Proc. IODP, 322, Data report: δ18O in pore fluids from NanTroSEIZE Expeditions 322 and 333

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Chapter contents Abstract Introduction Analytical methods Results Acknowledgments References Figures F1. Bathymetric map. F2. Downhole profiles of δ¹⁸O. Table T1. δ¹⁸O of pore fluids. PDF file			Previous \| Next doi:10.2204/iodp.proc.322.212.2016 Analytical methods The isotopic composition of oxygen was measured in pore fluid samples recovered from Sites C0011 and C0012 at the Institut de Physique du Globe de Paris (IPGP). A pore water aliquot (0.8 mL) sample was equilibrated with a He + CO₂ gas mixture at 25°C for 8 h, and the ¹⁸O/¹⁶O ratio on the CO₂ gas phase was measured with an isotope ratio mass spectrometer interfaced with gas chromatography (GC-IRMS; Analytical Precision 2003). The measurements were calibrated using a set of three house water standards calibrated versus standard mean ocean water (SMOW). δ¹⁸O are reported against the SMOW standard scale. Measurements of δ¹⁸O were determined with an analytical accuracy better than ±0.1‰. Top of page \| Previous \| Next

Analytical methods