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SUMMARY:Novel applications of non-traditional stable isotopes to studying 
 near-equilibrium geochemical kinetics with applications to carbon removal 
 and storage - Chen Zhu\, Indiana University\, Bloomington
DTSTART:20230613T110000Z
DTEND:20230613T120000Z
UID:TALK177038@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION:The isotope-doping method holds the promise of transforming ne
 ar-equilibrium reaction kinetics research\, which provides the urgently ne
 eded experimental data for closing knowledge gaps in CO2 removal and stora
 ge for climate change mitigation. With the availability of non-traditional
  isotopes\, we see an unprecedented opportunity for breaking conceptual ba
 rriers and methodological impasses. In this seminar\, I will present three
  examples of our recent work. First\, 29Si-doped experiments on quartz\, f
 eldspars\, and kaolinite dissolution tested the hypothesis of mechanism sw
 itch from far from equilibrium to near equilibrium and illustrated the way
  to model irreversible reactions. Second\, we measured the isotope exchang
 e rates at solubility equilibrium for barite with 137Ba and 32S doping in 
 initial solutions. Extrapolation of the lab-measured exchange rates to mar
 ine sediment conditions suggests a reset of isotope signatures within year
 s. These new experimental data\, together with new data in the literature\
 , beg to question the fidelity of many mineral paleo-environmental proxies
 . Third\, new 145Nd-doped monazite solubility experiments at high P-T show
  promise to circumvent the re-precipitation problem in solubility measurem
 ents. The solubility of rare earth elements is central to critical mineral
 s research and exploration. Many climate change mitigation solutions are b
 ased on CO2-water-mineral interactions. Our research aims to provide a bas
 ic scientific foundation for mitigation efforts.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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