鉄とマンガンにより強化された有機炭素の長期保存

Oliver W Moore¹, Lisa Curti², Clare Woulds³

¹School of Earth and Environment, University of Leeds, Leeds, UK. o.moore@leeds.ac.uk.

Nature

|August 2, 2023

まとめ

鉄とマンガンはマヤラード反応を触媒化し,海洋環境における堆積物有機炭素の保存を強化する. このプロセスは地球規模の炭素サイクルと地質学的時間尺度に大きな影響を与える.

科学分野:

地化学
海洋科学
有機地化学

背景:

堆積した有機炭素 (OC) の保存は,地球規模の炭素と酸素の循環にとって極めて重要です.
海洋堆積物の保存を促すメカニズムは完全に理解されていません.
メイラード反応は有機分子をジオポリマー化しますが,海洋温度では速度が遅いです.

研究の目的:

海洋の沈殿体温でメヤラード反応を触媒化する鉄とマンガンの役割を調査する.
この触媒反応が海洋沈殿物の保存に与える影響を定量化する.
鉄とマンガンの影響が地質学的な時間における世界のOC保存に及ぼす影響を評価する.

主な方法:

メイラード反応の運動を研究するインキュベーション実験.
反応産物の化学的特徴の分析
OC保存率を推定するための孔水モデリング.

主要な成果:

鉄とマンガンのイオンとミネラルは,関連する温度でマイラード反応を2度までアビオティックに触媒化する.
反応産物の化学的シグネチャーは,大陸縁の堆積物における溶解と総OCと一致する.
海洋堆積物におけるこの経路による約4. 1Tg C yr-1の保存

結論:

鉄とマンガンで触媒化されたメイラード反応は,海洋堆積物におけるOC保存を著しく強化する.
この非生物的過程は,地球上の堆積した有機炭素の埋葬に大きく貢献しています.
海洋の鉄とマンガンの入力の変動は,長期にわたる世界のOC保存に,まだ未知の大きな影響を及ぼす可能性があります.

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