アルゴンの同位体成分 アーケアの大気 初期の地球の地動力学を調査する
Magali Pujol1, Bernard Marty, Ray Burgess
1CRPG-CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, 54501 Vandoeuvre-lès-Nancy Cedex, France.
Nature
|June 7, 2013
まとめ
科学者たちは,古代の水熱カルツを分析して,アルカイア時代の大気中のアルゴンを測定しました. 低アルゴンイソトープ比は,初期のフェルシック地殻の発達を示唆し,初期の地球に影響を与える可能性がある.
科学分野:
- 地球科学 地球科学 地球科学
- 地質化学 地質化学
- 同位体地質学とは,同位体地質学である.
背景:
- 大陸地殻の成長を理解することは,地球科学の鍵です.
- 地球の貯蔵庫にある高貴ガスの同位体は,地化学的進化の洞察を提供している.
- 過去の大気組成と地殻マントルの交換レートは,サンプルの制限のため,ほとんど制約されません.
研究 の 目的:
- 古代水熱クォーツのアルゴン組成を分析するために.
- アルカイア大気圏の同位体シグネチャーを再構築するために.
- 地球の歴史における地殻の初期の発展の役割を調査する.
主な方法:
- 35億年前の水熱クォーツの流体インクルージョン内のアルゴンイソトープの分析.
- 閉じ込められたアルカイア流体における (40) Ar/ (36) Ar比の測定.
主要な成果:
- 特定されたアケア時代の大気アルゴンで (40) Ar/(36) Ar値は143 ± 24.
- この比率は,298.6.6の現在の価値より大幅に低い.
- 発見は,フェルシックの地殻の早期発達を示しています.
結論:
- 低アルカイア (40) Ar / (36) Ar比は,初期のフェルシックの地殻形成をサポートしています.
- 初期の大陸の地殻は,地球の初期の歴史における気候の変動に決定的な役割を果たした可能性がある.
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