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Data report: δ18O in pore fluids from NanTroSEIZE Expeditions 322 and 3331

C. Destrigneville,2 P. Agrinier,3 P. Henry,4 and M.E. Torres5


We report on analyses of the oxygen isotopic composition of pore fluids in sediments from two sites drilled in the Shikoku Basin as part of the Nankai Trough Seismogenic Zone Experiment. Both Sites C0011 and C0012 were cored to sample the input section to the subduction zone offshore southern Japan during Integrated Ocean Drilling Program Expeditions 322 and 333. Pore fluid δ18O analysis was performed using gas chromatography interfaced with isotope ratio mass spectrometry at the Institut de Physique du Globe de Paris. At both sites, pore fluids are depleted in 18O relative to modern seawater: δ18O decreases with depth to values of –4.66‰ (Site C0011) and –3.97‰ (Site C0012) at the bottom of lithologic Unit II and remains relatively constant at –4.5‰ in lithologic Units III and IV. In lithologic Unit V at Site C0011, δ18O slightly decreases to a value of –5.30‰ at 858 meters below seafloor (mbsf), whereas at Site C0012, the δ18O depth profile shows a reverse trend with δ18O values increasing with depth from –4.5‰ to –3.15‰ at 529.2 mbsf.

1 Destrigneville, C., Agrinier, P., Henry, P., and Torres, M.E., 2016. Data report: δ18O in pore fluids from NanTroSEIZE Expeditions 322 and 333. In Saito, S., Underwood, M.B., Kubo, Y., and the Expedition 322 Scientists, Proceedings of the Integrated Ocean Drilling Program, 322: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.322.212.2016

2 Université de Toulouse, UPS-OMP-GET, 14 Avenue Edouard Belin, 31400 Toulouse, France.

3 IPGP, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 1 Rue Jussieu, 75238 Paris Cedex 05, France.

4 CEREGE, CNRS, Avenue Louis Philibert, BP80, 13545 Aix-en-Provence, France.

5 College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis OR 97331, USA.

Initial receipt: 11 May 2016
Acceptance: 15 August 2016
Publication: 7 October 2016
MS 322-212