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高度な siderophile 要素は,地球・月系の増殖と分化に制約を与える
James M D Day1, D Graham Pearson, Lawrence A Taylor
1Department of Earth and Planetary Science, University of Tennessee, Knoxville, TN 37996, USA. jday13@utk.edu
Science (New York, N.Y.)
|January 16, 2007
まとめ
新しいデータは,月が月であることを明らかにしています.
科学分野:
- 地質化学 地質化学
- 惑星科学は惑星科学である.
- 宇宙化学 (コスモケミストリー)
背景:
- 高度 siderophile 要素 (HSEs) は,惑星の形成と進化の洞察を提供します.
- 月のマントルの組成を理解することは,その起源と歴史を解読するために不可欠です.
- 以前の研究では,地球と月の間でHSEの豊富さの違いが示唆されていました.
研究 の 目的:
- 月面の玄武岩について,レニウム・オスミウムとプラチナ群の元素を組み合わせた新しいデータセットを提示する.
- 月のマントルの高度 siderophile 要素 (HSE) の組成を調査する.
- 月のマントルの形成過程と地球の形成過程を比較するために.
主な方法:
- 月の玄武岩サンプルにおけるレニウム・オスミウムとプラチナ群の元素の分析.
- 総合的な分析のために,統合された地化学データセットを使用します.
- シリケート金属の均衡と後期増殖過程のモデリング.
主要な成果:
- 月面の玄武岩は,高サイドロフィール元素 (HSEs) の均等に低い豊富さを表しています.
- 月のマントルは,長期にわたる,コンドリティックなHSE比率を有しているが,絶対的豊富さは地球の約20倍低い.
- 月面の遅い蓄積は,組成的には地球のそれと似ているが,体積が小さく,より早く終了した.
結論:
- 月面と地球のマントルの形成には,巨大衝突,核形成,後期増殖の同様のプロセスが含まれていました.
- HSEの豊富さの差異は,後期増殖の体積と持続時間の変動に起因する.
- 月のマントルは,地球と比較して,後期的な物質添加が少ない.
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