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High-precision measurements of δ 17 O and 17 O excess of NBS19 and NBS18

2015; Wiley; Volume: 29; Issue: 23 Linguagem: Inglês

10.1002/rcm.7378

1097-0231

Eugeni Barkan, Israela Musan, Boaz Luz,

Hydrocarbon exploration and reservoir analysis

Rapid Communications in Mass SpectrometryVolume 29, Issue 23 p. 2219-2224 Research Article High-precision measurements of δ17O and 17Oexcess of NBS19 and NBS18 Eugeni Barkan, Corresponding Author Eugeni Barkan Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem, 91904 Israel Correspondence to: E. Barkan, Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem 91904, Israel. E-mail: [email protected]Search for more papers by this authorIsraela Musan, Israela Musan Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem, 91904 IsraelSearch for more papers by this authorBoaz Luz, Boaz Luz Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem, 91904 IsraelSearch for more papers by this author Eugeni Barkan, Corresponding Author Eugeni Barkan Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem, 91904 Israel Correspondence to: E. Barkan, Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem 91904, Israel. E-mail: [email protected]Search for more papers by this authorIsraela Musan, Israela Musan Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem, 91904 IsraelSearch for more papers by this authorBoaz Luz, Boaz Luz Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem, 91904 IsraelSearch for more papers by this author First published: 27 October 2015 https://doi.org/10.1002/rcm.7378Citations: 35Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Rationale Measurements of oxygen-17 excess (17Oexcess) in carbonates have become of great importance. However, to compare results obtained by different laboratories, it is necessary to normalize them to international standards. With this purpose in mind, we measured accurate and high precision δ17O and 17Oexcess values for NBS19 and NBS18, two international standards, for which δ18O values are already widely used as the references for carbonates. Methods The measurements are based on isotopic exchange at steady state between O2 and CO2 over hot platinum sponge at 750°C. Dual-inlet isotope ratio mass spectrometry (IRMS) measurements of the δ17O and δ18O values of this O2 allow δ17O values of CO2 to be obtained with very high precision (0.01 to 0.03 ‰) and, correspondingly, accurate 17Oexcess values with a precision of 5 per meg. Results We measured, for the first time, the δ17O values and 17Oexcess of CO2 liberated from NBS19 at 25°C (39.196 ± 0.026; 20.276 ± 0.015 ‰ and −227 ± 4 per meg, respectively) and NBS18 (17.591 ± 0.041 ‰; 9.253 ± 0.018 ‰ and 3 ± 5 per meg, respectively). The values are given versus VSMOW. Conclusions Accurate values of δ17O and 17Oexcess of the international standards NBS19-CO2 and NBS18-CO2 are now available. The new values should be used for normalization of measured oxygen isotope ratios of carbonates to allow meaningful comparison of results among different laboratories. Copyright © 2015 John Wiley & Sons, Ltd. References 1B. H. Passey, H. Hu, H. Ji, S. Montanari, S. Li, G. A. Henkes, N. E. Levin. Triple oxygen isotopes in biogenic and sedimentary carbonates. Geochim. Cosmochim. Acta 2014, 141, 1. 2T. B. Coplen, J. A. Hopple, J. K. Bohlke, H. S. Peiser, S. E. Rieder, H. R. Krouse, K. J. R. Rosman, T. Ding, R. D. Vocke, K. Revesz, A. Lamberty, P. D. P. Taylor, P. De Bièvre. Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents. U.S. Geological Survey Water-Resources Investigations Report 01-4222, 2002. 3R. M. Verkouteren, D. B. Klinedinst. 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