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Dunedin Volcano - Wikipedia

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.latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Dunedin_Volcano&amp;params=45.848_S_170.636_E_type:landmark_globe:earth_region:NZ"><span class="geo-nondefault"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">45°50′53″S</span> <span class="longitude">170°38′10″E</span></span></span><span class="geo-multi-punct">&#xfeff; / &#xfeff;</span><span class="geo-default"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">45.848°S 170.636°E</span><span style="display:none">&#xfeff; / <span class="geo">-45.848; 170.636</span></span></span></a></span></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Extinct volcano in New Zealand</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vcard" style="width:24.5em;"><tbody><tr><th colspan="2" class="infobox-above fn org" style="border-style:solid; border-width: 2px 33px; border-color:rgb(255,255,0)">Dunedin Volcano</th></tr><tr><td colspan="2" class="infobox-subheader"><a href="/wiki/Geochronology" title="Geochronology">Stratigraphic range</a>: <span class="noprint"><span style="display:inline-block;"><a href="/wiki/Miocene" title="Miocene">Miocene</a> (</span><span style="display:inline-block;">16–10&#160;<a href="/wiki/Megaannum" class="mw-redirect" title="Megaannum">Ma</a></span> <span style="display:inline-block;">)</span><div id="Timeline-row" style="margin: 4px auto 0; clear:both; width:220px; padding:0px; height:18px; overflow:visible; white-space:nowrap; border:1px #666; border-style:solid none; position:relative; z-index:0; font-size:97%;"> <div style="position:absolute; height:100%; left:0px; width:207.23076923077px; padding-left:5px; text-align:left; background-color:rgb(254,217,106); background-image: linear-gradient(to right, rgba(255,255,255,1), rgba(254,217,106,1) 15%, rgba(254,217,106,1));"><a href="/wiki/Precambrian" title="Precambrian">PreꞒ</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(127,160,86); left:37.636923076923px; width:18.073846153846px;"><a href="/wiki/Cambrian" title="Cambrian">Ꞓ</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(0,146,112); left:55.710769230769px; width:14.08px;"><a href="/wiki/Ordovician" title="Ordovician">O</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(179,225,182); left:69.790769230769px; width:8.3261538461539px;"><a href="/wiki/Silurian" title="Silurian">S</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(203,140,55); left:78.116923076923px; width:20.409230769231px;"><a href="/wiki/Devonian" title="Devonian">D</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(103,165,153); left:98.526153846154px; width:20.307692307692px;"><a href="/wiki/Carboniferous" title="Carboniferous">C</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(240,64,40); left:118.83384615385px; width:15.907015384615px;"><a href="/wiki/Permian" title="Permian">P</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(129,43,146); left:134.74086153846px; width:17.092984615385px;"><a href="/wiki/Triassic" title="Triassic">T</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(52,178,201); left:151.83384615385px; width:19.089230769231px;"><a href="/wiki/Jurassic" title="Jurassic">J</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(127,198,78); left:170.92307692308px; width:26.738461538462px;"><a href="/wiki/Cretaceous" title="Cretaceous">K</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(253,154,82); left:197.66153846154px; width:14.543692307692px;"><a href="/wiki/Paleogene" title="Paleogene">Pg</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(255,230,25); left:212.20523076923px; width:6.9215384615385px;"><a href="/wiki/Neogene" title="Neogene">N</a></div> <div id="end-border" style="position:absolute; height:100%; background-color:#666; width:1px; left:219px"></div><div style="margin:0 auto; line-height:0; clear:both; width:220px; padding:0px; height:8px; overflow:visible; background-color:transparent; position:relative; top:-4px; z-index:100;"><div style="position:absolute; height:8px; left:214.58461538462px; width:2.0307692307692px; background-color:#360; opacity:0.42;"></div> <div style="position:absolute; height:8px; left:214.58461538462px; width:2.0307692307692px; background-color:#360; opacity:1;"></div> <div style="position:absolute; height:6px; top:1px; left:215.58461538462px; width:0.030769230769231px; background-color:#6c3;"></div> </div> </div></span></td></tr><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Organ_pipes_columnar_joints_Dunedin.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Organ_pipes_columnar_joints_Dunedin.jpg/240px-Organ_pipes_columnar_joints_Dunedin.jpg" decoding="async" width="240" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Organ_pipes_columnar_joints_Dunedin.jpg/360px-Organ_pipes_columnar_joints_Dunedin.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/27/Organ_pipes_columnar_joints_Dunedin.jpg/480px-Organ_pipes_columnar_joints_Dunedin.jpg 2x" data-file-width="1024" data-file-height="768" /></a></span><div class="infobox-caption">Basaltic columnar crystals in the "Organ pipes" formation</div></td></tr><tr><th scope="row" class="infobox-label">Type</th><td class="infobox-data">Igneous</td></tr><tr><th scope="row" class="infobox-label">Overlies</th><td class="infobox-data">Waipuna Bay Formation</td></tr><tr><th colspan="2" class="infobox-header" style="border-style:solid; border-width: 2px 33px; border-color:rgb(255,255,0)">Lithology</th></tr><tr><th scope="row" class="infobox-label">Primary</th><td class="infobox-data"><a href="/wiki/Basalt" title="Basalt">Basalt</a>, <a href="/wiki/Trachyte" title="Trachyte">trachyte</a>, <a href="/wiki/Phonolite" title="Phonolite">phonolite</a> and <a