The element strontium has four naturally occurring isotopes: 84 Sr, 86 Sr, 87 Sr, and 88 Sr. Only 87 Sr is radiogenic – produced by the β-decay of 87 Rb with a half-life of 48.8 billion years. The most abundant strontium isotope is 88 Sr, making up approximately 83% of naturally occurring strontium; followed by 10% 86 Sr, 7% 87 Sr and 1% 84 Sr. In …

The delayed resurgence of equatorial forests after the Permian-Triassic ecologic crisis. PNAS, 96 (1999), pp. 13857-13862. View in Scopus ... Howarth R. J., and Bailey T. R. (2001) Strontium isotope stratigraphy: LOWESS version 3: Best fit to the marine Sr-isotope curve for 0–509 Ma and accompanying look-up table for deriving …

Strontium atoms are those having 38 protons in the nucleus. They may also have from 46–50 neutrons, and thus strontium atoms can possess a range of atomic weights – 84, 86, 87, and 88 – depending upon the number of neutrons. The natural abundances of these isotopes are 0.56%, 9.86%, 7.0%, and 82.58%, respectively.

If the 100-kyr periodicity in 87Sr/86Sr is modelled as a simple (single exponential) linear system22, maxima in any potential forcing mechanism must occur no more than 25 kyr …

Strontium isotopes have also been used as a tracer in groundwater (Ojiambo et al., 2003; Philipe et al., 2004) studies. Strontium-rich water is regarded as strontium mineral water (Duo t al., 2021 ...

A composite strontium isotopic seawater curve was constructed for the Miocene between 24 and 6 Ma by combining 87 Sr/ 86 Sr measurements of planktonic foraminifera from Deep Sea Drilling Project sites 289 and 588. Site 289, with its virtually continuous sedimentary record and high sedimentation rates (26 m/m.y.), was used for constructing the …

Marine Strontium Isotope Evolution at the Triassic‐Jurassic Transition Links Transient Changes in Continental Weathering to Volcanism of the Central Atlantic Magmatic Province - Heszler - 2024 - Geochemistry, Geophysics, Geosystems - Wiley Online Library.

Difference in the strontium isotope ratio between bone and enamel in the same individual indicates change in residence. Results from the analysis of 81 Bell Beaker individuals indicated that 51 had moved during their lifetime. Information on the geology of south-central Europe, the application of strontium isotope analysis, and the relevant ...

Strontium inputs from hydrothermal systems play a major role in the 87 Sr/ 86 Sr flux to the ocean (Elderfield and Schultz, 1996), but the magnitude of Sr isotope fractionation and the compositional variation of the end-member solutions in hydrothermal water-rock reactions must be known for accurate estimation of the global marine Sr input …

The strontium-isotope data of the deep sea sediments are plotted against the Rb/Sr ratio in Fig. 1; for reference in this figure is a 500 m.y. isochron with an arbitrary initial Sr^/Sr86 ratio of 0-704. ... In the Equatorial Atlantic strikingly high concentration ofkaolinite, attributed to latite weathering products transported by the Amazon ...

In most studies, the marine strontium isotope ratio is related to the riverine strontium flux (e.g. Raymo, 1991, François et al., ... For example, miospores typical for middle and higher latitudes disappeared at the end of the Givetian and equatorial and (sub)tropical forms spread in subpolar areas during the Frasnian ...

Donald J Depaolo. B. L. Ingram. The isotopic ratio of strontium-87 to strontium-86 shows no detectable variation in present-day ocean water but changes slowly over millions of years. The strontium ...

Dissolution of barite for the analysis of strontium isotopes and other chemical and isotopic variations using aqueous sodium carbonate. Chemical Geology: Isotope Geoscience Section, 52 (3–4 ...

The strontium isotope system includes radiogenic (87 Sr/ 86 Sr) and stable (88 Sr/ 86 Sr) isotopes. The radiogenic Sr isotope ratio ( 87 Sr/ 86 Sr) is a tracer for oceanic Sr input fluxes from weathering and hydrothermal processes (Blum & Erel, 1995 ; Capo & Depaolo, 1990 ).

