関連する実験動画
Updated: Jul 12, 2026

06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
まとめ
原始的なマントルのダイヤモンドの浮き物は高圧で融解し,移行地帯が重要なダイヤモンド貯蔵庫である可能性を示唆しています. この発見は,地球についての私たちの理解に影響を与えます.
科学分野:
- 地質化学 地質化学
- ミネラル物理学 ミネラル物理学
- 高圧実験科学 高圧実験科学
背景:
- 地球の深い内部における炭素相の振る舞いを理解することは,マントルのプロセスを解読する上で極めて重要です.
- マントル内のダイヤモンドの安定性と輸送に関する以前のモデルは,直接的な実験データによって制限されていました.
研究 の 目的:
- 高圧と高温で融解する原始的なマントルに比べてダイヤモンドの密度を実験的に決定する.
- ダイヤモンドの浮力性が地球の移行地帯に蓄積する際の影響を調査する.
主な方法:
- 高圧,高温のダイヤモンド・アンビル・セル実験.
- 合成されたマントルの溶融組成物におけるダイヤモンドの行動 (浮遊または沈没) の観察.
- 圧力および温度条件の正確な測定.
主要な成果:
- ダイヤモンドは,原始的なマントルの溶融で約20ギガパスカルと2360°Cで浮いていることが観察されました.
- ダイヤモンドはまた,約16ギガパスカルと2270°Cの移行地帯から派生した溶融の中で浮いていた.
- これらの結果は,マグマ密度に対するマントルの深い条件の直接的な制約を提供します.
結論:
- 深いマントルの溶融におけるダイヤモンドの浮力性は,移行地帯に蓄積できることを示している.
- 移行地帯は,地球の歴史の初期から,長期間,落下または閉じ込められたダイヤモンドの貯蔵庫であった可能性が高い.
- この蓄積メカニズムは,深層の炭素循環とマントルの進化に重大な影響を及ぼします.
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