Strontium isotope ratios of pore waters and planktonic foraminifera from DSDP holes

• Main Authors: Hess, Jennifer, Bender, Michael L, Schilling, Jean-Guy
• Format: Dataset
• Language: English
• Published: PANGAEA 1986
• Subjects: 29-277; 32-305; 39-356; 41-366; 68-502; 72-516; 72-516F; 86-577; 90-593; Antarctic Ocean/PLATEAU; Caribbean Sea/RIDGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg29; Leg32; Leg39; Leg41; Leg68; Leg72; Leg86; Leg90; North Atlantic/CONT RISE; North Pacific; North Pacific/CONT RISE; South Atlantic/CONT RISE; South Atlantic/PLATEAU; South Pacific/Tasman Sea/PLATEAU; Antarctic; Antarctic Ocean; Pacific; Antarc*; North Atlantic; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.712599; https://doi.org/10.1594/PANGAEA.712599

A detailed record of the strontium-87 to strontium-86 ratio in seawater during the last 100 million years was determined by measuring this ratio in 137 well-preserved and well-dated fossil foraminifera samples. Sample preservation was evaluated from scanning electron microscopy studies, measured strontium-calcium ratios, and pore water strontium isotope ratios. The evolution of the strontium isotopic ratio in seawater offers a means to evaluate long-term changes in the global strontium isotope mass balance. Results show that the marine strontium isotope composition can be used for correlating and dating well-preserved authigenic marine sediments throughout much of the Cenozoic to a precision of +/- 1 million years. The strontium-87 to strontium-86 ratio in seawater increased sharply across the Cretaceous/Tertiary boundary, but this feature is not readily explained as strontium input from a bolide impact on land.