ピライトの深層無生物気象化
Xin Gu1, Peter J Heaney2, Fabio D A Aarão Reis3
1Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, USA. xug102@psu.edu.
まとめ
ピライトの酸化は酸素の拡散,侵食,破裂によって制御されます. 微生物によってではありません. これらの要因は,ピライトの気象を制限し,地球に影響を与えます.
科学分野:
- 地化学
- 環境科学
- ミネラロジー
背景:
- ピライト (硫化鉄) は,酸素による酸化に敏感な一般的な鉱物です.
- 地球の初期の大気は酸素に富んだので ピライトは堆積物の中で希少でした
- 最も多い表面の岩石であるシェイルは,気象学の研究の重要な場所です.
研究 の 目的:
- シェール気象によるピライト酸化を制御する要因を決定する.
- ナノメートルからメートルまでの複数のスケールで ピライトの気象を分析します
- 微生物が地球上のピライトを 破壊する役割を評価する.
主な方法:
- シェイルの気象化 (10^9から10^2メートル) の複数のスケール分析
- ミネラル反応の研究のための化学分析.
- 物理的な構造とプロセスを調べるための顕微鏡分析.
主要な成果:
- 現在の大気条件下でのピライトの酸化は,鉱物表面への酸素拡散によって制限されます.
- 大規模な侵食とクラストスケールの破裂は重要な規制要因です.
- 鉄や硫黄の微生物による酸化は,地球規模のピライト気象流を制御しない.
結論:
- ピライトの反応性は 主に酸素の供給とともに 破裂や侵食などの物理的プロセスによって制御されます
- 地球のピライト気象の歴史を理解するには 多次元視野が不可欠です
- 微生物の触媒は世界のピライトの耐候速度を決定しません.
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