小惑星4ヴェスタの深い地殻-マントルの境界

Harold Clenet¹, Martin Jutzi², Jean-Alix Barrat³

¹EPSL, Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.

Nature

|July 18, 2014

まとめ

小惑星ヴェスタ (Vesta)

科学分野:

惑星科学は惑星科学である.
小惑星研究研究.
地質物理学地質物理学とは地質物理学です.

背景:

小惑星4 Vestaは,南極の近くで2つの大きな衝突クレーターを示しています.
これらのクレーターは,地表下の物質を暴露し,ヴェスタの内部構造の洞察を提供します.
以前のモデリングは,ヴェスタの半球における表面物質の異なる深さを示していた.

研究の目的:

小惑星4 Vesta.からのデータを分析するために.
ベスタの地殻マントル境界 (Moho) の深さを決定する.
ヴェスタの外層の組成を調べるために.

主な方法:

小惑星4 Vesta.からのインパクトクレーターデータの分析.
地下物質の曝露のモデリング.
ヴェスタの構造の地球物理学的解釈.

主要な成果:

ヴェスタの北半球の表面物質は, ~20 kmの深さから発生します.
露出した南部の材料は60~100kmの深さから発生しています.
有意なオリビンの欠如は,外側の ~ 100 km が主に火性の地殻であることを示唆しています.

結論:

小惑星4 Vestaの地殻-マントル境界 (Moho) は80 kmより深い.
ヴェスタの外層は主に火性の地殻で構成されています.
衝突イベントは,小惑星の内部を理解するための重要なデータを提供します.

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