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SUMMARY:Core–mantle isotopic fractionation in large terrestrial planets 
 - Dr Edith Kubik\, University College Dublin
DTSTART:20251202T120000Z
DTEND:20251202T130000Z
UID:TALK237328@talks.cam.ac.uk
CONTACT:University of Cambridge
DESCRIPTION:Isotopic signatures have been used to trace genetic links betw
 een planetary bodies\, to understand the accretional histories of planets 
 as well as the source and origin of planetary building blocks. As the larg
 est chemical mass transfer process occurring on terrestrial planets\, core
  formation is likely to impart a diagnostic imprint on the isotopic and ch
 emical signatures of planetary mantles and crusts. Understanding these iso
 topic fractionation processes is paramount in order to (1) quantify the ph
 ysical and chemical conditions under which core formation occurred on plan
 ets as well as to (2) fingerprint the effects of core formation relative t
 o other accretion-related processes (e.g. volatilisation processes\, heter
 ogeneous accretion\, late accretion). However\, the role of core formation
  in establishing the stable isotopic signatures of planetary mantles is st
 ill poorly understood. In this work\, a new multianvil technique is calibr
 ated to simulate core formation on planets as large as Mars and synthesise
  sufficient material for isotopic ratio measurements. This method is used 
 to characterise Fe isotopic fractionation between metal and silicate up to
  17 GPa\, presenting notable variation with pressure. A new series of S-be
 aring experiments show a different pattern of the Fe isotopic fractionatio
 n at high pressure. Thermal gradients are measured in the experimental set
  up to ensure their minimisation during metal–silicate equilibration in 
 the multianvil press. 
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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