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Reproduction experiments of radial pyroxene (RP) chondrules were carried outusing an Ar-$\mathrm{H_2}$ or Ar gas-jet levitation system in a reducingatmosphere in order to simulate chondrule formation in the protoplanetary disk.The experiments reproduced RP-chondrule textures, consisting of sets of thinpyroxene crystals and mesostasis glass between crystals. However, ironpartition coefficients between pyroxene and glassy mesostasis ($\rm{D_{Fe}}$ =Fe mol$\rm{\%_{pyroxene}}$ / Fe mol$\rm{\%_{mesostasis}}$) in natural RPchondrules were much higher than that in experimentally reproduced RPchondrules. The high $\rm{D_{Fe}}$ in natural RP chondrules suggest that ironwas removed from the mesostasis melt at high temperatures after the growth ofpyroxene crystals. We found that many small iron-metal inclusions had formed inthe mesostasis glass, indicating that FeO in the high-temperature melt ofmesostasis was reduced to metallic iron, and iron in the mesostasis diffusedinto the newly formed metal inclusions. The formation of the iron-metalinclusions in the mesostasis was reproduced by our experiments in a reducingatmosphere, confirming that $\rm{D_{Fe}}$ in natural RP chondrules increasedafter the growth of RP crystals. Therefore, the $\rm{D_{Fe}}$ of RP chondrulescan be an indicator to constrain cooling rates and redox states duringchondrule formation.

Reproduction Experiments of Radial Pyroxene Chondrules Using a Gas-jet Levitation System under Reduced Conditions