(Table 2) 87Sr/86Sr ratios of DSDP Site 38-336 samples

• Main Authors: Gieskes, Joris M, Lawrence, James R, Perry, Jr, Edward A, Grady, S J, Elderfield, Henry
• Format: Dataset
• Language: English
• Published: PANGAEA 1987
• Subjects: 38-336; Deep Sea Drilling Project; DEPTH; sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg38; North Atlantic/Norwegian Sea; Sample code/label; Sample type; Strontium-87/Strontium-86 ratio; error; Greenland; Norwegian Sea; Greenland Sea; Iceland; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.705147; https://doi.org/10.1594/PANGAEA.705147

Interstitial waters of several sites drilled during the Deep Sea Drilling Project in the Norwegian-Greenland Sea during Leg 38 have revealed substantial changes in dissolved constituents and in the 18O/16O composition of interstitial waters. Studies of the chemical composition of the bulk sediments and their <1µm fraction indicate the presence of large amounts of volcanic ash, especially in sites close to Iceland. The presence of authigenic clay minerals (illite/smectite) suggests that alteration of this volcanic ash is an important process. A study of Site 348 reveals that dissolved Ca gradients are caused mainly by transport from the underlying basalts, but that decreases in Mg and d18O (H2O) are largely due to reactions involving alteration of volcanic ash in the sediments. Studies of 87Sr/86Sr distributions of dissolved Sr confirm this process in those sites with high contents of volcanic matter. On the other hand, in sites where the chemical composition of dissolved constituents has been little influenced by alteration reactions. 87Sr/86Sr ratios reveal complete diffusive exchange with present-day seawater.