在新喀里多尼亚的ophiolite中进行四次低温蛇形化和碳化
Marianna Corre1, Fabrice Brunet2, Stéphane Schwartz1
1ISTerre, Université Grenoble Alpes, USMB, CNRS, IRD, 38041, Grenoble, France.
Scientific reports
|November 8, 2023
概括
流星水对ophiolites的低温变化驱动矿物碳化,去除大气中的CO2. 这一过程通过蛇形化反应产生和甲,新喀里多尼亚的风脉矿化证明了这一点.
科学领域:
- 地质化学 地质化学
- 矿物学是什么?矿物学是什么?
- 环境科学 环境科学
背景情况:
- 岩石经历低温变化 (<150°C) 的流星水,导致通过矿物碳化去除大气中的二氧化碳.
- 假设ophiolites内部的蛇形化反应产生 (H2) 和甲 (CH4).
- 在ophiolites中性泉的化学成分为这些改变过程提供了洞察力.
研究的目的:
- 为了研究新喀里多尼亚ophiolite中反应性水透的矿物学和地化学指纹.
- 分析与低温变化和蛇形化相关的碳和同位素特征.
- 了解南方高原地区古老的性泉源的管道系统.
主要方法:
- 在新喀里多尼亚ophiolite (Massif du Sud) 的风口矿化分析.
- 矿物水平衡的热化学模拟.
- 对多洛米特的稳定同位素分析 (δ13C).
主要成果:
- 确定了年轻的 (<2万年) 静脉矿化 (石,多洛石,磁石 ± 铁石) 在~95°C形成.
- 热化学模拟证实透的液体是性且含有H2的.
- 多洛米特中异常高的δ13C值 (7.117.3‰) 表明了低温的甲基生成.
结论:
- 研究的片代表了地下管道系统的保存样本,供应四年级性泉源.
- 证实了流星水对ophiolite的改变是大气二氧化碳的重要沉积点,也是H2和CH4.4的来源.
- 提供了直接证据,表明低温甲生成与化有关,在化环境中.
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