href="/wiki/Breccia" title="Breccia">breccia</a></td></tr><tr><th colspan="2" class="infobox-header" style="border-style:solid; border-width: 2px 33px; border-color:rgb(255,255,0)">Location</th></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Geographic_coordinate_system" title="Geographic coordinate system">Coordinates</a></th><td class="infobox-data"><span class="geo-inline"><style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Dunedin_Volcano&amp;params=45.848_S_170.636_E_type:landmark_globe:earth_region:NZ"><span class="geo-nondefault"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">45°50′53″S</span> <span class="longitude">170°38′10″E</span></span></span><span class="geo-multi-punct">&#xfeff; / &#xfeff;</span><span class="geo-default"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">45.848°S 170.636°E</span><span style="display:none">&#xfeff; / <span class="geo">-45.848; 170.636</span></span></span></a></span></span></td></tr><tr><th scope="row" class="infobox-label">Region</th><td class="infobox-data">Otago</td></tr><tr><th scope="row" class="infobox-label">Country</th><td class="infobox-data">New Zealand</td></tr><tr><th colspan="2" class="infobox-header" style="border-style:solid; border-width: 2px 33px; border-color:rgb(255,255,0)">Type section</th></tr><tr><th scope="row" class="infobox-label">Named for</th><td class="infobox-data"><a href="/wiki/Dunedin" title="Dunedin">Dunedin</a></td></tr><tr><td colspan="2" class="infobox-below" style="border-style:solid; border-width: 2px; border-color:rgb(255,255,0)"><div class="mw-kartographer-container thumb tnone center"><div class="thumbinner" style="width: 300px;"><a class="mw-kartographer-map notheme" style="width: 300px; height: 300px;" data-mw-kartographer="mapframe" data-style="osm-intl" data-width="300" data-height="300" data-zoom="10" data-lat="-45.825" data-lon="170.56" data-overlays="[&quot;_8b3a2758be28c9c03543d271de1f22241a8d9c1e&quot;]" href="/wiki/Special:Map/10/-45.825/170.56/en"><img src="https://maps.wikimedia.org/img/osm-intl,10,-45.825,170.56,300x300.png?lang=en&amp;domain=en.wikipedia.org&amp;title=Dunedin_Volcano&amp;revid=1246863568&amp;groups=_8b3a2758be28c9c03543d271de1f22241a8d9c1e" width="300" height="300" decoding="async" srcset="https://maps.wikimedia.org/img/osm-intl,10,-45.825,170.56,300x300@2x.png?lang=en&amp;domain=en.wikipedia.org&amp;title=Dunedin_Volcano&amp;revid=1246863568&amp;groups=_8b3a2758be28c9c03543d271de1f22241a8d9c1e 2x" alt="Map" /></a><div class="thumbcaption">Map of selected surface volcanic features of the <a href="/wiki/South_Island" title="South Island">South Island</a> centred on the <a href="/wiki/Otago_Peninsula" title="Otago Peninsula">Otago Peninsula</a>. Clicking on the map enlarges it, and enables panning and mouseover of volcano name/wikilink and ages before present. Key for the <a href="/wiki/Igneous_rock" title="Igneous rock">volcanics</a> that are shown with panning is: <style data-mw-deduplicate="TemplateStyles:r981673959">.mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}</style><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#cc6600; color:black;">&#160;</span>&#160;<a href="/wiki/Basalt" title="Basalt">basalt</a></span> (shades of brown/orange), <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#aa4400; color:white;">&#160;</span>&#160;<a href="/wiki/Monogenetic_volcanic_field" title="Monogenetic volcanic field">monogenetic</a> basalts</span>, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#efaf00; color:black;">&#160;</span>&#160;undifferentiated basalts</span>, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#ff6600; color:black;">&#160;</span>&#160;arc basalts</span>, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#ff4400; color:black;">&#160;</span>&#160;arc ring basalts</span>, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#808000; color:black;">&#160;</span>&#160;<a href="/wiki/Olivine" title="Olivine">olivine</a></span> (basalts shades of olive), <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#ffaa77; color:black;">&#160;</span>&#160;<a href="/wiki/Phonolite" title="Phonolite">phonolite</a></span> (pale salmon), <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#bb00bb; color:white;">&#160;</span>&#160;<a href="/wiki/Dacite" title="Dacite">dacite</a></span>, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#ff0000; color:black;">&#160;</span>&#160;<a href="/wiki/Andesite" title="Andesite">andesite</a></span> (shades of red), <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#ff2200; color:black;">&#160;</span>&#160;basaltic andesite</span>, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#ff00ff; color:black;">&#160;</span>&#160;<a href="/wiki/Rhyolite" title="Rhyolite">rhyolite</a></span>, (<a href="/wiki/Ignimbrite" title="Ignimbrite">ignimbrite</a> is lighter shades of violet), and <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="background-color:#aaaaaa; color:black;">&#160;</span>&#160;plutonic or intusive</span> (gray) - so dolerite/<a href="/wiki/Diabase" title="Diabase">diabase</a>/microgabbro will have shadings towards gray compared to erupted basalt.</div></div></div></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Dunedin_volcanic_group" title="Dunedin volcanic group">Dunedin volcanic group</a></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Lighthouse_above_cliffs_at_Taiaroa_Head.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Lighthouse_above_cliffs_at_Taiaroa_Head.jpg/150px-Lighthouse_above_cliffs_at_Taiaroa_Head.jpg" decoding="async" width="150" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Lighthouse_above_cliffs_at_Taiaroa_Head.jpg/225px-Lighthouse_above_cliffs_at_Taiaroa_Head.