サブダクション炭素
Terry Plank1, Craig E Manning2
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA. tplank@ldeo.columbia.edu.
Nature
|October 18, 2019
まとめ
地球には隠された炭素循環があり 毎年メガトンの炭素が 沈殿地に入ります このプロセスは大気中の二酸化炭素と酸素のレベルに影響を与え 地質史に影響を与えます
科学分野:
- 地化学
- 地球科学
- 火山学
背景:
- 毎年相当量の炭素が 地球の潜水地帯に入ります
- この吸収された炭素は大気組成と地球の長期の炭素バランスに影響を与えます
- 吸収された炭素の運命を理解することは,地球生物化学のサイクルを理解するために不可欠です.
研究 の 目的:
- サブダクションゾーン内の炭素の移動と変換を制御するプロセスを解明する.
- 弧火山から放出される二酸化炭素の源と再利用メカニズムを調査する.
- カーボンインプットとリモビライゼーションのグローバル変動をコンバージェントマージンで分析する.
主な方法:
- 潜水地帯への炭素輸送に関与する地質学的過程の検討
- 沈殿した炭素を流体,マグマ,火山ガス,ダイヤモンドに変換する分析.
- 火山ガスの組成と潜水物質との関係を調べる.
主要な成果:
- 炭素は微化石,有機物,炭酸沈殿物を通して 沈殿地に入ります
- 火山による二酸化炭素の排出は主にリサイクルされた沈殿物から発生する.
- 炭素の変換と放出は,世界各地のサブデュークションゾーンによって大きく異なります.
結論:
- 潜水地帯は地球内の 隠された炭素循環の 重要な経路として機能します
- 吸収された炭素のリサイクルは,地球の歴史を通じて大気中のCO2とO2レベルに大きな影響を与えています.
- コンバージェント・マージンは,複雑な潜水炭素循環を研究するための天然の実験室として機能する.
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