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

Author(s): Hess, Jennifer; Bender, Michael L.; Schilling, Jean-Guy
Author Affiliation(s): Primary:
Univ. R.I., Geol. Sch. Oceanogr., Narragansett, RI, United States
Volume Title: Science
Source: Science, 231(4771), p.979-984. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075 CODEN: SCIEAS
Note: In English. 48 refs.; illus. incl. 3 tables
Summary: Unaltered fossil foraminifera from biostratigraphically and magnetostratigraphically dated cores from both Atlantic and Pacific Oceans were analysed for strontium isotope ratios. Sea-water 87Sr/86Sr increases between 100 and 70 m.y., peaks at the Cretaceous-Tertiary boundary, decreases to approx 45 m.y., increases again to approx 12 m.y., levels off to about 8 m.y., then rises to its present value. The spike at the K-T boundary is larger than can be accounted for by bolide-impact based on Pt-Ir anomalies. Strontium isotope stratigraphy has a precision of + or - 1 m.y. and may be applied to sediments lacking biostratigraphically significant microfossils.
Year of Publication: 1986
Research Program: DSDP Deep Sea Drilling Project
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Alkaline earth metals; Atlantic Ocean; Biochemistry; Cenozoic; Cores; Cretaceous; Deep Sea Drilling Project; Foraminifera; Geochemistry; Invertebrata; Isotopes; Marine environment; Marine sediments; Mesozoic; Metals; Microfossils; Pacific Ocean; Paleo-oceanography; Paleoecology; Protista; SEM data; Sea water; Sediments; Sr-87/Sr-86; Stable isotopes; Strontium
Record ID: 1986034836
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom

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