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CATEGORIES:Class/Seminar
DESCRIPTION:Earth’s mantle has been oxidized compared to its cosmochemical 
 building blocks since the earliest Hadean. The origin of Earth’s significan
 t oxidative power is linked to Earth’s initial differentiation\, including 
 processes in magma oceans\, but these remain poorly understood. During subs
 equent evolution to the present\, Earth has developed a substantial oxidize
 d surface reservoir that amounts to approximately 20% of the oxidative powe
 r of the accessible Earth\, with the other 80% remaining in the mantle. Thi
 s surface reservoir is essential to the modern surface environment but orig
 inates largely from the mantle\, and to date\, this coupled surface-interio
 r redox evolution lacks quantification. Today\, the mantle includes domains
  with distinct redox states sampled by oceanic and mid-ocean ridge basalts\
 , though their origin\, recycled versus primordial\, is not yet illuminated
 . In this talk\, I will consider models and experiments that aid in underst
 anding the redox evolution of terrestrial planets and Earth’s subsequent de
 ep planetary redox cycling.\n\n \n\nDr. Marc Hirschmann is a Distinguished 
 McKnight Professor of Earth Sciences at the University of Minnesota\, where
  he has worked for more than 25 years.  His interests include experimental 
 and theoretical petrology\, global geochemistry\, and planetary science.  O
 ver the last decade\, his focus has been on the topics of deep Earth and pl
 anetary volatile cycles\, magma oceans and the accretion and early differen
 tiation of terrestrial planets\, redox evolution of planetary interiors\, a
 nd refinement of microbeam analytical techniques in support of these studie
 s. Hirschmann's honors include membership in the National Academy of Scienc
 es and election as a fellow in the American Academy of Arts and Sciences.
DTEND:20231114T211500Z
DTSTAMP:20260314T204607Z
DTSTART:20231114T200000Z
GEO:37.427405;-122.1697
LOCATION:Building 320\, Geology Corner\, 220 and Zoom
SEQUENCE:0
SUMMARY:EPS Seminar: Dr. Marc Hirschmann - The Deep Earth Oxygen Cycle
UID:tag:localist.com\,2008:EventInstance_44156294076551
URL:https://events.stanford.edu/event/eps_seminar_dr_marc_hirschmann_9438
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