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Evolution of the ratio of strontium-87 to strontium-86 in seawater from cretaceous to present

Journal Article · · Science (Washington, D.C.); (United States)
; ;
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. 49 references, 3 figures, 3 tables.
Research Organization:
Univ. of Rhode Island, Narragansett
OSTI ID:
6105673
Journal Information:
Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 231; ISSN SCIEA
Country of Publication:
United States
Language:
English

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Related Subjects

520301* -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- Water-- (1987)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
ANIMALS
BETA DECAY RADIOISOTOPES
CALCIUM
CENOZOIC ERA
CRETACEOUS PERIOD
ECOLOGICAL CONCENTRATION
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON MICROSCOPY
ELEMENTS
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FORAMINIFERA
FOSSILS
GEOLOGIC AGES
GLOBAL ASPECTS
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INVERTEBRATES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
MASS TRANSFER
MESOZOIC ERA
METALS
MICROORGANISMS
MICROSCOPY
NUCLEI
OXYGEN COMPOUNDS
PROTOZOA
RADIOECOLOGICAL CONCENTRATION
RADIOISOTOPES
RADIONUCLIDE MIGRATION
SARCODINA
SCANNING ELECTRON MICROSCOPY
SEAWATER
SEDIMENTS
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
TERTIARY PERIOD
WATER