初期の太陽系. 初期の太陽系. 太陽系内部の水は,炭酸塩状のコンドライトのような源から水が早期に蓄積された
Adam R Sarafian1, Sune G Nielsen2, Horst R Marschall3
1Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. asarafian@whoi.edu.
Science (New York, N.Y.)
|November 1, 2014
まとめ
ヴェスタのような水に富んだ小惑星は,初期の地球に必要不可欠な揮発性物質を運びました. この発見は,地球が地球であることを示唆しています.
科学分野:
- 惑星科学は惑星科学である.
- 天体生物学 アストロバイオロジー
- 地質化学 地質化学
背景:
- 太陽系内部の水の蓄積の起源とタイミングを理解することは,惑星形成理論にとって極めて重要です.
- 水の配給のタイミングは,地球上の生命の初期の出現のモデルに影響を与えます.
研究 の 目的:
- 小惑星4 Vesta.からのユークリット隕石のアパタイトの水素同位体組成を調べるために.
- ヴェスタが,地球の揮発性物質の在庫に関連した古代の水素貯蔵庫を表しているかどうかを判断するために.
主な方法:
- 水素同位体組成のインサイト測定.
- エウクリット隕石内のアパタイト鉱物のサンプルを分析する.
主要な成果:
- ヴェスタは,炭酸性コンドライトと同じ水素同位体組成を示している.
- ヴェスタに起源を持つユークリット隕石には,古代の水素貯蔵庫があります.
- 水素,炭素,窒素における同位体相似性は,ヴェスタと地球の間に存在する.
結論:
- 水を含む揮発性物質は,地球に早期に蓄積された可能性があります.
- これは,揮発性の概念が,蓄積期の遅い段階でのみ獲得されるという概念に異議を唱える.
- ヴェスタは,地上の惑星に早期に揮発性物質を届けるための潜在的なアナログとして機能します.
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