Pattern Formation from a Rapidly-cooling Supercooled Melt Droplet 4.6 Billion Years Ago(<Special Topic>How Do We Model Crystal Growth Phenomena?)

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  • Miura Hitoshi
    Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University

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  • 46億年昔の結晶成長 : 急冷する過冷却液滴内部のパターン形成(<特集>どのように結晶成長現象をモデル化するか?)
  • 46億年昔の結晶成長--急冷する過冷却液滴内部のパターン形成
  • 46オクネン ムカシ ノ ケッショウ セイチョウ キュウレイ スル カレイキャク エキテキ ナイブ ノ パターン ケイセイ

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Various kinds of crystals are contained in meteorites and comets in our solar system. They were formed in early solar system 4.6 billion years ago, and have unique features reflecting the peculiar crystal growth environment in space. It would be possible to imagine the history of our solar system by elucidating the origin of these cosmic crystals. In the present paper, we briefly review the traditional researches on formation of chondrules, which are submillimeter-sized, spherical-shaped grains consisting mainly of silicate material observed in chondritic meteorites. Then, we explain the relationship between the solidication texture of chondrules and the pattern formation of a supercooled melt droplet during rapid cooling.

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