ネオアルケアンの炭酸塩関連硫酸塩は,陽性 Δ33S 異常を記録しています
G Paris1, J F Adkins2, A L Sessions2
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. gparis@caltech.edu.
まとめ
ネオアルケアンの炭酸塩の硫黄同位体分析は,予期せぬ陽性質量独立分化 (Δ(33) S) 信号を明らかにし,初期の地球の大気と硫酸塩組成に関する以前の仮定に異議を唱える.
科学分野:
- 地質化学 地質化学
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 初期の地球の条件.
背景:
- 古代の岩石の硫黄同位素 (Δ(33) S) は,初期の大気組成と酸素化の出来事を伝える.
- 仮説は,アーケイア海水硫酸塩の負のΔ(33) Sを予測しているが,これはアーケイアイオンのほとんどについて,ほとんど未検証のままである.
研究 の 目的:
- ネオアルケアンの炭酸塩の Δ(33) S シグネチャーを調査するために.
- 古代の海水硫酸塩に均等に負の Δ(33) S が存在するという説を検証する.
主な方法:
- ネオアルケアンの炭酸塩の低硫酸塩含有量を分析するためのX線吸収スペクトロスコーピー.
- 硫黄同位素 (Δ(33) S) のサインを測定するための質量スペクトロメトリ.
主要な成果:
- 予期せぬ,大きく,広く広がった陽性 Δ(33) S 値は,ネオアルカインの炭酸塩で検出されました.
- これらの発見は7000万年以上にわたり,多様な堆積環境をカバーしています.
- 硫酸塩の記録は,大気中の硫黄の質量に依存しない分割による予想される負の Δ(33) S を示していません.
結論:
- 古代の海水硫酸塩は,予測された負の Δ(33) S 信号を一貫して持たない.
- これは,ネオアルケアンイオンにおける硫黄循環と大気組成に関する既存のモデルに異議を唱える.
- 地球の初期の大気中の硫黄質量独立の分割過程の再評価は正当化されています.
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