フェニックス着陸地での火星大気中のCO2の安定同位体測定
Paul B Niles1, William V Boynton, John H Hoffman
1Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA. paul.b.niles@nasa.gov
まとめ
火星の二酸化炭素の安定同位体分析は,火山活動と水と岩の相互作用が進行していることを明らかにしています. これらの発見は,惑星のモデル化に役立ちます.
科学分野:
- 惑星科学は惑星科学である.
- アストロジオロジー アストロジオロジー
- 地質化学 地質化学
背景:
- 二酸化炭素は火星の大気の主要な成分です.
- その安定した同位体組成は,惑星の揮発性歴史の洞察を提供します.
- 以前の研究では,火星の大気と隕石の組成を分析した.
研究 の 目的:
- 火星の二酸化炭素の安定した同位体成分を分析するために.
- 火山からの脱ガスと水と岩の相互作用が火星の大気に及ぼす影響を理解するために.
- 火星の水,火山活動,大気の進化の歴史を制限するモデルを構築する.
主な方法:
- ウィーン・ピー・ディー・ベレムナイト (VPDB) に関する炭素同位体 (δ13C) の測定.
- ウィーン標準平均海洋水 (VSMOW) に相対する酸素同位体 (δ18O) の測定.
- 火星フェニックス宇宙船のデータを火星の隕石データと統合.
主要な成果:
- 炭素同位体の測定値: δ13C ((VPDB) = -2.5 ± 4.3 / ミリ.
- 酸素同位体の測定値: δ18O ((VSMOW)) = 31.0 ± 5.7 千分.
- 結果は,現代の火山による脱ガスと液体の水による均衡の有意な影響を示しています.
結論:
- 低温の水と岩の相互作用は,火星の歴史を通して支配的であった.
- 炭酸塩の形成は,火星で活発で進行中のプロセスです.
- 最近の火山の排気は,現代の火星の大気の組成に大きな影響を与えています.
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