硫微环境作为生物质矿形成的热点
Fatih Sekerci1, Stefan Fischer2, Prachi Joshi1
1Geomicrobiology, Department of Geosciences, University of Tuebingen, Tuebingen, Germany.
Scientific reports
|June 20, 2025
概括
元素硫和减少硫的细菌促进了酸盐的形成. 硫颗粒起到热点的作用,为生物 Pyrite 沉创造富含多硫化物环境.
科学领域:
- 地质化学 地质化学
- 微生物学 微生物学
- 矿物学是什么?矿物学是什么?
背景情况:
- 矿 (FeS2) 是沉积环境中的一个关键矿物质,通常由硫酸盐减少细菌 (SRB) 形成.
- 在以前的研究中,在使用SRB用于生物质矿形成时,通常会产生转移稳定的硫化铁 (例如,麦卡诺石).
- 在微生物化合成中元素硫的作用仍然不太清楚.
研究的目的:
- 研究元素硫 (S0) 和微生物硫还原对矿形成的影响.
- 探索减少硫的细菌的潜力,作为SRB的替代品,用于生物 Pyrite合成.
- 了解有利于矿沉的微环境条件.
主要方法:
- 用不同Fe/S比率 (4:1和1:4) 的铁和元素硫培养Geobacter sulfurreducens.
- 在不同条件下形成的矿产产品的分析.
- 在元素硫的表面上对化物形成的形态检查.
主要成果:
- 麦基纳岩 (FeS) 在高Fe/S比率 (4:1) 形成.
- 灰矿 (Fe3S4) 和矿 (FeS2) 通过聚硫化物通路以低Fe/S比率 (1:4) 形成.
- 球状矿颗粒在元素硫的表面上形成核并生长,从而保留了硫的形态.
结论:
- 减少硫的细菌可以作为硫化物来源来形成矿,补充或取代SRB.
- 基本的硫颗粒作为生物 Pyrite 形成的关键热点.
- 富含多硫化物的微环境和硫颗粒的模板效应推动了异质的矿沉.
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