セレスの表面におけるフィロシリケートの分布

E Ammannito¹, M C DeSanctis², M Ciarniello²

¹Earth Planetary and Space Sciences, University of California-Los Angeles, 603 Charles Young Drive, Los Angeles, CA 90095-1567, USA. eleonora.ammannito@igpp.ucla.edu.

Science (New York, N.Y.)

|October 5, 2016

まとめ

フィロシリケート鉱物は,小惑星セレスに広く存在し,広範な内部変化プロセスを示しています. これらのマグネシウムとアンモニウムを含んだ鉱物は固有の地質学的活動によって形成されたことを示唆しています

科学分野:

惑星科学
ミネラロジー
天文地質学

背景:

矮星セレスは表面にフィロシリケート鉱物があることが知られています.
これらの鉱物の分布と起源は不明のままです.
鉱物学を理解することは天体の地質史を解読する鍵です

研究の目的:

セレス上のフィロシリケートの空間分布をマッピングする.
この地表鉱物の起源を特定するためです
セレスのフィロシリケートの組成と変動性を分析する.

主な方法:

ドーン号のスペクトロメーターを使って
可視と近赤外線スペクトルの診断吸収特性を用いて鉱物の分布をマッピングした (0.25×5.0ミクロメートル).
分析したスペクトル特性から鉱物の成分と豊富さを推測した.

主要な成果:

マグネシウムとアンモニウムを含有するフィロシリケートはセレスの表面に至る所に存在します.
吸収特性の強さの変動は,フィロシリケートの相対的豊富さの有意な違いを示しています.
鉱物成分は,豊富さの変動にもかかわらず,ほとんど均一です.
セレスのスペクトルの性質は,他の小惑星や炭酸性隕石と異なる.

結論:

セレスのフィロシリケートは内在的に形成された.
世界的に広範囲に広がる広範な変異プロセスが形成の原因である.
これらの発見は矮惑星の地質学的進化の洞察を与えてくれます

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