ホーム・プレートのピロクラスティック活動,グセフ・クレーター,火星

S W Squyres¹, O Aharonson, B C Clark

¹Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA.

Science (New York, N.Y.)

|May 5, 2007

まとめ

火星の高原であるホームプレートは,爆発的な火山の起源を明らかにしています. その岩は,火弾性物質が堆積され,後に風によって再処理されたことを示唆し,火星への洞察を提供している.

科学分野:

惑星科学は惑星科学である.
地質学地質学地質学
火山学火山学とは

背景:

ホームプレート (Home Plate) は,火星のグセフクレーター内に位置する層状の高原です.
適度に変化したアルカリベースタル組成のクラスティック岩で特徴付けられています.
これらの岩は,特に高度に揮発性のある元素で濃縮されています.

研究の目的:

ホームプレート高原の起源と配置メカニズムを調査する.
観測された地質学的特徴の火山と衝撃の起源を区別する.
高原を形成した堆積と堆積後のプロセスを理解する.

主な方法:

岩層の質感分析. 岩層の質感分析. 岩層の質感分析. 岩層の質感分析.
岩の組成の地球化学的調査.
爆発的な火山と衝突クレーター形成モデルの比較分析.

主要な成果:

ホーム・プレートの下部には,爆発物発生時の位置を示すテクスチャが描かれています.
地化学的なデータは,衝撃の起源よりも爆発的な火山の起源を強く支持しています.
上部ユニットは,下部ユニットと同じピロクラスティック源から派生したエオリアン (風で再処理された) 材料であるようです.

結論:

ホームプレート高原は,火星の爆発的な火山活動の産物として解釈されています.
層層の構造は,初期の熱弾性堆積を反映し,その後はエオリアの改変が続きます.
この発見は,火星の火山と大気の歴史を理解するのに役立ちます.

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