<?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>W.E. Dean</dc:contributor>
  <dc:contributor>J. H. Bullock</dc:contributor>
  <dc:creator>W.F. Cannon</dc:creator>
  <dc:date>2003</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Sediments&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;&lt;/span&gt;Elk&lt;span&gt;&amp;nbsp;&lt;/span&gt;Lake&lt;span&gt;,&amp;nbsp;&lt;/span&gt;Minnesota&lt;span&gt;, consist of 10,400 varve layers that provide a precise chronology for&amp;nbsp;&lt;/span&gt;Holocene&lt;span&gt;&amp;nbsp;fluctuations&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;&lt;/span&gt;climate&lt;span&gt;&amp;nbsp;and biota recorded&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;the strata. Progressively greater concentrations and accumulation rates of&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;since ca. A.D. 1875 reflect&amp;nbsp;&lt;/span&gt;deposition&lt;span&gt;&amp;nbsp;of anthropogenic&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;additions to the atmosphere. Within the&amp;nbsp;&lt;/span&gt;Holocene&lt;span&gt;&amp;nbsp;record are numerous short intervals&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;which&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;concentrations and accumulation rates exceed the modern values. The highest&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;concentrations formed ca. 8 ka, coincident with a rapid&amp;nbsp;&lt;/span&gt;change&lt;span&gt;&amp;nbsp;from cool, moist conditions to warm, dry conditions. A related&amp;nbsp;&lt;/span&gt;change&lt;span&gt;&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;flora from pine forest to prairie caused destruction of organic forest soils and the release of&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;that had been sequestered&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;them, resulting&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;a short- lived pulse of&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;to the&amp;nbsp;&lt;/span&gt;lake&lt;span&gt;. Accumulation rates of&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;were highest during the 4 k.y. mid-&lt;/span&gt;Holocene&lt;span&gt;&amp;nbsp;dry interval and show a correlation with periods of rapid&amp;nbsp;&lt;/span&gt;deposition&lt;span&gt;&amp;nbsp;of eolian dust. The&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;&amp;nbsp;was probably bound to wind-borne mineral particles, which were derived from an unidentified&amp;nbsp;&lt;/span&gt;mercury&lt;span&gt;-rich source region west of&amp;nbsp;&lt;/span&gt;Elk&lt;span&gt;&amp;nbsp;&lt;/span&gt;Lake&lt;span&gt;.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0091-7613(2003)031&lt;0187:EOHCCO&gt;2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Effects of Holocene climate change on mercury deposition in Elk Lake, Minnesota: The importance of eolain transport in the mercury cycle</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>