caa a22 4500 463217373 CHVBK 20180405153201.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s00269-007-0184-4 doi (NATIONALLICENCE)springer-10.1007/s00269-007-0184-4 TC/EA-MS online determination of hydrogen isotope composition and water concentration in eclogitic garnet [Elektronische Daten] [Bing Gong, Yong-Fei Zheng, Ren-Xu Chen] 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 12h 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±11ppm (wt), respectively. The garnet that was preheated at 350°C for 4h also gave constant δD values of −86±6‰ and H2O contents of 281±13ppm (wt). The latter result for the H2O contents agrees with the H2O contents 271±58ppm (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. Springer-Verlag, 2007 Nominally anhydrous mineral nationallicence Hydrous mineral nationallicence Hydrogen isotopes nationallicence Water concentration nationallicence Analytical technique nationallicence Gong Bing CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, 230026, Hefei, China aut Zheng Yong-Fei CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, 230026, Hefei, China aut Chen Ren-Xu CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, 230026, Hefei, China aut Physics and Chemistry of Minerals Springer-Verlag 34/10(2007-12-01), 687-698 0342-1791 34:10<687 2007 34 269 https://doi.org/10.1007/s00269-007-0184-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00269-007-0184-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gong Bing CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, 230026, Hefei, China aut NATIONALLICENCE 700 1- Zheng Yong-Fei CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, 230026, Hefei, China aut NATIONALLICENCE 700 1- Chen Ren-Xu CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, 230026, Hefei, China aut NATIONALLICENCE 773 0- Physics and Chemistry of Minerals Springer-Verlag 34/10(2007-12-01), 687-698 0342-1791 34:10<687 2007 34 269 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer