[Latinmag] Fw: MagNetZ: March 31

[Augusto Rapalini]

Dr. Augusto Rapalini
IGEBA (Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires)
Depto. Cs. Geológicas - Facultad de Ciencias Exactas y Naturales
Universidad de Buenos Aires
Pabellón 2, Ciudad Universitaria, 
1428 Buenos Aires Argentina
Fax 54-11-47830696
rapalini en gl.fcen.uba.ar
augrap en yahoo.com.ar 

   ----- Mensaje reenviado ----- De: Paterson, Greig <greig.paterson en liverpool.ac.uk>Enviado: lunes, 29 de marzo de 2021 09:37:33 a. m. GMT-3Asunto: MagNetZ: March 31
  


Hi all,
 
  
 
Here are the details for this Wednesday's MagNetZ, whereJay Shah will be talking about "Evidence for an intermittent lunar dynamo" (Abstract below).
 
  
 
The meeting room will open at ~15:50 BST and the presentation will start at 16:00.Please note the change from GMT to BST and other any recent daylight savings time changes that may affect you.
 
  
 
Your 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.
 
  
 
The seminars are recorded, so continued 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.
 
  
 
Topic: MagNetZ
 
Time: Mar 31, 2021 16:00 London
 
 

Join Zoom Meeting
 
https://liverpool-ac-uk.zoom.us/j/99825120557?pwd=ZUdhRi93SkxGYXh4aXJXRDE4VmwxUT09
 
 

Meeting ID: 998 2512 0557
 
Passcode: d281#K1?
 
 

 

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.
 
 

Please note that if you do not wish to receive these updates please contact Greig Paterson (greig.paterson en liverpool.ac.uk) to be removed from the mailing list.
 
 
 
All the best 
 
The MagNetZ Team
 
  
 
  
 
Abstract:
 
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.
 


  
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