利用共焦拉曼光谱对方解石流体包裹体中的碳酸盐物种浓度、pH 值和 pCO2 进行原位定量。

IF 2.2 3区 化学 Q2 INSTRUMENTS & INSTRUMENTATION Applied Spectroscopy Pub Date : 2024-10-01 Epub Date: 2024-09-05 DOI:10.1177/00037028241275192
Michael Naylor Hudgins, Todd K Knobbe, Julia Hubbard, Andrew Steele, Justin G Park, Morgan F Schaller
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引用次数: 0

摘要

碳酸盐矿物遍布现代和远古地球,在陆地和海洋沉积环境中含量丰富。方解石包裹体保留了矿物形成时源流体地球化学的主要特征(即 pCO2),可用于重建古环境。共焦激光拉曼光谱提供了一种快速、无损的方法来测量碳酸盐岩中流体包裹体的成分,是定性确定水相和气相成分的可靠方法。在此,我们展示了一种利用共焦拉曼光谱准确量化方解石流体包裹体中碳酸氢根离子和碳酸根离子浓度(低至 20 mM)和 pH 值(7-11)的方法。使用储备溶液对碳酸盐(CO32-)和碳酸氢盐(HCO3-)浓度和 pH 值进行了仪器校准。我们的研究表明,方解石主矿物不会影响碳酸盐溶液浓度的精确定量,这些参数可用于估算流体包裹体中溶液的 pH 值和 pCO2。我们将该技术应用于冰岛麻粒方解石,发现[CO32-] = 0.11,[HCO3-] = 0.17,pH = 10.1,二氧化碳的百万分之一 = 2217。CO2、CH4 和 H2S 气体拉曼带的存在表明,该矿物是在还原环境中沉淀的。
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In Situ Quantification of Carbonate Species Concentrations, pH, and pCO2 in Calcite Fluid Inclusions Using Confocal Raman Spectroscopy.

Carbonate minerals are globally distributed on the modern and ancient Earth and are abundant in terrestrial and marine depositional environments. Fluid inclusions hosted by calcite retain primary signatures of the source fluid geochemistry at the time of mineral formation (i.e., pCO2) and can be used to reconstruct paleoenvironments. Confocal laser Raman spectroscopy provides a quick, nondestructive approach to measuring the constituents of fluid inclusions in carbonates and is a reliable method for qualitatively determining composition in both the aqueous and gas phases. Here, we demonstrate a method for accurately quantifying bicarbonate and carbonate ion concentrations (down to 20 mM) and pH (7-11) from calcite fluid inclusions using confocal Raman spectroscopy. Instrument calibrations for carbonate (CO32-) and bicarbonate (HCO3-) concentrations and pH were performed using stock solutions. We show that the calcite host mineral does not affect the accurate quantification of carbonate solution concentrations and that these parameters can be used to estimate the pH and pCO2 of a solution entrapped within a fluid inclusion. We apply the technique to Icelandic spar calcite and find a [CO32-] = 0.11, [HCO3-] = 0.17, pH = 10.1, and CO2 parts per million = 2217. The presence of gaseous Raman bands for CO2, CH4, and H2S suggests that the mineral precipitated in a reducing environment.

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来源期刊
Applied Spectroscopy
Applied Spectroscopy 工程技术-光谱学
CiteScore
6.60
自引率
5.70%
发文量
139
审稿时长
3.5 months
期刊介绍: Applied Spectroscopy is one of the world''s leading spectroscopy journals, publishing high-quality peer-reviewed articles, both fundamental and applied, covering all aspects of spectroscopy. Established in 1951, the journal is owned by the Society for Applied Spectroscopy and is published monthly. The journal is dedicated to fulfilling the mission of the Society to “…advance and disseminate knowledge and information concerning the art and science of spectroscopy and other allied sciences.”
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