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Simultaneous δ2 H and δ18 O analyses of water inclusions in halite with off-axis integrated cavity output spectroscopy.
Journal of Mass Spectrometry ( IF 2.3 ) Pub Date : 2020-07-17 , DOI: 10.1002/jms.4615
François Fourel 1 , Christophe Lécuyer 2 , Patrick Jame 3 , Alexandre Guironnet 3 , Antoine Boutier 2 , Manon Barbier 3 , Nigel Blamey 4 , Uwe Brand 5 , Philip Fralick 6
Affiliation  

Stable isotope compositions of ancient halite fluid inclusions have been recognized to be valuable tools for reconstructing past environments. Nevertheless, in order to better understand the genesis of halite deposits, it could be of great interest to combine both δ2H and δ18O measurements of the water trapped as inclusions in the defects of the mineral lattice. We developed a method combining off‐axis integrated cavity output spectroscopy (OA‐ICOS) connected on line with a modified elemental analyzer (EA‐OA‐ICOS) to perform those measurements. The first step was to test the method with synthetic halite crystals precipitated in the laboratory from isotopically calibrated waters. Water isotopic signatures have been measured with conventional techniques, equilibration for δ18O and chromium reduction for δ2H. Then, we modified and optimized a conventional EA to connect it online with an OA‐ICOS instrument for H2O measurements. The technique is first evaluated for calibrated free water samples. The technique is also evaluated for salt matrix effect, accuracy, and linearity for both isotopic signatures. Then, the technique is used to measure simultaneously δ2H and δ18O values of halite water inclusions precipitated from the evaporation experiments. Data generated with this new technique appeared to be comparable with those inferred from prior off‐line technique studies. The advantages offered by the OA‐ICOS technique are the simultaneous acquisition of both isotopic ratios and the substantial reduction of data acquisition time and sample aliquot size. Natural halite samples have been analyzed with this method. Natural halite samples as old as Precambrian have also been analyzed with this method.

中文翻译:

利用离轴集成腔输出光谱仪同时分析盐岩中水夹杂物的δ2H和δ18O。

古代岩盐流体包裹体的稳定同位素组成已被认为是重建过去环境的宝贵工具。然而,为了更好地了解岩盐矿床成因,也可能是极大的兴趣,这两个结合δ 2 H和δ 18个Ø测量被困在矿物晶格的缺陷夹杂物的水。我们开发了一种将离轴集成腔输出光谱(OA-ICOS)与改进的元素分析仪(EA-OA-ICOS)在线连接的方法进行测量。第一步是用在实验室中从同位素校准过的水中沉淀出的合成盐岩晶体测试该方法。水的同位素特征已通过常规技术进行了测量,以平衡δ18为δO和铬还原2 H.然后,我们修改和优化现有的EA将其与OA-ICOS仪器用于h在线连接2 ö测量。首先对校准后的自由水样品进行评估。还评估了该技术的盐同位素效应,两种同位素特征的准确性和线性。然后,该技术被用于同时测量δ 2 H和δ 18从蒸发实验中沉淀出的盐分水夹杂物的O值。用这项新技术生成的数据似乎与以前的离线技术研究得出的数据相当。OA‐ICOS技术提供的优势是同时获取同位素比率,并大大减少了数据获取时间和样品等分试样的大小。用这种方法分析了天然盐岩样品。还使用这种方法分析了早于寒武纪的天然盐岩样品。
更新日期:2020-09-03
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