<html><head></head><body><div class="ydpb8a44633yahoo-style-wrap" style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><div><div><br></div><div><br></div><div class="ydpb8a44633signature"><div><font face="times new roman, new york, times, serif"><font size="1">Dr. Augusto Rapalini<br>IGEBA </font></font></div><div><font face="times new roman, new york, times, serif"><font size="1">(Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires)<br>Depto. Cs. Geológicas - Facultad de Ciencias Exactas y Naturales<br>Universidad de Buenos Aires<br>Pabellón 2, Ciudad Universitaria, <br>1428 Buenos Aires Argentina<br>Fax 54-11-47830696<br></font><a href="mailto:rapalini@gl.fcen.uba.ar" rel="nofollow" target="_blank"><font size="1">rapalini@gl.fcen.uba.ar</font></a><var id="ydpb8a44633yui-ie-cursor"></var><br><a href="mailto:augrap@yahoo.com.ar" rel="nofollow" target="_blank"><font size="1">augrap@yahoo.com.ar</font></a></font></div></div></div>

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                <div>----- Mensaje reenviado -----</div>

                <div><b>De:</b> Paterson, Greig <greig.paterson@liverpool.ac.uk></div><div><b>Enviado:</b> lunes, 29 de marzo de 2021 09:37:33 a. m. GMT-3</div><div><b>Asunto:</b> MagNetZ: March 31</div><div><br></div>

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Hi all,</p> 

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Here are the details for th<span lang="EN-US">is</span> Wednesday's MagNet<span lang="EN-US">Z, where</span><span lang="EN-US">

</span><span lang="EN-US">Jay Shah </span>will <span lang="EN-US">be talking</span> about "Evidence for an intermittent lunar dynamo" (Abstract below).</p> 

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The meeting room will open at ~15:<span lang="EN-US">50 <span lang="EN-US">BST and the presentation will start at 1<span lang="EN-US">6:<span lang="EN-US">00.

<b>Please note the change from GMT to BST and other any recent daylight savings time changes that may affect you</b><span lang="EN-US">.</span><span lang="EN-US"></span></p> 

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<span lang="EN-US">Y</span>our mic will initially be muted and we ask that you keep it muted during the presentation. If you find the connection is poor and slow, turning off your camera may help.</p> 

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<span lang="EN-US">The seminars are recorded, so c</span><span lang="EN-US">ontinued participation in a seminar after recording beginnings constitutes agreement for the recording to be publicly disseminated. So, we recommend muting your microphone and turning

 off your camera if you do not want to be visible.</span><span lang="EN-US"></span></p> 

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<span lang="EN-US">Topic: MagNetZ</span></p> 

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<span lang="EN-US">Time: Mar 31, 2021 16:00 London</span></p> 

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<span lang="EN-US"> </span></p>

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<span lang="EN-US">Join Zoom Meeting</span></p> 

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<span lang="EN-US">https://liverpool-ac-uk.zoom.us/j/99825120557?pwd=ZUdhRi93SkxGYXh4aXJXRDE4VmwxUT09</span></p> 

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<span lang="EN-US"> </span></p>

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<span lang="EN-US">Meeting ID: 998 2512 0557</span></p> 

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<span lang="EN-US">Passcode: d281#K1?</span></p> 

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<span lang="EN-US"> </span></p>

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<span lang="EN-US">If you want to share the details with your immediate colleagues, please let us know. Also, please remember to use your real name when joining the seminar. These are important for keeping the seminars safe and secure.</span></p> 

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<span lang="EN-US">Please note that if you do not wish to receive these updates please contact Greig Paterson (greig.paterson@liverpool.ac.uk) to be removed from the mailing list.</span></p> 

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All the best </p> 

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<span lang="EN-US">The MagNetZ Team</span></p> 

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<span lang="EN-US">Abstract:</span></p> 

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<span lang="EN-US">Paleointensity data suggest the presence of a lunar dynamo with a surface intensity reaching tens of µT during the period 4.25 to 3.56 Ga and subsequently declining to several µT during the following ~2 billion years. However, the lunar energy

 budget does not appear to be able to continuously power such a strong dynamo for so long. A proposed solution to this conundrum is that the lunar dynamo was in fact highly time-variable or even intermittently active during this period. However, until now,

 there has been no Thellier paleointensity data from Apollo lunar samples to support a time-variable dynamo. Using our newly developed oxygen fugacity controlled atmosphere thermal demagnetizer, we report new paleointensity data from lunar regolith breccias

 showing near-zero (< 0.5 µT) paleointensity at 3.3 ± 0.43 Ga and at 1.7 ± 0.43 Ga. This supports the proposal that the average field may have been significantly weaker than implied by the highest paleointensities, consistent with the expected energy budget

 for the lunar core.</span></p> 

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