Experimental evidence for Mo isotope fractionation between metal and silicate liquids

摘要: Abstract Stable isotope fractionation of siderophile elements may inform on the conditions and chemical consequences core–mantle differentiation in planetary objects. The extent to which Mo isotopes fractionate during such metal–silicate segregation, however, is so far unexplored. We have therefore investigated equilibrium between liquid metal silicate evaluate potential as a new tool study core formation. performed experiments at 1400 1600 °C centrifuging piston cylinder. Tin was used lower melting temperature Fe-based alloys 0.19 ± 0.03 ‰ (95% confidence interval) heavier than that metal. This not significantly affected by presence or absence carbon. Molybdenum furthermore independent oxygen fugacity range IW −1.79 +0.47, are plausible values for Experiments show that, equilibrium, 98Mo/95Mo ratio 0.12 0.02 Sn does affect this fractionation. Equilibrium function can be described Δ Metal – Silicate 98 / 95 = − 4.70 ( 0.59 ) × 10 5 T 2 . Our resolvable up equilibration temperatures about 2500 °C, rendering novel investigate formation objects ranging from planetesimals Earth sized bodies.