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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:contributor>Robert S. Coe</dc:contributor>
  <dc:contributor>Paul R. Renne</dc:contributor>
  <dc:contributor>Jonathan M. G. Glen</dc:contributor>
  <dc:creator>Nicholas A. Jarboe</dc:creator>
  <dc:date>2010</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The Columbia River Basalt Group (CRBG) eruptions have a well-defined relative magnetostratigraphy but have not been definitively correlated to the geomagnetic polarity time scale.&amp;nbsp;&lt;/span&gt;&lt;sup&gt;40&lt;/sup&gt;&lt;span&gt;Ar/&lt;/span&gt;&lt;sup&gt;39&lt;/sup&gt;&lt;span&gt;Ar ages are presented from lavas erupted in the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;through&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;N&lt;/i&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;span&gt;magnetozones of the CRBG and in the transition between&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;N&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;&lt;span&gt;. Four ages from transitionally magnetized lava flows at Steens Mountain, Catlow Peak, and Poker Jim Ridge with a weighted mean age 16.58&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;±&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;0.10&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;Ma&lt;/span&gt;&lt;a class="workspace-trigger" name="bfn1" href="http://www.sciencedirect.com/science/article/pii/S0009254110001221?via%3Dihub#fn1" data-mce-href="http://www.sciencedirect.com/science/article/pii/S0009254110001221?via%3Dihub#fn1"&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;/a&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and the more precise age 16.654&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;±&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;0.025&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;Ma of the normally magnetized Oregon Canyon tuff at the top of the Catlow Peak section show that the oldest CRBG magnetozone (&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;&lt;span&gt;) correlates with the C5Cr chron. Bayesian statistical analysis applied to data from four flows at Catlow Peak (using the mean age of the Steens reversal) gives a best and preferred age of the Steens reversal of 16.73&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;+&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;0.13/−0.08&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;Ma (95% confidence). Depending on the geomagnetic polarity time scale model, the eruption rate from&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;N&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;through&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(0.34–0.45&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;Ma in the middle and the bulk of the CRBG emplacement) averaged 0.30–0.41&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;km&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;/a and peaked at a rate 1 1/2 to 4 1/2 times higher during&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;2.&lt;/sub&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.chemgeo.2010.04.001</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>The age of the Steens reversal and the Columbia River Basalt Group</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>