Office: 284 Kolthoff Hall
Lab: 261 Kolthoff Hall

Email: zhan1442@...
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I am interested in the redox state with depth of the magma ocean, and the relationship between early atmosphere and magma ocean redox state. My research will focus on measuring Fe³⁺/Fe^TOT in glasses, which will be quenched from a range of pressures to quantify the thermodynamics of Fe³⁺/Fe²⁺ speciation in magmas. We will apply these to the likely oxidation state and gas speciation of early planetary atmosphere that have interacted with a magma ocean. Appropriate equations of the relationship between oxygen fugacity, pressure, and the valence state of iron in magmas will be calculated.

The analysis method will mainly be Mössbauer and XANES (X-Ray Near-Edge Structure) spectroscopy. Mössbauer spectroscopy can analyze Fe oxidation state well, but XANES analysis can measure Fe³⁺/Fe^TOT ratios in silicate glasses even more precisely. Mössbauer analysis will be performed at the Institute for Rock Magnetism (IRM) at the University of Minnesota.