Chemistry of interstitial-water samples from ODP Leg 105 sites (Table 1) ...

• Main Authors: Zachos, James C, Cederberg, T
• Format: Dataset
• Language: English
• Published: PANGAEA 1989
• Subjects: Event label; Sample code/label; DEPTH, sediment/rock; pH; Alkalinity, total; Salinity; Chlorinity; Calcium; Magnesium; Sulfate; δ Deuterium; δ18O, water; Silicon dioxide; Phosphate; Strontium; Lithium; Potassium; Manganese; Drilling/drill rig; Composite Core; DSDP/ODP/IODP sample designation; Leg105; Joides Resolution; Ocean Drilling Program ODP; Baffin Bay; Baffin; Labrador Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.744884; https://doi.pangaea.de/10.1594/PANGAEA.744884

More than 100 interstitial-water samples from Sites 645, 646, and 647 were analyzed for major and minor ion chemistry. All sites display increases in calcium and decreases in magnesium with depth. The rate of change for these ions varies from site to site as a result of differences in rates of diffusion and sediment/water chemical reactions related to sediment lithology, physical properties, and redox conditions. The latter condition is reflected by the rate of sulfate reduction at each site. The lowest sulfate concentrations were observed at Site 645, where anomalously large depletions of calcium and magnesium are also recorded just below the sediment/water interface. Other dissolved ions, such as potassium, lithium, and strontium, also display overall anomalous depletions at Site 645. In contrast, concentration gradients of most cations at Sites 646 and 647, where dissolved sulfate is present, are more linear and may be primarily supported by diffusion between layer II basalts below and seawater ... : Supplement to: Zachos, James C; Cederberg, T (1989): Interstitial-water chemistry of Leg 105 Sites 645, 646, and 647, Baffin Bay and Labrador Sea. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 171-183 ...