Strontium (Sr) belongs to the II group of chemical elements of the Periodic Table (alkaline earth metals) along with Beryllium, Magnesium, Calcium, Barium, and Radium, and has an atomic number Z = 38.Sr has four naturally occurring isotopes (i.e., 84 Sr, 86 Sr, 87 Sr, and 88 Sr) one of which produced by radioactive decay of 87 Rb (i.e., …

Dissolution of barite for the analysis of strontium isotopes and other chemical and isotopic variations using aqueous sodium carbonate. Chemical Geology: Isotope Geoscience Section, 52 (3–4), ... Benthic Ba fluxes in the central Equatorial Pacific, implications for the oceanic Ba cycle. Earth and Planetary Science Letters, 142 (3–4), 439–50.

Much attention has been paid to Sr isotopes. Strontium (Sr), the most abundant trace element in rocks, soil, water, and organisms, is an alkaline earth metal with an atomic number of 38. Its geochemical properties are similar to those of Calcium (Ca) which is often replaced in the form of isomorphism (Pathak and Gupta, 2019). Thus, Sr is ...

The region has a marine equatorial climate with high humidity and high temperatures throughout the year. The annual temperatures range from 18 to 33 °C, with a mean of 26 °C. ... Strontium isotope data coupled with Na/Cl and Cl/Sr ratios enable the identification of saline contributions, which significantly modify the natural Sr isotopic ...

The strontium contained in carbonate shells of marine organisms records the ratio of strontium-87 to strontium-86 of the oceans at the time that the shells form. Sedimentary rocks composed of accumulated fossil carbonate shells can be dated and correlated with the use of high precision measurements of the ratio of strontium-87 to strontium-86 ...

Strontium isotope stratigraphy is one of the most powerful and widely applied chemostratigraphic tools to determine ages in otherwise ... N. D., 1973. Oxygen isotope and palaeomagnetic stratigraphy of equatorial Pacific core V28-238: oxygen isotope temperatures and ice volumes on a 10 5 Year and 10 6 year scale. Quaternary …

Strontium isotope stratigraphy: LOWESS version 3: best fit to the marine Sr-isotope curve for 0-509 Ma and accompanying look-up table for deriving numerical age. ... Pac. Equatorial Transect IODP Prel Rept., 320 (2009), 10.2204/iodp.pr.320.2009. Google Scholar. Pälike et al., 2012.

The chapter gives an overview of properties and application of stable and radioactive isotopes of strontium. Natural strontium consists of the following four stable …

1. Introduction. The use of bioavailable strontium in different environments to provenance biological materials has become increasingly common since its first applications in ecology and archaeology almost four decades ago (Ericson, 1985; Graustein and Armstrong, 1983).Provenancing biological materials using strontium isotope ratios has …

PDF | Strontium isotope systematics are introduced and the various components contributing to strontium in seawater are outlined. Residence time of Sr... | Find, read and cite all the research you ...

STRONTIUM ISOTOPES IN PORE WATERS OF EAST EQUATORIAL PACIFIC SEDIMENTS: INDICATORS OF SEAWATER ADVECTION THROUGH OCEANIC CRUST AND SEDIMENTS1 S. Oyun,2 H. Elderfield,2 and G.P. Klinkhammer3 ABSTRACT Pore-water samples from the equatorial sedimentary bulge area show reversals in depth …

pp. 938 - 941. DOI: 10.1126/science.227.4689.938. Abstract. The isotopic ratio of strontium-87 to strontium-86 shows no detectable variation in present-day ocean water …

A strontium isotope baseline of Cyprus. Assessing the use of soil leachates, plants, groundwater and surface water as proxies for the local range of bioavailable strontium isotope composition. Science of The Total Environment, Vol. 708, Issue., p. 134714.

THE strontium isotope ratio in sea water is influenced by climate, tectonics, weathering and hydrothermal activity at ocean ridges l -4 • Its evolution through time, determined …

The sulfur isotope ratio (δ34S) recorded in marine barite is commonly used to estimate secular changes in the sulfur isotopic composition of seawater sulfate (δ34 S SO4) throughout Earth's history. The Cenozoic record demonstrates a drastic 5‰ increase in seawater δ 34 S SO4 during the Early Eocene. However, the gradient of this excursion ...

Strontium-isotope and trace-metal ratios of 180 soil-water and 18 surface-water sites in the Southern Colorado Plateau have revealed possible source areas for some of 37 archaeological corn cobs ...