2026-10-15T12:53:34Z https://oai.datacite.org/oai

doi:10.1594/pangaea.712599 2024-08-16T06:39:39Z PANGAEA PANGAEA.REPOSITORY

Strontium isotope ratios of pore waters and planktonic foraminifera from DSDP holes Hess, Jennifer Bender, Michael L Schilling, Jean-Guy PANGAEA 1986 Issued: 1986 doi:10.1126/science.231.4741.979 Drilling/drill rig Leg29 Leg32 Leg39 Leg41 Leg68 Leg72 Leg86 Leg90 Glomar Challenger Deep Sea Drilling Project (DSDP) 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. Supplement to: Hess, Jennifer; Bender, Michael L; Schilling, Jean-Guy (1986): Evolution of the ratio of strontium-87 to strontium-86 in seawater from Cretaceous to present. Science, 231(4741), 979-984 en Collection Supplementary Publication Series of Datasets application/zip Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode