Bill Minarik<p><span class="h-card" translate="no"><a href="https://universeodon.com/@Anthro" class="u-url mention">@<span>Anthro</span></a></span> <span class="h-card" translate="no"><a href="https://sciencemastodon.com/@Ceedave" class="u-url mention">@<span>Ceedave</span></a></span> The 4.3 Ga age is from coupled Nd-Sm systems (short and long lived); the mafic rocks do not have zircons. The younger age is from zircons in cross-cutting felsic units. This is the work of Jonathan O'Neil (now at <a href="https://fosstodon.org/tags/uottawa" class="mention hashtag" rel="tag">#<span>uottawa</span></a>) <a href="https://mcgillnews.mcgill.ca/s/1762/news/interior.aspx?sid=1762&gid=2&pgid=1190" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">mcgillnews.mcgill.ca/s/1762/ne</span><span class="invisible">ws/interior.aspx?sid=1762&gid=2&pgid=1190</span></a></p><p><a href="https://en.wikipedia.org/wiki/Nuvvuagittuq_Greenstone_Belt" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Nuvvuagi</span><span class="invisible">ttuq_Greenstone_Belt</span></a></p><p>Some of the rind remains and is compositionally distinct. Recent work has used triple oxygen to constrain seawater chemistry (<a href="https://www.sciencedirect.com/science/article/abs/pii/S0012821X22001753" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">sciencedirect.com/science/arti</span><span class="invisible">cle/abs/pii/S0012821X22001753</span></a>)<br /><a href="https://fosstodon.org/tags/Hadean" class="mention hashtag" rel="tag">#<span>Hadean</span></a> <a href="https://fosstodon.org/tags/McGilUniversity" class="mention hashtag" rel="tag">#<span>McGilUniversity</span></a> <a href="https://fosstodon.org/tags/PillowBasalt" class="mention hashtag" rel="tag">#<span>PillowBasalt</span></a></p>
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#pillowbasalt
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Chris White<p><span class="h-card"><a href="https://scicomm.xyz/@allochthonous" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>allochthonous</span></a></span> <span class="h-card"><a href="https://fosstodon.org/@silicatefondue" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>silicatefondue</span></a></span> <span class="h-card"><a href="https://mastodon.social/@geo_garver" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>geo_garver</span></a></span> </p><p>Fabulous <a href="https://sciencemastodon.com/tags/pillowBasalt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pillowBasalt</span></a> image, and I’m happy to have visited your website. Please keep the cross cutting relationship animation up, I’ll refer my <a href="https://sciencemastodon.com/tags/EarthScience" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>EarthScience</span></a> class at <a href="https://sciencemastodon.com/tags/UMassBoston" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UMassBoston</span></a> to it. Super!</p>
Bill Minarik<p>Compare the Nuvvuagittuq Greenstone Belt pillows with those from the 3.5 billion year old Barberton Greenstone Belt, South Africa, visited by <span class="h-card" translate="no"><a href="https://scicomm.xyz/@allochthonous" class="u-url mention">@<span>allochthonous</span></a></span> </p><p><a href="https://all-geo.org/highlyallochthonous/2007/07/what-is-a-greenstone-belt/" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">all-geo.org/highlyallochthonou</span><span class="invisible">s/2007/07/what-is-a-greenstone-belt/</span></a></p><p>or the pillows of <span class="h-card" translate="no"><a href="https://mastodon.social/@geo_garver" class="u-url mention">@<span>geo_garver</span></a></span> from the 57 Ma Resurrection Peninsula Ophiolite, Alaska.<br /><a href="https://fosstodon.org/@geo_garver@mastodon.social/109540738352007159" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">fosstodon.org/@geo_garver@mast</span><span class="invisible">odon.social/109540738352007159</span></a> <a href="https://fosstodon.org/tags/PillowBasalt" class="mention hashtag" rel="tag">#<span>PillowBasalt</span></a> 2/2</p>
Bill Minarik<p>The pillow rinds have preferentially weathered, outlining the basalt pillows formed at least 3.75 and perhaps as long ago as 4.3 billion years ago. Now metamorphosed to amphibolite grade. In the Ujaraaluk unit of the Nuvvuagittuq Greenstone Belt, near <a href="https://fosstodon.org/tags/Inukjuak" class="mention hashtag" rel="tag">#<span>Inukjuak</span></a>, northern <a href="https://fosstodon.org/tags/Quebec" class="mention hashtag" rel="tag">#<span>Quebec</span></a>. <a href="https://fosstodon.org/tags/McGill" class="mention hashtag" rel="tag">#<span>McGill</span></a> University <a href="https://fosstodon.org/tags/EarthSystemScience" class="mention hashtag" rel="tag">#<span>EarthSystemScience</span></a> <a href="https://fosstodon.org/tags/PillowBasalt" class="mention hashtag" rel="tag">#<span>PillowBasalt</span></a> <a href="https://fosstodon.org/tags/Hadean" class="mention hashtag" rel="tag">#<span>Hadean</span></a> 1/2</p>
John Garver<p>Pillow basalts of the 57 Ma Resurrection Peninsula Ophiolite, Alaska. </p><p>These are some of the most spectacular pillows I've seen. <br>These represent eruption of basaltic magma to the ocean floor, and they are directly related to the sheeted dike complex recently posted. </p><p>The Stellar sea lions have hauled out on a detached block with exposed flow tops.</p><p><a href="https://mastodon.social/tags/Alaska" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Alaska</span></a> <a href="https://mastodon.social/tags/Ophiolite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ophiolite</span></a> <a href="https://mastodon.social/tags/PillowBasalt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PillowBasalt</span></a> <a href="https://mastodon.social/tags/Paleocene" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Paleocene</span></a> <a href="https://mastodon.social/tags/Chugach" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Chugach</span></a></p>
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