Interstitial-water chemistry of ODP Leg 119 sites

• Main Author: Cranston, Ray E
• Format: Dataset
• Language: English
• Published: PANGAEA 1991
• Subjects: 119-736; 119-737; 119-738; 119-739; 119-744; 119-745; 119-746; 119-746A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg119; Ocean Drilling Program; ODP; Prydz Bay; Indian
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.758179; https://doi.org/10.1594/PANGAEA.758179

Ocean Drilling Program inorganic geochemistry procedures routinely overlook more than 99% of the sediment column. Present and past biogeochemical reactions alter the sediment record; however, most of these reaction zones are bypassed by the normal methods where samples are collected every 30 m. A new approach to increase resolution was introduced during Leg 119. Ten milliliters of sediment provided interstitial-water samples for ammonia, silica, sulfate, magnesium, and calcium analyses. The new method introduced some systematic differences in concentrations, as well as some decrease in precision. A number of advantages, however, may warrant using the method in some instances. In cases where routine interstitial-water data showed anomalous results, core sections were retrieved from the storage facility and resampled. The new high-resolution procedure was used to provide water samples in cases were water contents were low and routine squeezing could not recover pore water.