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#speleothems

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Jeff Munroe<p>Written in stone. When illuminated like this, it's easy to see how geologists can use rock formations growing in caves as archives of the past. Photo by T. Holmes. <a href="https://fediscience.org/tags/caves" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>caves</span></a> <a href="https://fediscience.org/tags/cave" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cave</span></a> <a href="https://fediscience.org/tags/utah" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>utah</span></a> <a href="https://fediscience.org/tags/geology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>geology</span></a> <a href="https://fediscience.org/tags/earthscience" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>earthscience</span></a> <a href="https://fediscience.org/tags/speleothems" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>speleothems</span></a></p>
Dr Micha Campbell<p><a href="https://fediscience.org/tags/PaperClub" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>PaperClub</span></a> is back for the start of 2025, and we're kicking off with Patterson et al (2024), who present a PCP-corrected stalagmite d18O record from Vietnam, spanning 45-4 ka. Interesting paper, and the whole 'PCP impacts on d18O' thing has been getting quite a lot of airtime in recent years. Hopefully without sounding like a hater, I remain a bit skeptical. In this instance, the model assumptions include a feeding stalactite drip rate of 1 drip/second, which seems too high for LGM (where PCP effect on the stal was greatest). For stalactite PCP to be recorded in a stalagmite, there must not be sufficient residence time for re-equilibration to occur. I would love to see a sensitivity test of the drip rate on the model. </p><p>Growth rates during the 'peak PCP' period were also extremely low (&lt;5 um/yr), which suggests to me that growth was likely not continuous over the period. d18O vals were high, I assume there was greater opportunity for disequilibrium to drive the signal rather than PCP?</p><p>Anyway, I'm definitely no expert in d18O kinetics, and I'm looking forward to hearing the opinions of the group, and anyone else who has read the paper :) I am really happy to be wrong about this, as there are lots of clever people on the paper who know more than me about this stuff!</p><p><a href="https://fediscience.org/tags/Paleoclimate" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Paleoclimate</span></a> <a href="https://fediscience.org/tags/Speleothems" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Speleothems</span></a> <a href="https://fediscience.org/tags/speleology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>speleology</span></a> <br> <a href="https://www.nature.com/articles/s41467-024-53422-y" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">nature.com/articles/s41467-024</span><span class="invisible">-53422-y</span></a></p>
Dr Micha Campbell<p>Box of rocks arrived for me today 😍 we will be taking these beauties to the Aus Synchrotron next month to get an idea if they might be suitable for <a href="https://fediscience.org/tags/palaeofire" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>palaeofire</span></a> research. Happily, these were collected by a friend of mine for her PhD, which means a potential collaboration with a friend (yay!), and the reuse of old samples rather than collecting new (double yay!).</p><p><a href="https://fediscience.org/tags/speleothems" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>speleothems</span></a> <a href="https://fediscience.org/tags/palaeoclimate" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>palaeoclimate</span></a></p>
Dr Micha Campbell<p>Woohoo it's paper publishing day! So pleased to have this article out in the light of day, and published <a href="https://fediscience.org/tags/OpenAccess" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>OpenAccess</span></a> in Reviews of Geophysics. We give you everything we know about <a href="https://fediscience.org/tags/speleothems" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>speleothems</span></a> as <a href="https://fediscience.org/tags/palaeofire" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>palaeofire</span></a> archives, including tips on sample and site selection, and appropriate methods. We then sweeten the deal with four case studies. </p><p>This one was a huge team effort, and could not have been written without the involvement of all the co-authors (👋 <span class="h-card"><a href="https://aus.social/@Andbaker" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>Andbaker</span></a></span>).</p><p><a href="https://fediscience.org/tags/AcWri" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AcWri</span></a> <a href="https://fediscience.org/tags/Academia" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Academia</span></a></p>
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