絶滅した (129) I は,原始的な隕石からのハライトで,太陽系の初期に蒸発石が形成された証拠です
1Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK. Department of Mineralogy, Natural History Museum, London, SW7 5BD, UK.
まとめ
ザグコンドライトのハライト結晶は純粋なクセノン-129を含んでおり,初期の太陽系形成を示しています. この発見は,太陽系誕生直後,水性流体からハライトが急速に形成されたことを示唆している.
科学分野:
- 宇宙化学 (コスモケミストリー)
- 惑星科学は惑星科学である.
- イソトープ地球化学 イソトープ地球化学
背景:
- 初期の太陽系材料は,私たちの太陽系の形成と進化の洞察を提供します.
- ヨウ素-129 ((129) I) のような短命同位体の放射性崩壊は,初期の太陽系イベントの重要なクロノメーターです.
- クセノンイソトープ,特にクセノン-129 ((129) Xe) は,核合成と初期の太陽系過程を理解するための重要なトレーサーです.
研究 の 目的:
- ザグH3-6コンドライトにおけるハライト形成の起源とタイミングを調査する.
- 初期太陽系におけるヨウ素-129とヨウ素-127 ((129) I/ ((127) I) の初期比率を決定する.
- ハライトの形成の時間スケールを,最も古い太陽系物質と比較して制限するために.
主な方法:
- ザグH3-6コンドライトのハライト結晶内のクセノンイソトープ,特に (129) Xeの分析.
- ニュートロン放射 (127) I.I.から自然に発生する (129) Xeと人工的に生成された (128) Xeを含む相関放出実験.
- (129) I から (129) Xe の崩壊を用いた放射線年代測定.
主要な成果:
- ハライト結晶は,本質的に純粋でモノ同位体 (129) Xe を含んでいるが,これは初期の太陽系の崩壊に起因する (129) I.I.
- 初期 (129) I/(127) I比は (1.35 +/- 0.05) x 10 ((-4),原始的な太陽系値と一致するように決定されました.
- (129) Xeの存在は,2百万年以内に水性流体から形成されたハライトが,最も古い既知の太陽系鉱物であることを示唆しています.
結論:
- ザグコンドライトのハライトは,初期の太陽系核合成とタイミングの記録として機能します.
- ハライトの急速な形成は,初期の太陽星雲における揮発性物質の効率的な処理を示しています.
- この研究は,初期の太陽系プロセスと特定の鉱物相の形成のタイムラインを精錬します.
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