<?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>Gordon W. Day</dc:contributor>
  <dc:creator>John S. Klasner</dc:creator>
  <dc:date>1984</dc:date>
  <dc:description>&lt;p&gt;The Lusk Creek Roadless Area (Index map) lies along the western edge of the Illinois-Kentucky fluorspar district in which flourite deposits occur as lenticular-type veins emplaced along fult zones or as tratiform-shaped bedding-replacement deposits that occur along fault zones (Grogan and Bradbury, 1967; Trace, 1974). Although mineralogy varies between deposits, Trace (1974) points out that the principal minerals are fluorite (CaF) and calcite (CaCO&lt;sub&gt;3&lt;/sub&gt;), and associated with these minerals are lesser amounts of sphalerite (ZnS), galena (PbS), and barite (BaSO&lt;sub&gt;4&lt;/sub&gt;). Minor quantites of iron-rich dolomite (CaMg(CO&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;), pyrite (Fe&lt;span&gt;S&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;),&amp;nbsp;&amp;nbsp;and alteration products of zinc, lead, and copper minerals also are found.&amp;nbsp;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/mf1405B</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Geochemical survey of the Lusk Creek Roadless Area, Pope County, Illinois</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>