ALH84001の若い年齢と,火星のシェルゴッタイトの源との地化学的な関連性
T J Lapen1, M Righter, A D Brandon
1Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, USA. tjlapen@uh.edu
Science (New York, N.Y.)
|April 17, 2010
まとめ
火星の隕石ALH84001は,火星の岩石の中で最も古い岩石で,その年齢は4091億年. その構成は,初期の火星にはマグマの海があったことを示唆し,数十億年にわたってその地質に影響を与えた.
科学分野:
- 惑星科学は惑星科学である.
- 地質化学 地質化学
- 同位体地質学とは,同位体地質学である.
背景:
- 火星の隕石ALH84001 (ALH) は,最も古い火星の岩石として知られています.
- ALHは,火星の地質学的進化と磁場を含む火星の初期の歴史に関する重要な洞察を提供します.
研究 の 目的:
- Lu-Hfイソトープデータを用いて火星隕石ALH84001の正確な火性の年齢を決定する.
- 火星の初期のマグマプロセスとマントルの源の特徴を調査する.
主な方法:
- ALH84001のルテチウム-ハフニウム (Lu-Hf) 同位体分析
- 親マグマ源のLu/HfとSm/Nd比の計算.
主要な成果:
- ALH84001の火性の年齢は,4.091 ± 0.030億年である.
- データは,深層のマグマの海で大規模な岩火処理が行われていることを示しています.
- マントルの源領域は,若いシェルゴッタイト隕石と似ています.
結論:
- 火星は,その歴史の初期に,おそらくマグマの海を含む,重要な岩火処理を経験しました.
- 均一な火性の過程は,40億年近く火星に存在している可能性がある.
- 火星のコアダイナモと磁場の停止は,この初期の火山活動と関連している可能性があります.
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