<?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:creator>J. L. Bischoff</dc:creator>
  <dc:date>1980</dc:date>
  <dc:description>&lt;p&gt;Pressure-volume-temperature relations for water at the depth of the magma chamber at 21&lt;span&gt;&amp;deg;&lt;/span&gt;N on the East Pacific Rise suggest that the maximum subsurface temperature of the geothermal fluid is about 420&lt;span&gt;&amp;deg;&lt;/span&gt;C. Both the chemistry of the discharging fluid and thermal balance considerations indicate that the effective water/rock ratios in the geothermal system are between 7 and 16. Such low ratios preclude effective metal transport at temperatures below 350&lt;span&gt;&amp;deg;&lt;/span&gt;C, but metal solubilization at 400&lt;span&gt;&amp;deg;&lt;/span&gt;C and above is effective even at such low ratios. It is proposed that the 420&lt;span&gt;&amp;deg;&lt;/span&gt;C fluid ascends essentially adiabatically and in the process expands, cools, and precipitates metal sulfides within the upper few hundred meters of the sea floor and on the sea floor itself.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1126/science.207.4438.1465</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>AAAS</dc:publisher>
  <dc:title>Geothermal system at 21°N, East Pacific Rise: physical limits on geothermal fluid and role of adiabatic expansion</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>