火星からの火星の内部構造と初期の熱的進化グローバルサーベイヤートポグラフィーと重力

M T Zuber¹, S C Solomon, R J Phillips

¹Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. zuber@mit.edu

Science (New York, N.Y.)

|March 10, 2000

まとめ

Mars Global Surveyorのデータは,2つの異なる地殻地帯を明らかにし,地質の二分法とは相関していない. これらの発見は,北半球の初期の熱流と北方への水路輸送を示唆しています.

科学分野:

惑星科学は惑星科学である.
地質物理学地質物理学とは地質物理学です.
地質学地質学地質学

背景:

火星は,現在の構造に影響を及ぼした複雑な地質の歴史を示しています.
火星の内部構造を理解することは,その進化を解読する鍵です.

研究の目的:

火星の地球殻と上部マントルの構造を決定する.
地殻地帯と地質学的特徴の関係を調査する.
初期の火星の熱史と水活動の推論をするために.

主な方法:

火星グローバルサーベイヤーからの地形と重力データの分析.
地殻と石層の厚さのモデリング.
火星の低地における地質学的構造の解釈.

主要な成果:

2つの異なる地殻地帯が特定されました:一つは南から北へ薄くなり,もう一つは均一な厚さがあります.
地殻の領域は,地球学的二分法と全体的に相関しない.
北半球における初期の高熱流の証拠である.
北部の低地にある埋もれた運河は,水と堆積物の移動が北へ向かったことを示唆している.

結論:

火星の地殻構造は複雑で,二分法によってのみ定義されるものではない.
初期の火星の歴史には,かなりの熱流と水理学的なプロセスが含まれていた可能性が高い.
リソスフィアの強度は,積荷の場所と時間によって異なります.

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火星からの火星の内部構造と初期の熱的進化 グローバルサーベイヤー トポグラフィーと重力