火星の排気水:SNC隕石の溶融含有物による制約

H Y McSween, R P Harvey

Science (New York, N.Y.)

|March 26, 1993

まとめ

火星の隕石は,初期の火星のマグマには1.4%の水が含まれていたことを明らかにしています. これは,より湿った内部を示唆し,排気水が潜在的に地球深さ200メートルを形成している.

科学分野:

惑星科学惑星科学
地質化学地質化学
ミネラロジーは,鉱物学です.

背景:

シェルゴッタイト・ナクリト・チャシグニット (SNC) 隕石は,火星からの岩石と考えられています.
これらの隕石は,早期形成された結晶の中に溶けたインクルージョンを含んでおり,マグマ状態の証拠を保存しています.

研究の目的:

火星のマグマの噴火前の水分量を測定するために.
火星から地質学的な時間内に排出された水の総量を推定する.

主な方法:

SNC隕石内のアンフィボールを含む溶融インクルージョンの分析.
固化経緯の計算により,親マグマの水分含有量を推測する.
火星上の熱性物質の量を推定する.

主要な成果:

火星のマグマは通常,重量約1.4%の水を含んでいた.
39億年前に発生したガスの排出は,地球上の深さ約200メートルに相当する総水量を示唆している.
この水量は,以前の地化学的推定値より高く,洪水侵食に基づく推定値より低い.

結論:

火星の内部は,以前考えられていたよりもかなり湿った可能性が高い.
初期の火星は,地殻の安定化前に,または彗星の衝突によって,かなりの水の排出を経験しました.
これらの発見は,初期の火星の内部がより水分性の高いモデルをサポートしています.

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