酸素 の 同位体 の 集合 は,地球 の 海水,気温,炭素 循環 の 歴史 を 明らかに し て い ます
1Te Aka Mātuatua, University of Waikato (Tauranga), Bay of Plenty, Tauranga, New Zealand.
Science (New York, N.Y.)
|February 8, 2024
まとめ
地球
科学分野:
- 地化学と古気候学:地球の長期の居住可能性と気候の動態を調査する.
背景:
- 古代から地球の持続的な居住可能性はよく理解されていません.
- 過去の解釈は,新しい発見と対照的に, 熱い初期の地球を示唆しています.
研究 の 目的:
- 海水の酸素同位体 (δ18O),温度,粘土の豊富さを再構築する.
- 地球の長期の気候の安定性と居住性を制御する要因を調査する.
主な方法:
- シェール,鉄酸化物,炭酸,シリカ,およびリン酸記録を使用した酸素同位体アンサンブルアプローチを使用した.
- プレカンブリア時代の沈殿物を分析し,オートジニック粘土の含有量と気候変化との関係を調べた.
主要な成果:
- 熱い初期の地球仮説に異議を唱える,海水の上昇 δ18Oと温和なプロテロゾイク気候を明らかにした.
- 大規模な気候変動と相関する海洋と陸上の粘土の豊富な変化を特定しました.
- 粘土形成の変化が海水の18O濃縮と気候の安定に影響を与えたことを実証した.
結論:
- 地球の気候システムは,温和なプロテロゾイク気候で強くバッファリングされています.
- 粘土の形成の変化に起因する逆気象は,気候の安定と初期の地球の状態を維持する上で重要な役割を果たした.
- 粘土の豊富な変化は,冷却のイベント,シリコンの生命の進化,および植物放射線と関連しています.
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