<?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>C.M. Johnson</dc:contributor>
  <dc:contributor>W. Hildreth</dc:contributor>
  <dc:contributor>S.B. Shirey</dc:contributor>
  <dc:creator>G.L. Hart</dc:creator>
  <dc:date>2003</dc:date>
  <dc:description>New 187Os/188Os ratios of Quaternary Mount Adams volcanic rocks from the Cascade arc in southern Washington vary by &gt;300% (187Os/188Os = 0.165-0.564) and fall into high (&gt;0.319) and low (0.166 to 0.281) groups of 187Os/188Os ratios that are substantially more radiogenic than mantle values. These Os isotope compositions and groupings are interpreted to reflect recycling of discrete intracrustal domains with high 187Os/188Os ratios but differing ages, thus recording the process of crustal hybridization and homogenization. Os isotope compositions provide new constraints on amounts of intracrustal recycling in young subduction-zone environments that reflect the magmatic history of the arc. Sr, Nd, Hf, and Pb isotope variations in this young, mafic are complex are too small to allow such constraints.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0091-7613(2003)031&lt;0427:NOIEFI&gt;2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:title>New osmium isotope evidence for intracrustal recycling of crustal domains with discrete ages</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>