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<title>core core flow – JOIDES Resolution</title>
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<title>core core flow – JOIDES Resolution</title>
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<title>Sampling Sampler</title>
<link>https://joidesresolution.org/sampling-sampler/?utm_source=rss&utm_medium=rss&utm_campaign=sampling-sampler</link>
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<dc:creator><![CDATA[Naomi Barshi]]></dc:creator>
<pubDate>Sat, 13 Aug 2016 22:43:51 +0000</pubDate>
<category><![CDATA[core]]></category>
<category><![CDATA[core core flow]]></category>
<category><![CDATA[core flow]]></category>
<category><![CDATA[EXP362]]></category>
<category><![CDATA[Expedition 362 Sumatra Seismogenic Zone]]></category>
<category><![CDATA[sampling]]></category>
<category><![CDATA[Sumatra Seismogenic Zone sampling]]></category>
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<description><![CDATA[After the core comes on deck at the catwalk and whole-round samples are taken for fossils and chemistry, it comes... <div class="read-more"><a class="excerpt-read-more" href="https://joidesresolution.org/sampling-sampler/" title="Continue reading Sampling Sampler">Read more<i class="fa fa-angle-right"></i></a></div>]]></description>
<content:encoded><![CDATA[<p>After the core comes on deck at the catwalk and whole-round samples are taken for fossils and chemistry, it comes indoors for the rest of its life. Then measurements and sampling really get underway.<br />
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<p>The story of core from catwalk to description table is a post for another time. Today (Sunday morning on board) we’ve been taking samples from yesterday’s cores since no new core has come up for a few hours. Instead of coring, we’ve sent instruments down the borehole to measure the temperature and pressure under the ocean floor. Until we get those results, here’s how sampling works on this expedition. </p>
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<p><img fetchpriority="high" decoding="async" alt="Scientists get a first look at a core after it was cut in half. They're looking for patterns in the sediment that can tell us about how the sediments were deposited, where they came from, and how they'll behave when they get to the Sumatra subduction zone." src="/sites/default/files/u375/DSC_3034.jpg" style="border: 3px solid; margin: 5px; float: left;" height="186" width="328" /></p>
<p>First, the split core gets laid out on description tables. The archive<br />
half, which will stay undisturbed for future generations, goes to the<br />
sedimentologists who look at the colors, compositions, and patterns of<br />
the sediments. They take tiny samples on the ends of toothpicks and<br />
smear those over glass slides so they can look at the sediments more<br />
closely under microscopes. At the same time, structural geologists<br />
examine the working half, looking for signs of deformation, like cracks<br />
and faults and folds. On this expedition, they’ll also estimate how<br />
strong the sediments are. Strength is how much force a material<br />
can withstand before it yields and deforms. In this core, the<br />
sediments are compacted mud, made mostly of clay. As you know from playing with clay and making ceramics, clay is very weak. It doesn’t take much force to make it change its shape. If you read Brian’s recent blog post, you’ll know that we found tens of meters of sand in recent cores. Sand has completely different strength from compacted mud. It’s pretty easy to destroy a sand castle, but it takes much more work to squish an unfired clay statue. (Side note: play with some squishable things that you have at home. Try bread, tofu, cooked carrots–how these things behave are very different from each other because they have different strength! You’re doing experiments like real earth scientists, though we usually squish rocks with big machines that are much stronger than our hands.)
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<p><img decoding="async" alt="The archive half of the core undergoes high-resolution scanning and several " non-intrusive"="" analyses.="" "="" src="/sites/default/files/u375/DSC_3037.jpg" style="border: 3px solid; margin: 5px; float: left;" height="249" width="372" /></p>
<p>The archive half goes for high-resolution scanning and several different<br />
measurements that help scientists identify the composition of the<br />
sediments and correlate observations and measurements from other<br />
instruments. Printed copies of the core scan are useful for taking notes and recording observations!
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<p>The whole sample plan is agreed upon by everyone in the Science Party and reviewed by the Co-Chief<br />
Scientists even before drilling begins. The scientists assigned to a sampling shift put flags where samples will<br />
be taken based on sampling requests from their colleagues. The flags are color-coded and labeled to show what kind of sample is to be taken (see teaser photo for this post). The first samples that come out of the working half are for Moisture and Density (MAD). Since the sediment is fairly soft, we can remove these and other samples using little plastic tubes. The holes left behind get plugged with foam shapes that match the tube size. How clever!
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<p><img decoding="async" alt="Samples are taken from the working half of the core according to a pre-approved plan agreed upon by all the scientists." src="/sites/default/files/u375/DSC_3049.jpg" style="border: 3px solid; margin: 5px; float: left;" height="254" width="377" /></p>
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<p>Here Freya samples with a metal scoop to get a bigger sample than is possible with the little tubes. She’s looking for diatoms, tiny creatures that build their skeletons out of silica. They’ve been around on Earth for a long time, but their shapes have changed enough over time that if she finds some in a sample, she can tell approximately how old that sample is from the shape or kind of diatoms.
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<p>Abby keeps track of who requested what samples, even if those people are sleeping right now! When the night shift goes to bed, the day shift will take over and do the same thing. Stay tuned…
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