Evolution of the ratio of strontium-87 to strontium-86 in seawater from cretaceous to present.
作者： J. HESS , M. L. BENDER , J.-G. SCHILLING
DOI: 10.1126/SCIENCE.231.4741.979
关键词: Foraminifera 、 Authigenic 、 Radiometric dating 、 Isotopes of strontium 、 Seawater 、 Cretaceous 、 Mineralogy 、 Geology 、 Stable isotope ratio 、 Strontium
摘要: A detailed record of the strontium-87 to strontium-86 ratio in seawater during last 100 million years was determined by measuring this 137 well-preserved and well-dated fossil foraminifera samples. Sample preservation evaluated from scanning electron microscopy studies, measured strontium-calcium ratios, pore water strontium isotope ratios. The evolution isotopic offers a means evaluate long-term changes global mass balance. Results show that marine composition can be used for correlating dating authigenic sediments throughout much Cenozoic precision +/-1 years. increased sharply across Cretaceous/Tertiary boundary, but feature is not readily explained as input bolide impact on land.
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