Data for: Fe-Mg in olivine: simultaneous experimental determination of the diffusion-driven isotope fractionation along with tracer- and inter-diffusion coefficients

We have performed a series of diffusion experiments at temperatures of 1100-1300°C and variable oxygen fugacities using a 25Mg- and 57Fe-enriched powder source to produce Fe-Mg chemical and isotopic diffusion profiles in crystallographically oriented San Carlos olivine crystal cuboids. Experimental parameters have been systematically varied in order to investigate the dependence of βFe and βMg (kinetic isotope fractionation factors) on temperature, crystallographic orientation, and composition. Chemical and isotopic diffusion profiles were analyzed by electron microprobe and femtosecond-laser ablation-ICP-MS (major and minor element concentrations), and by femtosecond-laser ablation-MC-ICP-MS (Fe-Mg isotopic variations). Additionally, we have applied a multicomponent diffusion model which considers the coupled diffusion of Fe and Mg isotopes in order to simulate the measured chemical and isotopic zoning of our experimental olivine crystals. This allows to simultaneously determine accurate βFe- and βMg-values as well as the tracer diffusion coefficients of Fe and Mg (D*Fe, D*Mg) in olivine.

The files listed below contain:
- forsterite zoning profiles measured by laser ablation depth profiling, by laser ablation linescans, and by electron probe microanalyis (D1).
- input data for multicomponent diffusion model in order to fit Fe-Mg chemical and isotopic diffusion profiles in San Carlos olivine crystal cuboids (D2).
- βFe-, βMg-values, and diffusion coefficients determined experimentally at log(fO2) ≈ -5 [Pa] in this study (D3).
- βFe-, βMg-values, and diffusion coefficients determined experimentally at variable oxygen fugacities in this study (D4).
- β-values and β-ratios used in multicomponent diffusion simulation in comparison with β-values and β-ratios obtained by fitting such simulated profiles with conventional diffusion modeling (D5).
- mean values of βFe and βMg as determined in this study for the temperature range 1100-1300°C and at log(fO2 [Pa]) between -7.1 and -2.3 (D6).
- result figures of simulations of measured Fe-Mg chemical and isotopic profiles (MATLAB fits), using our multicomponent diffusion model (D7).
- characterization of the powder source of our diffusion experiments: BSE and images and results of EDX analyses using a ThermoFisher DualBeam FIB-SEM Scios2 (D8).
- Fe-Mg inter-diffusion coefficients obtained by (conventionally) modeling Fe-Mg chemical profiles (see Eqn. 7 in the main paper) measured by electron probe microanalysis on mounted SC-Ol crystal cuboids (D9).