Pore-water chemistry of ODP Leg 114 holes ...

• Main Authors: Froelich, Philip N, Mortlock, Richard A, Mefferd, M, Powers, J
• Format: Dataset
• Language: English
• Published: PANGAEA 1991
• Subjects: Event label; Sample code/label; DEPTH, sediment/rock; pH; Alkalinity, total; Salinity; Magnesium; Calcium; Chloride; Sulfate; Fluoride; Silicon; Strontium; Potassium; Lithium; Barium; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg114; Joides Resolution; Ocean Drilling Program ODP; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.755281; https://doi.pangaea.de/10.1594/PANGAEA.755281

Pore-water samples were recovered at five sites from ODP Leg 114 in the subantarctic South Atlantic Ocean and analyzed for pH, alkalinity, chloride, sulfate, fluoride, silica, magnesium, calcium, strontium, potassium, lithium, and barium. At sites in the East Georgia Basin and on the Islas Orcadas Rise, Ca increases and Mg decreases linearly downhole with a DeltaMg/DeltaCa ratio reflecting conservative diffusive exchange and basalt basement reactions. At sites on the west flank of the Mid-Atlantic Ridge and on the Meteor Rise, Ca gradients are nonlinear, and nonconservative DeltaMg/DeltaCa ratios reflect alteration reactions of abundant silicic volcanic ash in the sediment. K decreases linearly downhole at all sites, reflecting uptake by basement and the absence of significant sediment-hosted reactions. SO4 decreases and alkalinity increases downhole are due to a slight sulfate reduction at all sites except at Site 701. Sr increases downhole at all sites except Site 701, with DeltaSr/DeltaCa ratios ... : Supplement to: Froelich, Philip N; Mortlock, Richard A; Mefferd, M; Powers, J (1991): Interstitial-water chemistry: abyssal South Atlantic and East Georgia basins, Islas Orcadas and Meteor Rises. In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 719-731 ...