<?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>K. L. Tanaka</dc:contributor>
  <dc:creator>Sue Rotto</dc:creator>
  <dc:date>1995</dc:date>
  <dc:description>&lt;p&gt;&lt;span class="TextRun SCXW98055618 BCX8" lang="EN-US" xml:lang="EN-US" data-contrast="auto"&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Since the 1970’s, when the Mariner 9 spacecraft revealed the geologic diversity of Mars, the &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Chryse&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; Planitia region has been noted for its immense outflow channels and chaotic terrain (McCauley and others, 1972; Sharp and &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Malin&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, 1975; Baker, 1982, chap. 3; Mars Channel Working Group&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, 1983). Various proposals for the origin of these features have been offered; most workers have favored a mechanism in which ground water or water-rich debris was expelled from beneath a frozen crust, leading to catastrophic debris flows o&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;r floods that may have contained significant &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;amounts&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; of ice (Baker and Milton, 1974; &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Carr&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, 19&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;79; &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Nummedal&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; and Prior, 1981; &lt;/span&gt;&lt;span class="SpellingError SCXW98055618 BCX8"&gt;Lucchitta&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, 1982&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;; MacKinnon and Tanaka, 1989). The channels originated on or near the flanks of the &lt;/span&gt;&lt;span class="SpellingError SCXW98055618 BCX8"&gt;volcanotectonic&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; rises of &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Tharsis&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; (whose east margin is in the west&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; edge of the &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;map region) and Valles &lt;/span&gt;&lt;span class="SpellingError SCXW98055618 BCX8"&gt;Marineris&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, which suggests that tectonics and &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;igneous activity led&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; to the conditions for discharge. Estimated discharge rates for some channels exceed &lt;/span&gt;&lt;span class="SpellingError SCXW98055618 BCX8"&gt;thos&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; of prehistoric &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;floods on Earth (&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Carr&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, 1979; &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Komar&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;, 1979; Robinson and Tanaka, 1990)&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;. Some workers think that the discharges may have led to the development of temporary oceans that filled the northern lowlands (Parker and others, 1989; Baker and others, 1991). The &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Chryse&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; basin (&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Chryse&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; and southern &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;Acid&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;alia&lt;/span&gt; &lt;span class="SpellingError SCXW98055618 BCX8"&gt;Planitiae&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;), which is part of those lowlands, apparently has been the site of lava and sediment deposition (Greeley&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt; and others, 1977; Scot and &lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;T&lt;/span&gt;&lt;span class="NormalTextRun SCXW98055618 BCX8"&gt;anaka, 1986).&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/i2441</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Geologic/geomorphologic map of the Chryse Planitia region of Mars</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>