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碳酸盐物种度,pH和pCO2在石液体含量中使用聚焦拉曼光谱学进行实地定量
Michael Naylor Hudgins1,2,3, Todd K Knobbe1, Julia Hubbard1
1Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Jonsson Rowland Science Center, Troy, New York, USA.
Applied spectroscopy
|September 6, 2024
概括
这项研究引入了一种使用共聚焦拉曼光谱的新方法,以精确测量碳酸盐和二碳酸盐离子度以及石中的液体含量内的pH值. 这种技术允许详细重建古代的地化学条件和古生物学环境.
科学领域:
- 地质化学 地质化学
- 矿物学是什么?矿物学是什么?
- 频谱学是一种光谱学.
背景情况:
- 碳酸盐矿物广泛存在,并保留了包括在内的液态地化学.
- 液体包含提供了对过去pCO2和古环境的洞察力.
- 同焦激光拉曼光谱法是一种分析液体内含物的非破坏性方法.
研究的目的:
- 开发和验证一种定量方法,用于分析石中的液体含量.
- 使用共聚焦拉曼光谱测量碳酸盐 (CO3^2-) 和碳酸盐 (HCO3^-) 离子度和pH值.
- 将这种方法应用于古环境重建.
主要方法:
- 校准的共聚焦激光拉曼光谱使用库存溶液.
- 量化碳酸盐和二碳酸盐离子度和pH值在石灰岩液体内含.
- 分析了冰岛石石样本.
主要成果:
- 精确量化碳酸盐和二碳酸盐度至20mM,pH从7-11之间.
- 证明石宿主矿物质不会干扰测量.
- 在冰岛中测量了特定度 ([CO3^2-]=0.11,[HCO3^-]=0.17,pH=10.1) 和二氧化碳 (2217 ppm).
- 确定了CO2,CH4和H2S,表明减少环境.
结论:
- 聚焦拉曼光谱法提供了一种可靠的方法,用于量化石流体含中的关键地质化学参数.
- 这种技术提高了重建过去pCO2和pH的能力.
- 这些发现表明,冰岛在减少环境中沉.
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