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Lighthouse_above_cliffs_at_Taiaroa_Head.jpg/300px-Lighthouse_above_cliffs_at_Taiaroa_Head.jpg 2x" data-file-width="3264" data-file-height="4896" /></a><figcaption>A layer of scoria covered by a basalt lava flow at Taiaroa Head</figcaption></figure> <p>The <b>Dunedin Volcano</b> is an extensively eroded multi-vent <a href="/wiki/Shield_volcano" title="Shield volcano">shield volcano</a> that was active between 16 and 10 million years ago.<sup id="cite_ref-McDougallCoombs1973_1-0" class="reference"><a href="#cite_note-McDougallCoombs1973-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> It originally extended from the modern city of <a href="/wiki/Dunedin" title="Dunedin">Dunedin</a>, <a href="/wiki/New_Zealand" title="New Zealand">New Zealand</a> to <a href="/wiki/Aramoana" title="Aramoana">Aramoana</a> about 25&#160;km away. Extensive erosion has occurred over the last 10 million years and <a href="/wiki/Otago_Harbour" title="Otago Harbour">Otago Harbour</a> now fills the oldest parts of the volcano.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-VFSDV_3-0" class="reference"><a href="#cite_note-VFSDV-3"><span class="cite-bracket">&#91;</span>3<span class="cite-bracket">&#93;</span></a></sup> The remnants of the volcano form the hills around <a href="/wiki/Otago_Harbour" title="Otago Harbour">Otago Harbour</a> (including <a href="/wiki/Mount_Cargill" title="Mount Cargill">Mount Cargill</a>, <a href="/wiki/Flagstaff_(Otago)" title="Flagstaff (Otago)">Flagstaff</a>, <a href="/wiki/Saddle_Hill_(New_Zealand)" title="Saddle Hill (New Zealand)">Saddle Hill</a>, <a href="/wiki/Signal_Hill_(New_Zealand)" title="Signal Hill (New Zealand)">Signal Hill</a>, and <a href="/wiki/Otago_Peninsula" title="Otago Peninsula">Otago Peninsula</a>). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Geology">Geology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dunedin_Volcano&amp;action=edit&amp;section=1" title="Edit section: Geology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Volcanism began in a shallow marine environment. The volcano became larger with flows of basalt and minor <a href="/wiki/Trachyte" title="Trachyte">trachyte</a> creating the bulk of the volcano. The total volume of eruptives has been estimated to be 150&#160;km<sup>3</sup> (36&#160;cu&#160;mi) but there was a much larger intrusive component at 600&#160;km<sup>3</sup> (140&#160;cu&#160;mi).<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> The final phase of eruptions are preserved as phonolite domes around <a href="/wiki/Mount_Cargill" title="Mount Cargill">Mount Cargill</a>.<sup id="cite_ref-Coombs2008_5-0" class="reference"><a href="#cite_note-Coombs2008-5"><span class="cite-bracket">&#91;</span>5<span class="cite-bracket">&#93;</span></a></sup> </p><p>Traces of the old Dunedin Volcano are best seen in the <a href="/wiki/Dunedin_Botanic_Garden" title="Dunedin Botanic Garden">Dunedin Botanic Garden's</a> geology walk,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">&#91;</span>6<span class="cite-bracket">&#93;</span></a></sup> the cliffs at <a href="/wiki/Aramoana" title="Aramoana">Aramoana</a> and the geomorphology of Mount Cargill which has preserved lava domes. Basaltic columns are also to be found as prominent features above <a href="/wiki/Second_Beach_(New_Zealand)" class="mw-redirect" title="Second Beach (New Zealand)">Second Beach</a> at <a href="/wiki/St_Clair,_New_Zealand" title="St Clair, New Zealand">St Clair</a> and at <a href="/wiki/Blackhead_(New_Zealand)" title="Blackhead (New Zealand)">Blackhead</a>. </p><p>This '<a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=6n5wNAShgvI">Dunedin Volcano Animation</a>' shows various locations around Dunedin with information on age of the rocks and general evolution of the Dunedin Volcano and more distant volcanism. </p> <div class="mw-heading mw-heading3"><h3 id="Origin_and_relationship_to_other_volcanoes">Origin and relationship to other volcanoes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dunedin_Volcano&amp;action=edit&amp;section=2" title="Edit section: Origin and relationship to other volcanoes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>New Zealand's South Island has many extinct volcanic centres with no yet fully agreed <a href="/wiki/Volcanic_arc" title="Volcanic arc">tectonic mechanism</a> of formation and the Dunedin volcano is one of them. They extend in age from the <a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a> to the <a href="/wiki/Pliocene" title="Pliocene">Pliocene</a> and outcrop throughout <a href="/wiki/Otago" title="Otago">Otago</a>, <a href="/wiki/Canterbury,_New_Zealand" class="mw-redirect" title="Canterbury, New Zealand">Canterbury</a> and on the <a href="/wiki/Chatham_Islands" title="Chatham Islands">Chatham Islands</a>. The largest single eruptive centre is the <a href="/wiki/Banks_Peninsula_Volcano" title="Banks Peninsula Volcano">Banks Peninsula Volcano</a> followed by the Dunedin Volcano, which is half its size, but is part of a much larger volcanic area, the <a href="/wiki/Dunedin_volcanic_group" title="Dunedin volcanic group">Dunedin volcanic group</a>.<sup id="cite_ref-Scott2020_7-0" class="reference"><a href="#cite_note-Scott2020-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup> The relationship in terms of age and magma melts within the Dunedin volcanic group has caused some revision of previous models as part of a larger synthesis that remains incomplete as it requires reanalysis and new analysis of many volcanics, as well as better information from off land studies. A model consistent with current evidence is that there has been intermittent melting of a middle <a href="/wiki/Lithosphere" title="Lithosphere">lithospheric</a> <a href="/wiki/Mantle_(geology)" title="Mantle (geology)">mantle</a> with <a href="/wiki/Metasomatism" title="Metasomatism">metasomatism</a> by hydrous <a href="/wiki/Asthenosphere" title="Asthenosphere">asthenosphere</a>-derived melts<sup id="cite_ref-Scott2020_7-1" class="reference"><a href="#cite_note-Scott2020-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup> </p><p>These volcanic centres can be dormant for tens of millions of years between eruptions. This implies that the mechanism of formation may be connected to the <a href="/wiki/Lithosphere" title="Lithosphere">lithosphere</a> unlike some other intraplate volcanoes such as the <a href="/wiki/Hawaiian_Islands" title="Hawaiian Islands">Hawaii island chain</a>, which are rooted in the <a href="/wiki/Asthenosphere" title="Asthenosphere">asthenosphere</a>. One possible mechanism for the creation of these volcanoes is the flaking off of the base of <a href="/wiki/Zealandia" title="Zealandia">Zealandia's</a> lower lithosphere into the asthenosphere. Zealandia has a thin lithosphere as it has been extended while <a href="/wiki/Natural_history_of_New_Zealand" title="Natural history of New Zealand">rafting away from Australia</a>. If large sections of this already thin lithosphere sank into the asthenosphere, it would be replaced with hotter rock leading to <a href="/wiki/Decompression_melting" class="mw-redirect" title="Decompression melting">decompression melting</a>. This theoretically could cause volcanic activity that is locked to the moving lithosphere over many millions of years.<sup id="cite_ref-Hoernle_2006_8-0" class="reference"><a href="#cite_note-Hoernle_2006-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Risk_potential">Risk potential</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dunedin_Volcano&amp;action=edit&amp;section=3" title="Edit section: Risk potential"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Dunedin Volcano has the distinction amongst the <a href="/wiki/South_Island_surface_volcanism" title="South Island surface volcanism">South Island volcanics</a> of having a potential magma melt pool still underneath it, as backed up by heat flow<sup id="cite_ref-Godfrey2001_9-0" class="reference"><a href="#cite_note-Godfrey2001-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> and surface helium measurements.<sup id="cite_ref-Hoke2000_10-0" class="reference"><a href="#cite_note-Hoke2000-10"><span class="cite-bracket">&#91;</span>10<span class="cite-bracket">&#93;</span></a></sup> Accordingly there may now be a gradually re-accumulating 10 million year melt which could, with a low risk of it happening, in due course become manifest as active surface volcanism again.<sup id="cite_ref-Godfrey2001_9-1" class="reference"><a href="#cite_note-Godfrey2001-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> </p> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:Otago_Harbour_panorama.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/46/Otago_Harbour_panorama.jpg/500px-Otago_Harbour_panorama.jpg" decoding="async" width="500" height="110" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/46/Otago_Harbour_panorama.jpg/750px-Otago_Harbour_panorama.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/46/Otago_Harbour_panorama.jpg/1000px-Otago_Harbour_panorama.jpg 2x" data-file-width="4912" data-file-height="1080" /></a><figcaption>The Dunedin Volcano was originally centred on <a href="/wiki/Quarantine_Island/Kamau_Taurua" class="mw-redirect" title="Quarantine Island/Kamau Taurua">Quarantine Island</a> (centre of the image) and is now highly eroded. There is speculation that it may have been up to 1000m high.<sup id="cite_ref-VFSDV_3-1" class="reference"><a href="#cite_note-VFSDV-3"><span class="cite-bracket">&#91;</span>3<span class="cite-bracket">&#93;</span></a></sup> It is still close to the centre of the present magma hot spot underneath <a href="/wiki/Portobello,_New_Zealand" title="Portobello, New Zealand">Portobello</a>.<sup id="cite_ref-Godfrey2001_9-2" class="reference"><a href="#cite_note-Godfrey2001-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Scott2020_7-2" class="reference"><a href="#cite_note-Scott2020-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup></figcaption></figure><p>. </p><div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dunedin_Volcano&amp;action=edit&amp;section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Dunedin_volcanic_group" title="Dunedin volcanic group">Dunedin volcanic group</a></li> <li><a href="/wiki/Banks_Peninsula_Volcano" title="Banks Peninsula Volcano">Banks Peninsula Volcano</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dunedin_Volcano&amp;action=edit&amp;section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-McDougallCoombs1973-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-McDougallCoombs1973_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFMcDougallCoombs1973" class="citation journal cs1">McDougall, Ian; Coombs, D. S. 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title=\"Trachyte\"\u003Etrachytic\u003C/a\u003E lava (11.59 ± 0.08 Ma)"},"geometry":{"type":"Polygon","coordinates":[[[172.6250214,-43.7303342],[172.6275963,-43.7292798],[172.6305145,-43.7274812],[172.6317162,-43.7255584],[172.630772,-43.724628],[172.6282829,-43.7248761],[172.6263088,-43.7258065],[172.6245064,-43.7274812],[172.6233906,-43.7287216],[172.6239914,-43.729776],[172.6250214,-43.7303342]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#ff00ff","fill-opacity":1,"fill":"#ff00ff","title":"McQueens \u003Ca href=\"/wiki/Rhyolite\" title=\"Rhyolite\"\u003Erhyolite\u003C/a\u003E (98.0 ± 1.2 