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An isotope ratio mass spectrometry‐based method for hydrogen isotopic analysis in sub‐microliter volumes of water: Application for multi‐isotope investigations of gases extracted from fluid inclusions
Author(s) -
Buikin Alexei Ivanovich,
Kuznetsova Olga Vitalievna,
Velivetskaya Tatiana Alexeevna,
Sevastyanov Vyacheslav Sergeevich,
Ignatiev Alexander Vasilievich
Publication year - 2020
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.8923
Subject(s) - chemistry , isotope ratio mass spectrometry , fluid inclusions , isotope , isotope analysis , mass spectrometry , sorption , stable isotope ratio , isotopes of oxygen , quartz , hydrogen , analytical chemistry (journal) , adsorption , mineralogy , chromatography , geology , nuclear chemistry , paleontology , physics , oceanography , organic chemistry , quantum mechanics
Rationale The study of multi‐isotope systematics of fluid inclusions is of great importance for understanding of the sources and evolution of fluid phases in mantle rocks and ore deposits. The most appropriate technique for such investigations is a (stepwise) crushing method that is widely used for noble gases and nitrogen. However, because of the possible influence of mechanochemical reactions and back sorption, analyses of the isotope composition of water extracted by crushing from fluid inclusions are challenging. Methods An isotope ratio mass spectrometry (IRMS)‐based method for hydrogen (and oxygen) isotopic analysis in sub‐microliter volumes of water extracted from fluid inclusions by crushing is presented. The verification of the possible influence of adsorption processes and mechanochemical reactions on the results of isotope analysis was performed for the first time. For that a series of parallel analyses of hydrogen isotopic ratios from water inclusions in quartz applying physically different extraction methods (crushing and thermodecrepitation) was conducted. Results Four series of quartz aliquots were analyzed: three series extracting water by crushing (two series for δ 2 H values and one for δ 18 O values) and one by thermodecrepitation. The mean value for the crushing results is δ 2 H = − 85.3 ± 3.6 ‰ (1σ, n = 11), which coincides well with the thermodecrepitation data (−86.3 ± 2.0 ‰, 1σ, n = 5), suggesting that our methodological approach allows the influence of back sorption or mechanochemical reactions during the crushing experiment to be minimized. The reproducibility of the oxygen isotopic ratios is ±0.9 ‰ (1σ, n = 5). Conclusions The conducted experiments have shown that the influence of back sorption or mechanochemical reactions during crushing on isotopic results is not crucial for our method. The developed IRMS‐based method for hydrogen (and oxygen) isotopic analysis in sub‐microliter volumes of water is well applicable for multi‐isotope investigations of gases extracted from fluid inclusions. As an application a well‐defined 40 Ar/ 36 Ar–δ 2 H correlation in mantle rocks is presented for the first time.