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月面での長期にわたるクリープ・マグマティズムは,月面の岩石で発見された最も若い日付の岩石によって示されている
Lars E Borg1, Charles K Shearer, Yemane Asmerom
1Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA. lborg@unm.edu
Nature
|November 13, 2004
まとめ
新しい分析により,月のカリウム,希土元素,そしてリン (KREEP) のマグマティズムが,さらに10億年続いたことが明らかになった. この発見は,日付を付けられた最も若い月面のサンプルに基づいていて,月面の地質学的歴史に関する私たちの理解を広げています.
科学分野:
- 月面地質学 月面地質学
- 惑星科学は惑星科学である.
- ペトロロジー・ペトロロジーとは
背景:
- 月の組成の多様性は,そのマグマの海の原始的固化と融解から生じた.
- 初期の月の岩はオリビンとピロキセンが豊富で,その後はプラジオクラゼが豊富な岩であった.
- カリウム,希土元素,およびリン (KREEP) の材料は,マグマの海の最終結晶化段階で形成されました.
研究 の 目的:
- 月面でのKREEPマグマティズムの期間と範囲を調査する.
- 最近の月のマグマ活動にKREEPが関与していたかどうかを判断するために.
- KREEPの証拠のために最も若い日付の月のサンプルを分析するために.
主な方法:
- 最新の月面サンプルを分析した.
- 月面サンプルの地化学および時間分析.
- 放射線年代測定法 放射線年代測定法
主要な成果:
- 証拠によると,KREEPのマグマティズムは,以前に確立されたタイムラインを超えて,さらに10億年延長された.
- 最も若い日付の月面サンプルには,KREEPマグマティズムの特徴が示されています.
- これは,月面でのKREEP関連の地質学的活動の既知の期間を延長します.
結論:
- クリープ・マグマチズムは,これまで考えられていたよりも長い期間活動していた.
- この発見は,月面の熱進化とマグマティズムに関する既存のモデルに異議を唱えている.
- この延長されたマグマの活動は,月の内部熱源と地質学的進化を理解するための意味を持っています.
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