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title=\"Basalt\"\u003Ebasalt\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.7304846,-45.7890446],[170.7334029,-45.7891942],[170.7345187,-45.7889848],[170.735334,-45.7890147],[170.7352053,-45.7898226],[170.7342612,-45.7909897],[170.7346045,-45.791648],[170.7375656,-45.7918874],[170.7390677,-45.792037],[170.7400118,-45.7914984],[170.7397704,-45.791345],[170.7394646,-45.791057],[170.7396792,-45.7903314],[170.7400333,-45.789673],[170.7400976,-45.7886556],[170.7403981,-45.7879673],[170.7415675,-45.7879374],[170.7427262,-45.787668],[170.7433084,-45.7876866],[170.7448104,-45.787709],[170.7452235,-45.787795],[170.7456365,-45.7881055],[170.7461408,-45.7882776],[170.7471493,-45.7878811],[170.7475355,-45.7874247],[170.747042,-45.78729],[170.747042,-45.786901],[170.7467845,-45.7866017],[170.7462052,-45.7866092],[170.7453898,-45.7868673],[170.7449392,-45.786901],[170.7446012,-45.786916],[170.7442418,-45.7868262],[170.7440272,-45.7865344],[170.7442954,-45.786093],[170.7441023,-45.7858162],[170.7436732,-45.7856291],[170.7434594,-45.7853597],[170.743218,-45.7854868],[170.7429337,-45.7854644],[170.742982,-45.7850043],[170.7427942,-45.7845292],[170.7428801,-45.7841326],[170.7431805,-45.7839755],[170.7434487,-45.7831001],[170.7431161,-45.7829547],[170.7428372,-45.7829622],[170.742687,-45.7828051],[170.7424429,-45.7824908],[170.7421559,-45.7818923],[170.7416463,-45.7813386],[170.7378375,-45.7800217],[170.7339337,-45.7778866],[170.7321543,-45.7769937],[170.7309312,-45.7775848],[170.7302016,-45.7787895],[170.7293433,-45.7817077],[170.7286352,-45.7829647],[170.7265216,-45.7841169],[170.7264251,-45.7848651],[170.7281923,-45.7865208],[170.7304846,-45.7890446]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#aa6644","fill":"#aa6644","title":"Reids Beach \u003Ca href=\"/wiki/Trachyte\" title=\"Trachyte\"\u003Etrachyte\u003C/a\u003E (13.0 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Road \u003Ca href=\"/wiki/Trachyte\" title=\"Trachyte\"\u003Etrachyte\u003C/a\u003E (13.0 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Portobello \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E and \u003Ca href=\"/wiki/Breccia\" title=\"Breccia\"\u003Ebreccia\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.6773368,-45.8213361],[170.6872824,-45.8215829],[170.6886986,-45.8262707],[170.6912735,-45.826708],[170.6957367,-45.8276538],[170.6993577,-45.8293471],[170.7014149,-45.831786],[170.7031503,-45.8334175],[170.7038492,-45.8341061],[170.70445,-45.8352423],[170.7043213,-45.8361393],[170.7029909,-45.8364682],[170.7016176,-45.8364084],[170.7000297,-45.8355712],[170.6994289,-45.8364981],[170.698871,-45.8370961],[170.6974977,-45.8376343],[170.6951374,-45.8371858],[170.6944078,-45.8372456],[170.6931203,-45.8382622],[170.6921762,-45.838763],[170.6905454,-45.839047],[170.6889576,-45.8394133],[170.6881327,-45.8396599],[170.6875009,-45.8399813],[170.6849904,-45.8405643],[170.684631,-45.8409137],[170.6834776,-45.841308],[170.6806291,-45.8415229],[170.6784458,-45.8415434],[170.6767614,-45.8412258],[170.6759621,-45.8400168],[170.6762357,-45.8394058],[170.6773354,-45.8389237],[170.6787113,-45.837838],[170.6801088,-45.8363636],[170.6803341,-45.8347191],[170.6772315,-45.8304722],[170.6751688,-45.8285004],[170.6737714,-45.827351],[170.6732511,-45.8267192],[170.672897,-45.8254258],[170.671991,-45.8253341],[170.6767438,-45.8216481],[170.6773368,-45.8213361]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994444","fill":"#994444","title":"Peninsula Beach Road \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E, \u003Ca href=\"/wiki/Plagioclase\" title=\"Plagioclase\"\u003Eplagioclase\u003C/a\u003E basalt \u003Ca href=\"/wiki/Basanite\" title=\"Basanite\"\u003Ebasanite\u003C/a\u003E, kaiwekite and \u003Ca href=\"/wiki/Trachyandesite\" title=\"Trachyandesite\"\u003Etrachyandesite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.6150283,-45.8276373],[170.6152858,-45.8278915],[170.6155862,-45.8279064],[170.6160154,-45.8281158],[170.616702,-45.827884],[170.6180592,-45.8277121],[170.6183542,-45.8275401],[170.6185742,-45.8273383],[170.6188156,-45.8267439],[170.6187888,-45.8264635],[170.6188263,-45.8261869],[170.618821,-45.8258897],[170.6189014,-45.8256972],[170.6190138,-45.8255425],[170.6191368,-45.8255],[170.6194051,-45.8253205],[170.619861,-45.8250477],[170.6201829,-45.8246626],[170.6204887,-45.8243336],[170.6208427,-45.8241393],[170.6210466,-45.8240346],[170.6210305,-45.8237879],[170.6209661,-45.8231972],[170.6204887,-45.8221804],[170.6188702,-45.8210888],[170.6171011,-45.8216044],[170.6168007,-45.8217091],[170.6158995,-45.8222623],[170.6152343,-45.8228306],[170.6149768,-45.8232343],[170.6150412,-45.8238624],[170.6146016,-45.8246521],[170.6145587,-45.8249661],[170.614666,-45.8252502],[170.6147089,-45.8255642],[170.6146231,-45.8257586],[170.614666,-45.8260427],[170.6148913,-45.8263418],[170.6150951,-45.8267455],[170.6149878,-45.8274183],[170.6150283,-45.8276373]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#aa6644","fill":"#aa6644","title":"\u003Ca href=\"/wiki/Port_Chalmers\" title=\"Port Chalmers\"\u003EPort Chalmers\u003C/a\u003E \u003Ca href=\"/wiki/Trachyte\" title=\"Trachyte\"\u003Etrachyte\u003C/a\u003E (13.0 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title=\"Aramoana\"\u003EAramoana\u003C/a\u003E \u003Ca href=\"/wiki/Trachyte\" title=\"Trachyte\"\u003Etrachyte\u003C/a\u003E (13.1 Ma)"},"geometry":{"type":"Polygon","coordinates":[[[170.6771389,-45.7858925],[170.6807223,-45.7840071],[170.6826106,-45.7828399],[170.6848422,-45.7814333],[170.6866879,-45.7803357],[170.68819,-45.7791086],[170.690207,-45.7784202],[170.6940265,-45.778061],[170.6964297,-45.7778814],[170.6998877,-45.7772606],[170.6987397,-45.7769763],[170.6966905,-45.7767593],[170.696079,-45.7768042],[170.6944554,-45.7766292],[170.6921452,-45.7765291],[170.6907022,-45.7766301],[170.6886154,-45.7770603],[170.6864936,-45.778035],[170.6823761,-45.7807756],[170.6814641,-45.7817483],[170.6808043,-45.7822608],[170.6800801,-45.7829529],[170.6793291,-45.783529],[170.6783421,-45.7842847],[170.6776661,-45.7851975],[170.6771389,-45.7858925]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#ffaa77","fill":"#dd8877","title":"Aramoana \u003Ca href=\"/wiki/Trachybasalt\" title=\"Trachybasalt\"\u003Etrachybasalt\u003C/a\u003E \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Diabase\" title=\"Diabase\"\u003Edolerite\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E \u003Ca href=\"/wiki/Phonolite\" title=\"Phonolite\"\u003Ephonolite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.6840049,-45.7772235],[170.686773,-45.7762461],[170.6880229,-45.7761553],[170.6888758,-45.7757615],[170.6899112,-45.7753453],[170.6913274,-45.7752929],[170.6930225,-45.7753341],[170.6946694,-45.7751582],[170.6951039,-45.7750048],[170.6958496,-45.7750815],[170.697314,-45.7755399],[170.6989502,-45.7750347],[170.7016056,-45.7723632],[170.7014134,-45.7722485],[170.7012213,-45.7720589],[170.7007599,-45.7717296],[170.7002449,-45.7713405],[170.6997729,-45.7709813],[170.6990862,-45.7705023],[170.6982279,-45.7696641],[170.6969405,-45.7680476],[170.6964684,-45.7672992],[170.6963141,-45.7665629],[170.6959279,-45.7655749],[170.6954987,-45.7645271],[170.6955845,-45.7639284],[170.6955416,-45.762641],[170.6952841,-45.7621919],[170.6947262,-45.7617428],[170.6945116,-45.7614434],[170.6952841,-45.761174],[170.6960995,-45.7607847],[170.696039,-45.7600239],[170.695524,-45.7592455],[170.6948803,-45.7588263],[170.6937645,-45.7582874],[170.6935499,-45.7580179],[170.6939361,-45.7574789],[170.6940649,-45.75691],[170.6940649,-45.7566705],[170.6933353,-45.7569699],[170.6929491,-45.7575089],[170.6926916,-45.7576885],[170.692477,-45.7572693],[170.6922625,-45.7570598],[170.6920908,-45.7567603],[170.6923054,-45.7562813],[170.6921766,-45.7560417],[170.6916616,-45.7561615],[170.6912325,-45.7561016],[170.6908663,-45.7567164],[170.6905229,-45.7572254],[170.6908663,-45.7581536],[170.6905659,-45.7591417],[170.6903513,-45.7599501],[170.6896217,-45.7606687],[170.6880339,-45.761477],[170.6875618,-45.763004],[170.6847294,-45.7653691],[170.6842573,-45.7688417],[170.6822832,-45.768243],[170.6814678,-45.7695003],[170.6813314,-45.7704989],[170.679529,-45.7750488],[170.6783702,-45.7748692],[170.6773832,-45.7748991],[170.6778982,-45.7725643],[170.678499,-45.7711874],[170.6798161,-45.7664297],[170.6796015,-45.7644239],[170.678829,-45.7633161],[170.6777561,-45.7619689],[170.6780994,-45.7610408],[170.677842,-45.7605617],[170.6778212,-45.7602129],[170.6776924,-45.7597338],[170.6778212,-45.7592248],[170.6774778,-45.7589254],[170.6770487,-45.7590152],[170.6766195,-45.7589554],[170.6762333,-45.7585961],[170.6759329,-45.7582368],[170.6755037,-45.758117],[170.6746883,-45.758656],[170.6746883,-45.7590152],[170.6741304,-45.7597937],[170.6741304,-45.760632],[170.6737442,-45.7614704],[170.6734438,-45.7622488],[170.6727142,-45.762638],[170.6717638,-45.7650888],[170.671678,-45.7668851],[170.6711553,-45.7685271],[170.6706833,-45.7702633],[170.6689666,-45.7721791],[170.6681083,-45.7725683],[170.6666492,-45.7734663],[170.664718,-45.7747235],[170.6637739,-45.7746636],[170.6633447,-45.7741847],[170.6612341,-45.7737027],[170.6604617,-45.7738224],[170.6589596,-45.7738224],[170.658273,-45.7736428],[170.6586592,-45.7722659],[170.6600325,-45.7710685],[170.6621783,-45.7706793],[170.6635086,-45.7704698],[170.6641953,-45.7697214],[170.6666611,-45.7677918],[170.6677769,-45.7667141],[170.6674336,-45.7660854],[170.6670966,-45.7652545],[170.6660237,-45.7645959],[170.6660667,-45.7631588],[170.6662383,-45.7626499],[170.6658521,-45.7620211],[170.6660237,-45.7613026],[170.6660237,-45.7604942],[170.6657662,-45.7603445],[170.6649079,-45.7607337],[170.6642213,-45.7606439],[170.6639209,-45.7607936],[170.6635346,-45.7607038],[170.662848,-45.7603146],[170.6617322,-45.7602248],[170.6612172,-45.7603146],[170.6606593,-45.7605541],[170.6601014,-45.7605541],[170.6594577,-45.7609134],[170.6584864,-45.7613924],[170.6565123,-45.7622307],[170.655139,-45.763069],[170.6538944,-45.7638774],[170.653637,-45.7649551],[170.6529503,-45.7666616],[170.6522207,-45.7688469],[170.6511049,-45.7698947],[170.6494312,-45.770643],[170.6489163,-45.7702838],[170.6486159,-45.7696253],[170.6497317,-45.7677692],[170.6503325,-45.7662125],[170.6516868,-45.7643264],[170.6517297,-45.7632487],[170.6504423,-45.7626499],[170.6491977,-45.7624927],[170.6485432,-45.7635368],[170.647524,-45.7646707],[170.6460005,-45.7652021],[170.6446313,-45.7652717],[170.6437729,-45.7651445],[170.6433062,-45.7654626],[170.6412517,-45.7676068],[170.6402002,-45.7698146],[170.6395681,-45.7721259],[170.6404157,-45.7738396],[170.6405981,-45.7747301],[170.6400509,-45.7753063],[170.6386459,-45.7755717],[170.6382232,-45.7759848],[170.6378005,-45.7766],[170.6371353,-45.7769292],[170.6352148,-45.778553],[170.6337545,-45.7808156],[170.6326375,-45.7827788],[170.632215,-45.783151],[170.6312776,-45.784047],[170.6305292,-45.7844772],[170.6298909,-45.7852329],[170.6304381,-45.7859885],[170.6316504,-45.7862466],[170.6333134,-45.7871631],[170.6340966,-45.7880946],[170.6346008,-45.7886369],[170.6357044,-45.7889412],[170.6378394,-45.7885297],[170.6393411,-45.7875798],[170.6402635,-45.7868842],[170.6421619,-45.7858821],[170.6439965,-45.7858485],[170.64574,-45.7852799],[170.6463326,-45.7846991],[170.6472954,-45.78398],[170.6486741,-45.7834114],[170.6495324,-45.7833403],[170.6509512,-45.7841184],[170.6516459,-45.784384],[170.6527403,-45.784384],[170.6531359,-45.7840539],[170.6530165,-45.7837387],[170.6535771,-45.7831532],[170.6544381,-45.7828334],[170.6553206,-45.7825584],[170.6567421,-45.7825808],[170.6577613,-45.7824954],[170.6589414,-45.7824249],[170.6616397,-45.7815121],[170.6622835,-45.7808873],[170.6651642,-45.7809584],[170.6667359,-45.7812278],[170.6681478,-45.7812703],[170.6701068,-45.7813952],[170.671303,-45.7811146],[170.6718958,-45.7809182],[170.6728963,-45.7806619],[170.6734401,-45.7807052],[170.6743594,-45.7808608],[170.6756401,-45.78094],[170.6772655,-45.7808241],[170.6789231,-45.7806071],[170.6803286,-45.7799262],[170.6805727,-45.7794754],[170.6808812,-45.7790395],[170.6828648,-45.7780365],[170.6831807,-45.7778202],[170.683552,-45.7775491],[170.6840049,-45.7772235]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994444","fill":"#994444","title":"Mapel