IODP Proc, 311, Data report: stable isotope composition of authigenic carbonates from the northern Cascadia margin, IODP Expedition 311, Sites U1325-U1329

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Chapter contents Abstract Introduction Sampling and analytical methods Results Oxygen and carbon isotopic compositions of carbonates from all sites Oxygen and carbon isotopic distributions with depth Summary Acknowledgments References Figures F1. Location maps. F2. Oxygen and carbon isotopic compositions. F3. δ¹⁸O and δ¹³C values, Site U1326. F4. δ¹⁸O and δ¹³C values, Site U1327. F5. δ¹⁸O and δ¹³C values, Site U1328. F6. δ¹⁸O and δ¹³C values, Site U1329. Table T1. Total carbonate content, mineralogy, and oxygen and carbon isotopic compositions. PDF file		Previous \| Next doi:10.2204/iodp.proc.311.210.2009 Introduction During Integrated Ocean Drilling Program (IODP) Expedition 311, drilling of four sites (U1325, U1326, U1327, and U1329) along a southwest–northeast transect and of the nearby active vent Site U1328, from 2195 to 946 meters water depth, was realized across the accretionary prism offshore Vancouver Island to study the occurrence of gas hydrate (Fig. F1). Site U1328 corresponds to a cold vent with active fluid and gas flow. At these sites, the bottom seawater temperature varies between 1.8°C at the deepest Site U1325 and 3.3°C at the shallowest Site U1329 (data obtained from www.ewoce.org); the δ¹⁸O value of bottom water is probably not far from –0.17‰ standard mean ocean water (SMOW), which is the value of North Pacific Deep Water (Craig and Gordon, 1965). Stable isotope compositions of a selection of 80 samples of authigenic carbonates were measured to characterize the nature of the diagenetic fluids (i.e., water and carbon sources) from which the carbonates were precipitated. Top of page \| Previous \| Next

Introduction