[P-PS14] 宇宙における物質の形成と進化

[PPS14-P02] エンスタタイト凝縮実験に向けた装置改良とSiO₂-MgO蒸発実験

*瀧川 晶^1,2 (1.京都大学大学院理学研究科地球惑星科学専攻地質学鉱物学教室、2.京都大学白眉センター)

キーワード：実験、凝縮、蒸発、エンスタタイト

Enstatite whiskers elongated to the [001] axis were identified in chondritic porous interplanetary dust particles (CP-IDPs), Antarctica Micrometeorite (AMM), and samples from a comet Wild 2, while those elongated to the [001] axis are common in minerals occurred in the Earth and meteorites [1-4]. The condensation conditions of enstatite whiskers, however, have not been shown quantitatively. Moreover, the difference in the morphology of enstatite whiskers may reflect their different condensation conditions in the early solar system. In order to constrain on the formation conditions of enstatite whiskers with different crystal habits, we aim to construct the experimental setup that can control the condensation temperature, supersaturation ratio, and partial pressure of a hydrogen gas. In this presentation, we report the current status of our experimental setups and preliminary results of SiO₂-MgO evaporation experiments.
[1] J. P, Bradley , D. E. BrownLee , D, R, Veblen, Nature 301, 473 (1983).
[2] Noguchi et al . (2008), MAPS, Abst# 5129.
[3] Ishii H.A. et al. (2008), Science 319, 447-450.
[4] Nakamura-Messenger et al. (2009) , MAPS, Abst# 5330.