.55.7.1406</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Society of Economic Geologists</dc:publisher>
  <dc:title>Scheelite in the precambrian gneisses of Colorado</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>