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Reproduction Experiments of Radial Pyroxene Chondrules Using a Gas-jet Levitation System under Reduced Conditions
Reproduction experiments of radial pyroxene (RP) chondrules were carried out using an Ar–H 2 or Ar gas-jet levitation system in a reducing atmosphere in order to simulate chondrule formation in the protoplanetary disk. The experiments reproduced RP-chondrule textures, consisting of sets of thin pyro...
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Published in: | The Astrophysical journal 2024-01, Vol.961 (1), p.129 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | Reproduction experiments of radial pyroxene (RP) chondrules were carried out using an Ar–H
2
or Ar gas-jet levitation system in a reducing atmosphere in order to simulate chondrule formation in the protoplanetary disk. The experiments reproduced RP-chondrule textures, consisting of sets of thin pyroxene crystals and mesostasis glass between crystals. However, iron partition coefficients between pyroxene and glassy mesostasis (D
Fe
=Fe mol%
pyroxene
/Fe mol%
mesostasis
) in natural RP chondrules were much higher than that in the experimentally reproduced RP chondrules. The high D
Fe
in natural RP chondrules suggests that iron was removed from the mesostasis melt at high temperatures after the growth of pyroxene crystals. We found that many small iron-metal inclusions had formed in the mesostasis glass, indicating that FeO in the high-temperature melt of mesostasis was reduced to metallic iron, and iron in the mesostasis diffused into the newly formed metal inclusions. The formation of the iron-metal inclusions in the mesostasis was reproduced by our experiments in a reducing atmosphere, confirming that D
Fe
in natural RP chondrules increased after the growth of RP crystals. Therefore, the D
Fe
of RP chondrules can be an indicator to constrain cooling rates and redox states during chondrule formation. |
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ISSN: | 0004-637X 1538-4357 |
DOI: | 10.3847/1538-4357/ad09e7 |