Creek \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E, \u003Ca href=\"/wiki/Plagioclase\" title=\"Plagioclase\"\u003Eplagioclase\u003C/a\u003E basalt \u003Ca href=\"/wiki/Basanite\" title=\"Basanite\"\u003Ebasanite\u003C/a\u003E, kaiwekite and \u003Ca href=\"/wiki/Trachyandesite\" title=\"Trachyandesite\"\u003Etrachyandesite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.6517401,-45.7632622],[170.6520941,-45.7641828],[170.6524417,-45.7641977],[170.6538836,-45.7638534],[170.6536261,-45.7649761],[170.6529423,-45.7666958],[170.6522157,-45.7688645],[170.6510999,-45.7699047],[170.6494476,-45.7706232],[170.6489326,-45.7702714],[170.6486322,-45.7696203],[170.6497587,-45.767748],[170.6503488,-45.7662137],[170.6516867,-45.7643496],[170.6517401,-45.7632622]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994444","fill":"#994444","title":"\u003Ca href=\"/wiki/Whareakeake\" title=\"Whareakeake\"\u003EWhareakeake\u003C/a\u003E \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E, \u003Ca href=\"/wiki/Plagioclase\" title=\"Plagioclase\"\u003Eplagioclase\u003C/a\u003E basalt \u003Ca href=\"/wiki/Basanite\" title=\"Basanite\"\u003Ebasanite\u003C/a\u003E, kaiwekite and \u003Ca href=\"/wiki/Trachyandesite\" title=\"Trachyandesite\"\u003Etrachyandesite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.6660225,-45.7645983],[170.6660815,-45.7631463],[170.6662478,-45.7626598],[170.6666984,-45.7627608],[170.6680672,-45.7626823],[170.6694619,-45.7629518],[170.6706421,-45.7630715],[170.6712,-45.763341],[170.6716935,-45.7632661],[170.6721227,-45.7630715],[170.672702,-45.7626674],[170.6717579,-45.7650872],[170.6716653,-45.7668544],[170.6706568,-45.7702821],[170.6689449,-45.7721954],[170.6681402,-45.7725086],[170.6647392,-45.7747225],[170.6638165,-45.7746177],[170.6633659,-45.7741687],[170.6612276,-45.7736599],[170.6604551,-45.7737946],[170.6589101,-45.7738544],[170.6582879,-45.7736],[170.6586526,-45.7722717],[170.6600313,-45.7710706],[170.6616031,-45.7707769],[170.6635182,-45.7704756],[170.6641973,-45.7697126],[170.6666735,-45.7677857],[170.6677743,-45.7667085],[170.6674368,-45.7660832],[170.6670994,-45.7652557],[170.6660225,-45.7645983]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994444","fill":"#994444","title":"Jennings Creek \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E, \u003Ca href=\"/wiki/Plagioclase\" title=\"Plagioclase\"\u003Eplagioclase\u003C/a\u003E basalt \u003Ca href=\"/wiki/Basanite\" title=\"Basanite\"\u003Ebasanite\u003C/a\u003E, kaiwekite and \u003Ca href=\"/wiki/Trachyandesite\" title=\"Trachyandesite\"\u003Etrachyandesite\u003C/a\u003E (11.8 Ma)"},"geometry":{"type":"Polygon","coordinates":[[[170.6781032,-45.7609603],[170.6777814,-45.7619034],[170.6795946,-45.7643659],[170.6797769,-45.7663492],[170.6784466,-45.7712512],[170.6778887,-45.772501],[170.6774166,-45.7749405],[170.6795624,-45.7749854],[170.6813434,-45.7705216],[170.6813219,-45.7695898],[170.6823089,-45.7682652],[170.6842831,-45.7688527],[170.6847122,-45.7653688],[170.6875446,-45.7630112],[170.6879738,-45.761589],[170.6856563,-45.7620531],[170.6832531,-45.7619184],[170.6781032,-45.7609603]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#ffaa77","fill":"#ffaa77","title":"Purakaunui School Road \u003Ca href=\"/wiki/Phonolite\" title=\"Phonolite\"\u003Ephonolite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.6275762,-45.7603239],[170.6277693,-45.7600582],[170.6285901,-45.7595791],[170.628515,-45.758999],[170.6286652,-45.7586547],[170.6290621,-45.758243],[170.6298775,-45.7578126],[170.6308646,-45.7574477],[170.6310792,-45.7572849],[170.6312615,-45.757064],[170.6313045,-45.7568432],[170.6316531,-45.7575656],[170.6316102,-45.7584227],[170.630768,-45.7604661],[170.6297541,-45.7624309],[170.6296093,-45.763505],[170.6297273,-45.7641898],[170.6294108,-45.7647811],[170.6293089,-45.7653013],[170.6289173,-45.7655221],[170.6285901,-45.7650692],[170.628354,-45.7646127],[170.6281287,-45.7628875],[170.6275762,-45.7603239]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#ffaa77","fill":"#dd8877","title":"Purakaunui Hill \u003Ca href=\"/wiki/Trachybasalt\" title=\"Trachybasalt\"\u003Etrachybasalt\u003C/a\u003E \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Diabase\" title=\"Diabase\"\u003Edolerite\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E \u003Ca href=\"/wiki/Phonolite\" title=\"Phonolite\"\u003Ephonolite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.627337,-45.7418003],[170.6279163,-45.7409916],[170.6284099,-45.7406397],[170.6287532,-45.7405423],[170.6299977,-45.7393143],[170.6303518,-45.7390373],[170.631017,-45.738925],[170.6314944,-45.7386853],[170.6319289,-45.7383559],[170.6324439,-45.7384457],[170.6325619,-45.7387078],[170.6329267,-45.7389774],[170.6334953,-45.7390448],[170.6341176,-45.7389849],[170.6349974,-45.7386329],[170.6357806,-45.7391496],[170.6366925,-45.7390672],[170.6366335,-45.7387378],[170.636832,-45.7387303],[170.6373684,-45.7389474],[170.638216,-45.7387453],[170.6384252,-45.7389062],[170.6385272,-45.7391122],[170.6378405,-45.7396812],[170.6377654,-45.7400032],[170.6381946,-45.7402054],[170.6381517,-45.7423207],[170.6377761,-45.7440989],[170.6381248,-45.7454204],[170.6375616,-45.7471087],[170.6369742,-45.7475411],[170.6361078,-45.7480782],[170.6354024,-45.7486678],[170.6347399,-45.7488531],[170.6336026,-45.7488606],[170.6327014,-45.7487633],[170.6323581,-45.7486135],[170.631886,-45.7485537],[170.6317573,-45.7484039],[170.6316714,-45.7478499],[170.6314354,-45.747528],[170.6310492,-45.7473183],[170.630384,-45.7473109],[170.6295686,-45.7469215],[170.628957,-45.7467344],[170.6286244,-45.7463825],[170.6280451,-45.7460231],[170.6276696,-45.7457236],[170.6274872,-45.7454092],[170.6275945,-45.7451845],[170.6274121,-45.7447653],[170.6274657,-45.744316],[170.6274228,-45.7424891],[170.627337,-45.7418003]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994477","fill":"#994477","title":"Osborne 