大气中的二氧化碳活跃转化为甲在Samail Ophiolite (阿曼) 的矿中
Daniel B Nothaft1,2, Alexis S Templeton3, Peter B Kelemen4
1Department of Geological Sciences, University of Colorado, Boulder, CO, USA. daniel.nothaft@colorado.edu.
Scientific reports
|January 19, 2026
概括
蛇形化石中甲的形成速度惊人地快. 微生物甲生物利用富含的液体和大气中的二氧化碳在上个世纪生产年轻甲.
科学领域:
- 地质化学 地质化学
- 微生物学 微生物学
- 环境科学 环境科学
背景情况:
- 甲 (CH4) 普遍存在于低温水化矿的液体中,但其起源,形成速度和机制尚不清楚.
- 之前对矿石的研究主要确定了来自自然漏的非生物",老"甲.
研究的目的:
- 调查来自阿曼萨迈尔奥菲奥利特 (Samail Ophiolite) 地下液体中甲形成的来源,速度和机制.
- 为了区分微生物和非生物甲生产途径在蛇形化矿环境.
主要方法:
- 从四个井 (深度高达400米) 的地下水样本中分析溶解的甲 (CH4).
- 溶解的碳化合物的放射性碳 (14C) 和稳定同位素 (13C,2H) 分析.
- 水地化学和微生物学数据的整合.
主要成果:
- 观察到溶解甲中14C含量的范围广泛,从放射性碳死亡到现代.
- 鉴定了"年轻"微生物甲,由富含H2的液体中的甲原体产生的,与较老的,可能是非生物甲和C2+基一起.
- 放射性碳数据表明,在温度<60°C时,大气中的二氧化碳 (在上个世纪内) 迅速转化为甲.
结论:
- 微生物甲生成是这些蛇形化矿地下水中年轻甲的重要来源.
- 这项研究揭示了局部甲形成和大气二氧化碳利用在地下环境中的惊人的快速速度.
- 这些发现挑战了先前对ophiolites中甲起源的解释,强调了微生物过程和快速碳循环的重要性.
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