| IODP Proceedings Volume contents Search | |||
 | |||
| Expedition reports Research results Supplementary material Drilling maps Expedition bibliography | |||
|
doi:10.2204/iodp.proc.322.212.2016 Data report: δ18O in pore fluids from NanTroSEIZE Expeditions 322 and 3331C. Destrigneville,2 P. Agrinier,3 P. Henry,4 and M.E. Torres5AbstractWe 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. |
||
Figures