<?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>J. R. O’Neil</dc:contributor>
  <dc:creator>I. Barnes</dc:creator>
  <dc:date>1971</dc:date>
  <dc:description>&lt;div id="abstracts" class="Abstracts u-font-serif"&gt;&lt;div id="aep-abstract-id5" class="abstract author"&gt;&lt;div id="aep-abstract-sec-id6"&gt;&lt;p&gt;Two calcium-magnesium carbonate solid solutions form Holocene travertines and conglomerate cements in fresh water stream channels of the Coast Range of California. Calcite does not yield the {015} diffraction maximum. The {006} diffraction maximum is lacking over most of the range of composition of calcite. Calcite has compositions from CaCO&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;to Ca&lt;sub&gt;0.5&lt;/sub&gt;Mg&lt;sub&gt;0.5&lt;/sub&gt;CO&lt;sub&gt;3&lt;/sub&gt;. Dolomite yields both the {006} and {015} diffraction maxima over its entire composition range, Ca&lt;sub&gt;0.6&lt;/sub&gt;Mg&lt;sub&gt;0.4&lt;/sub&gt;CO&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;to Ca&lt;sub&gt;0.5&lt;/sub&gt;Mg&lt;sub&gt;0.5&lt;/sub&gt;CO&lt;sub&gt;3&lt;/sub&gt;. The Ca-Mg carbonates form in isotopic equilibrium and thermodynamic disequilibrium from dispersion of Ca&lt;sup&gt;2+&lt;/sup&gt;-rich water into CO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;2−&lt;/sup&gt;-rich water within the alluvium. The stable isotope data suggest that all the Mg-rich carbonates are primary precipitates and not a result of Mg-substitution in precursor CaCO&lt;sub&gt;3&lt;/sub&gt;. There is a correlation between&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;δC&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and Mg content of the carbonates which predicts a 5%. fractionation of C&lt;sup&gt;13&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;between dolomite and calcite at sedimentary temperatures. C&lt;sup&gt;14&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;is incorporated in Ca-Mg carbonates forming from C&lt;sup&gt;13&lt;/sup&gt;-poor meteoric waters and C&lt;sup&gt;13&lt;/sup&gt;-rich waters from Cretaceous sediments. C&lt;sup&gt;14&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;ages of the Ca-Mg carbonates are apparent, and cannot be corrected to absolute values. Solution rates of calcite decrease with increasing MgCO&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;content; dolomite dissolves slower than any calcite.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;ul id="issue-navigation" class="issue-navigation u-margin-s-bottom u-bg-grey1"&gt;&lt;/ul&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0016-7037(71)90068-8</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>English</dc:publisher>
  <dc:title>Calcium-magnesium carbonate solid solutions from Holocene conglomerate cements and travertines in the Coast Range of California</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>