Results 241 to 250 of about 165,943,902 (286)
Some of the next articles are maybe not open access.
The Origin of Strontium and the Strontium Isotope Budget of the River Nile
Isotopes in Environmental and Health Studies, 1997Abstract The river Nile has been used as an example to study the evolution of the Sr content and the Sr isotope ratios in rivers in dependence on rock types of the catchment areas, the mixing of the waters from tributaries, the levelling out in a reservoir and evaporation losses.
H. Gerstenberger +2 more
openaire +1 more source
Strontium Isotopic Composition of Mid-Cretaceous Seawater
Science, 1994The 87 Sr/ 86 Sr ratio in fish teeth separated from mid-Cretaceous marl and black shale from the northeastern Apennines and Venetian Alps (Italy) define three periods of low 87 Sr/ 86 Sr ratio at 121 to 124 million years ago (Ma), 110 to 115 Ma,
INGRAM B. LYNN +3 more
openaire +3 more sources
Permian strontium isotope stratigraphy
Geological Society, London, Special Publications, 2016Abstract The secular evolution of the Permian seawater 87 Sr/ 86 Sr ratios carries information about global tectonic processes, palaeoclimate and palaeoenvironments, such as occurred during the Early Permian deglaciation, the formation of Pangaea and the Permian–Triassic (P–Tr) mass
Korte, C, Ullmann, CV
openaire +2 more sources
Strontium Isotope Fractionation in the Kiglapait Intrusion
Science, 1983The initial ratio of strontium-87 to strontium-86 rises systematically from 0.70395 to 0.70662 over the upper 10 percent of the Kiglapait layered intrusion. This ratio is strongly correlated with potassium and rubidium. Contamination, exchange, and magma mixing fail to account for the increase, which is ascribed to the imperfect retention of radiogenic
openaire +2 more sources
Dating phosphogenesis with strontium isotopes
Geochimica et Cosmochimica Acta, 1990Authigenic and replacement francolites in modern phosphorite have values of {sup 87}Sr/{sup 86}Sr within error of that of modern marine Sr (0.70916 {plus minus} 2). During the phosphatisation of carbonate, Sr is not inherited from the carbonate but is totally exchanged with Sr in ambient water. The {sup 87}Sr/{sup 86}Sr in shallow marine pore waters is
J.M McArthur +4 more
openaire +1 more source
Strontium Isotope Stratigraphy
2010Abstract This article outlines the history, theory, and application of Sr-isotope stratigraphy, and provides an outline of some recent uses of the method that may be of interest to readers. Application of Modern Stratigraphic Techniques: Theory and Case Histories SEPM Special Publication No.
openaire +1 more source
Isotopes of Strontium: Properties and Applications
2019The chapter gives an overview of properties and application of stable and radioactive isotopes of strontium. Natural strontium consists of the following four stable isotopes: 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.00%), and 88Sr (82.58%). Among them, 87Sr is a radiogenic isotope being the decay product of the long-lived natural beta-emitting isotope 87Rb;
Vladimir Sergeevich Semenishchev +1 more
openaire +1 more source