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チャンエ5の玄武岩から月面の20億年前の火山活動
Qiu-Li Li1, Qin Zhou2, Yu Liu1
1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.
Nature
|October 19, 2021
まとめ
最新の月の玄武岩は20億3千万年前のChang'e-5ミッションで,火山を拡大しました. この正確な放射線年代測定はクレーター数を計測し,月面の玄武岩の KREEP の少ないマントルの源を明らかにします.
科学分野:
- 月の地質学と地化学
- 惑星科学
- 放射線年代測定法
背景:
- 月のマグマと熱の歴史は地上の惑星とは異なる.
- 月面の基本岩石のほとんどは28億年前に消滅した.
- 以前より若いバサルトの年齢は 不確実なクレーター数年代に基づいていました
研究 の 目的:
- チェンジ5号から戻ってきた ベースルトのクラストの正確な年代を
- この若い月の玄武岩の 違いと源の特徴を特定するために
- 月面火山の観測期間を延長し,時間表を調整する.
主な方法:
- ベースルトクラストの鉛-鉛 (Pb-Pb) 放射線年代測定
- μ値を含むウラン-鉛 (U-Pb) の同位体の比率の決定.
- 同位体データと既存の月の玄武岩データセットの比較.
主要な成果:
- 精密な結晶化年齢は2,030 ± 4百万年前にChang'e-5の玄武岩.
- これは月面の玄武岩の最も若い放射年齢を表し,火山活動を8億から9億年延長します.
- ベースルト源は μ 値が低い (約 680),KREEPが少ない成分を示しています.
結論:
- 月面の火山は,放射線年代測定で以前よりずっと遅れて存在した.
- 正確な年齢は,太陽系の内部のクレーターカウントのクロノロジーのための重要な校正ポイントを提供します.
- 発見は月の火山と熱の進化に関する新しい洞察を提供し,これらの後期ベースルトの KREEP の貧しい源を強調しています.
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