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SUMMARY:Constraining Carbon in Earth’s Mantle - Dr. Joshua Shea\, Univer
 sity of Cambridge
DTSTART:20260223T130000Z
DTEND:20260223T140000Z
UID:TALK244291@talks.cam.ac.uk
CONTACT:Natalie Deng
DESCRIPTION:In situ carbon isotopes are a powerful but under-utilised trac
 er of mantle processes\, in part due to analytical challenges and lack of 
 reference materials. In this talk\, I present a new SIMS method for concur
 rently measuring carbon isotopes and carbon concentration in basaltic glas
 s\, enabling improved precision at low carbon concentrations and high spat
 ial resolution. Applying this method to olivine-hosted melt inclusions\, I
  first describe recent work constraining the convecting upper mantle\, whi
 ch yields a more positive and more tightly defined δ13C value than previo
 usly assumed\, along with a lower organic burial fraction of carbon. I the
 n present results from the Icelandic primordial mantle reservoir sampled a
 t Miðfell\, revealing anomalously heavy carbon isotopic compositions coup
 led with depleted incompatible element concentrations\, potentially linkin
 g early core formation to modern mantle heterogeneity. Together\, these re
 sults refine the mantle carbon baseline and deep carbon cycle and demonstr
 ate how melt inclusions retain isotopic memory of Earth’s interior proce
 sses.
LOCATION:Harker 1\, Dept of Earth Sciences 
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