<?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>Paul C. Carpenter</dc:contributor>
  <dc:contributor>Jay M. Thompson</dc:contributor>
  <dc:contributor>Anthony Irving</dc:contributor>
  <dc:creator>Heather A. Lowers</dc:creator>
  <dc:date>2024</dc:date>
  <dc:description>&lt;p class="chapter-para"&gt;Angrite meteorites represent interesting sampling of planetary crustal environments. Quench-textured angrites with strong crystal zoning originated from the shallow surface region, with evidence of reducing conditions during solidification. Plutonic angrites have more coarse-grained igneous and metamorphic textures with comparatively less zoning and are interpreted as having equilibrated at greater depth. Plutonic angrites contain the minerals magnetite Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;comprised of Fe&lt;sup&gt;2+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and Fe&lt;sup&gt;3+&lt;/sup&gt;, and rhönite, where Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;is required by inspection of mineral stoichiometry. NWA 15507 is a plutonic angrite with a microgabbroic texture (mean grainsize ∼1.4 mm) composed of zoned Al-Ti-augite, Ca-bearing olivine, anorthite, with accessory kirschsteinite, rhönite, hercynite, low-Ni kamacite, merrillite, Ti-free magnetite and troilite [&lt;span id="jumplink-ozae044.008-B1" class="xrefLink"&gt;&lt;/span&gt;&lt;a class="link link-ref link-reveal xref-bibr" data-open="ozae044.008-B1" data-google-interstitial="false"&gt;1&lt;/a&gt;]. Rhönite analyzed by electron-probe microanalysis (EPMA) has the formula Ca&lt;sub&gt;2.04&lt;/sub&gt;(Mg&lt;sub&gt;0.32&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;&lt;sub&gt;4.25&lt;/sub&gt;Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;0.47&lt;/sub&gt;Ti&lt;sub&gt;0.33&lt;/sub&gt;Al&lt;sub&gt;0.61&lt;/sub&gt;)(Si&lt;sub&gt;3.74&lt;/sub&gt;Al&lt;sub&gt;2.26&lt;/sub&gt;)O&lt;sub&gt;20&lt;/sub&gt;, where Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;was estimated by stoichiometric analysis. During preliminary cathodoluminescence (CL) analysis, complex subgrain and oscillatory zoning was observed in the anorthite. In this study we use a combined approach of electron probe microanalysis (EPMA), cathodoluminescence (CL), electron-backscatter diffraction (EBSD), and laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) to further investigate the anorthite and distribution of Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in NWA 15507.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1093/mam/ozae044.008</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Oxford University Press</dc:publisher>
  <dc:title>Compositional and structural mapping of Northwest Africa 15507 angrite</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>