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href=\"/wiki/Roseneath,_Otago\" title=\"Roseneath, Otago\"\u003ERoseneath\u003C/a\u003E \u003Ca href=\"/wiki/Trachyte\" title=\"Trachyte\"\u003Etrachyte\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.5873039,-45.8332282],[170.5878404,-45.8336319],[170.5876258,-45.8360127],[170.5883125,-45.836435],[170.5886558,-45.8365322],[170.5871108,-45.8367415],[170.5861238,-45.8365023],[170.5853513,-45.8344691],[170.5857375,-45.8330039],[170.5881193,-45.8304174],[170.5890361,-45.8294175],[170.5891434,-45.828027],[170.5903343,-45.8274223],[170.59189,-45.8268774],[170.5932101,-45.8265147],[170.5939723,-45.826421],[170.5959197,-45.8262602],[170.5992006,-45.8257147],[170.5942224,-45.827808],[170.593894,-45.8279623],[170.5936365,-45.8282464],[170.5934433,-45.8288445],[170.5928847,-45.830551],[170.5923912,-45.831164],[170.5917045,-45.8314929],[170.5907175,-45.8315527],[170.5892304,-45.8315985],[170.5880148,-45.8317409],[170.5870996,-45.8321525],[170.5871426,-45.8326011],[170.5870782,-45.832915],[170.5873039,-45.8332282]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#ffaa77","fill":"#ffaa77","title":"\u003Ca href=\"/wiki/North_East_Valley\" title=\"North East Valley\"\u003EMount Mera\u003C/a\u003E \u003Ca href=\"/wiki/Phonolite\" title=\"Phonolite\"\u003Ephonolite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.5257117,-45.8430055],[170.5282866,-45.8438725],[170.5290805,-45.8439772],[170.533136,-45.8452178],[170.5343059,-45.8463615],[170.5329755,-45.8477964],[170.5297568,-45.8469893],[170.5274823,-45.8466007],[170.5263379,-45.8461724],[170.5246642,-45.8454849],[170.5234197,-45.8452158],[170.5236342,-45.844319],[170.5246213,-45.8441396],[170.5254367,-45.8439303],[170.5254796,-45.8433025],[170.5257117,-45.8430055]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994444","fill":"#994444","title":"Lindsay Creek \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E, \u003Ca href=\"/wiki/Plagioclase\" title=\"Plagioclase\"\u003Eplagioclase\u003C/a\u003E basalt \u003Ca href=\"/wiki/Basanite\" title=\"Basanite\"\u003Ebasanite\u003C/a\u003E, kaiwekite and \u003Ca href=\"/wiki/Trachyandesite\" title=\"Trachyandesite\"\u003Etrachyandesite\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.5234229,-45.8452435],[170.5246674,-45.8454976],[170.5274355,-45.8465887],[170.5257296,-45.8481507],[170.5248659,-45.8493202],[170.524131,-45.8500115],[170.5237984,-45.8507545],[170.5229508,-45.8514377],[170.5225217,-45.8488072],[170.5225646,-45.848299],[170.5226504,-45.847193],[170.5229079,-45.8458328],[170.5234229,-45.8452435]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#994444","fill":"#994444","title":"Knox College \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E, \u003Ca href=\"/wiki/Plagioclase\" title=\"Plagioclase\"\u003Eplagioclase\u003C/a\u003E basalt \u003Ca href=\"/wiki/Basanite\" title=\"Basanite\"\u003Ebasanite\u003C/a\u003E, kaiwekite and \u003Ca href=\"/wiki/Trachyandesite\" title=\"Trachyandesite\"\u003Etrachyandesite\u003C/a\u003E (11.0 ± 0.2 Ma)"},"geometry":{"type":"Polygon","coordinates":[[[170.5340038,-45.8460485],[170.5393058,-45.8445262],[170.5458379,-45.8415248],[170.5472112,-45.8406279],[170.5477047,-45.8409268],[170.5470395,-45.8421246],[170.540967,-45.8484641],[170.5363154,-45.850135],[170.5303719,-45.8531203],[170.5279556,-45.8553897],[170.523844,-45.8575694],[170.5193138,-45.8589146],[170.5195015,-45.8577095],[170.5198234,-45.8569623],[170.5208718,-45.8554977],[170.5222021,-45.8543748],[170.5249907,-45.8522409],[170.5317731,-45.8483188],[170.5330392,-45.8477807],[170.5343266,-45.8463608],[170.5340038,-45.8460485]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#dd6600","fill":"#dd6600","title":"Waititi \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.5669285,-45.7480235],[170.5661131,-45.7485326],[170.5648256,-45.7486224],[170.5640531,-45.7480235],[170.5632377,-45.7466159],[170.5629802,-45.7448831],[170.5641819,-45.7424871],[170.5637098,-45.7415587],[170.5633236,-45.7397616],[170.5644186,-45.7390418],[170.5658348,-45.7388322],[170.5675085,-45.7396409],[170.5676801,-45.7400302],[170.567766,-45.7414679],[170.5685384,-45.7422466],[170.5685384,-45.7433847],[170.5685814,-45.7444329],[170.5670364,-45.7454811],[170.567251,-45.7462598],[170.5672939,-45.7473379],[170.5669285,-45.7480235]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke":"#dd6600","fill":"#dd6600","title":"SH1 \u003Ca href=\"/wiki/Basalt\" title=\"Basalt\"\u003Ebasalt\u003C/a\u003E"},"geometry":{"type":"Polygon","coordinates":[[[170.5575238,-45.7501787],[170.5592833,-45.7501188],[170.5606566,-45.7502985],[170.5616437,-45.7510172],[170.561987,-45.752215],[170.5606566,-45.7524545],[170.5591117,-45.7524845],[170.5568911,-45.7523048],[170.5558182,-45.752215],[170.5563332,-45.751077],[170.5568052,-45.7504781],[170.5575238,-45.7501787]]]}},{"type":"Feature","properties":{"stroke-width":1,"stroke-opacity":1,"stroke":"#dd6644","fill":"#dd8866","title":"Upper Waitati \u003Ca href=\"/wiki/Trachybasalt\" title=\"Trachybasalt\"\u003Etrachybasalt\u003C/a\u003E \u003Ca href=\"/wiki/Olivine\" title=\"Olivine\"\u003Eolivine\u003C/a\u003E \u003Ca href=\"/wiki/Diabase\" title=\"Diabase\"\u003Edolerite\u003C/a\u003E \u003Ca href=\"/wiki/Basalt\" 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