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TC/EA-MS online determination of hydrogen isotope composition and water concentration in eclogitic garnet

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Abstract

A continuous flow method, by a combination of thermal conversion elemental analyzer (TC/EA) with isotope ratio mass spectrometry (MS), is presented for determination of both H isotope composition and H2O concentration of garnet from eclogite. Together with biotite NBS-30, the garnet was tested by preheating mineral grains at different temperatures. Preheating at 90°C for 12 h was found to be capable of eliminating adsorption water on sample surface. This results in constant δD values and total H2O contents for the garnet, with weighted means of −93 ± 2‰ and 522 ± 11 ppm (wt), respectively. The garnet that was preheated at 350°C for 4 h also gave constant δD values of −86 ± 6‰ and H2O contents of 281 ± 13 ppm (wt). The latter result for the H2O contents agrees with the H2O contents 271 ± 58 ppm (wt) measured by Fourier transform infrared spectroscopy for quantitative analysis of structural hydroxyl in the same garnet. Stepwise-heating TC/EA-MS analyses for the garnet show that the molecular H2O are depleted in D relative to the structural OH and has higher mobility than the structural OH. Therefore, the TC/EA-MS method can be used not only for quantitative determination of both H isotope composition and H2O concentration of hydrous and anhydrous minerals, but also for the concentration of structural hydroxyl after high-T dehydration.

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Acknowledgments

This study was supported by funds from the Natural Science Foundation of China (40573011) and the Chinese Academy of Sciences (kzcx2-yw-131). Thanks are due to Dr. Qunke Xia for his assistance with FTIR measurements. The manuscript has been greatly improved from comments by Tony Withers and one anonymous reviewer.

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  1. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, Hefei, 230026, China

    Bing Gong, Yong-Fei Zheng & Ren-Xu Chen

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  1. Bing Gong
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  2. Yong-Fei Zheng
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  3. Ren-Xu Chen
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Correspondence to Yong-Fei Zheng.

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Gong, B., Zheng, YF. & Chen, RX. TC/EA-MS online determination of hydrogen isotope composition and water concentration in eclogitic garnet. Phys Chem Minerals 34, 687–698 (2007). https://doi.org/10.1007/s00269-007-0184-4

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