An experimental study on the condensation reaction during the chondrule formation using the pressure controlled system

2014 Fiscal Year Final Research Report

• Project/Area Number: 23340165
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: National Institute of Polar Research
• Principal Investigator: IMAE Naoya 国立極地研究所, 研究教育系, 助教 (60271037)
• Co-Investigator(Kenkyū-buntansha): ISOBE Hiroshi 熊本大学, 自然科学研究科, 教授 (80311869) ; YAMAGUCHI Akira 国立極地研究所, 研究教育系, 助教 (70321560)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: コンドリュール / 原始太陽系星雲 / 再現実験 / I型コンドリュール / 還元雰囲気 / 蒸発 / 凝縮

Outline of Final Research Achievements

A furnace for chondrule reproduction was newly developed. Introducing hydrogen gas, the pressure is controlled to be in the order of 0.1-1000Pa. As starting materials of the experiments, the sintered pellets of the powder with the chondritic compositions were prepared. Mg-silicate minerals (forsterite and enstatite) crystallized under the reduced condition. The porphyritic textured forsterite and enstatite crystallized. The metal depleted textures were observed at lower pressures (less than 100Pa) due to the iron evaporation during the melting, but the metal droplets were observed at higher total pressure of (>1000Pa). Small kamacite droplets less than 10 micron m in size are heterogeneously included in natural type I chondrules. The run products would nearly reproduce the textures and compositions of the type I chondrules.

Free Research Field

岩石・鉱物・鉱床学