月の後期積層の歴史を再構成する
Meng-Hua Zhu1,2, Natalia Artemieva3,4,5, Alessandro Morbidelli6
1State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa, Macau, China. mhzhu@must.edu.mo.
Nature
|July 12, 2019
まとめ
月は,より低いインパクター保持比率と遅い HSE 蓄積により,地球よりもはるかに少ない高度 siderophile 要素 (HSEs) を保持した. これは月が後期に蓄積した質量に欠けていることを説明する.
科学分野:
- 惑星科学
- 地化学
- 衝突クレーター
背景:
- 惑星の形成を理解するために極めて重要な要素である.
- 地球と月の間のHSE予算には大きな違いがあります.
- 過去のモデルでは 月のインパクター保持比率が高いと仮定されていました
研究 の 目的:
- 月のインパクター保持比率を測定する
- 月の地殻とマントルで観測されたHSEの不足を説明するために.
- 月の増殖と 惑星の進化の遅い段階のモデルを 精査する
主な方法:
- 衝撃器の保持比率を決定する衝撃シミュレーションを実行した.
- モンテカルロの手順で 衝撃の流れが衰退する
- 月の地殻とマントルの時間とともに蓄積された質量.
主要な成果:
- 月面の平均インパクター保持比率は 推定値より3倍低い.
- 月面のマグマの海が固まった後 約43億5千万年前に始まったと考えられます
- この時期以前に増えた質量は,月の核にHSEを失いました.
結論:
- 低インパクター保持比率とHSEの遅い増殖は,月のHSE赤字を説明します.
- この発見は月と地球のHSE予算を 調和させています
- 月の増積史のより現実的なモデルを提供している.
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