Marine Isotope Stratigraphy | SpringerLink
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 …
Isotopes of Strontium: Properties and Applications
The chapter gives an overview of properties and application of stable and radioactive isotopes of strontium. Natural strontium consists of the following four stable isotopes: 84 Sr (0.56%), 86 Sr (9.86%), 87 Sr (7.00%), and 88 Sr (82.58%). Among them, 87 Sr is a radiogenic isotope being the decay product of the long-lived natural beta …
Variations in the strontium isotopic ratio of seawater during …
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 …
Immigration to Tikal, Guatemala: Evidence from stable strontium …
The δ 18 O of rainfall varies systematically around the world, with higher values in equatorial regions and coastal areas, ... Strontium isotope samples were taken from many of the same teeth as the light stable isotope samples, although only one tooth was sampled per burial. Most of the Sr samples are from mandibular canines, but a few …
Barium Isotopes
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.
Strontium isotope dating influenced by Rubidium …
Strontium isotopes (87 Sr/ 86 Sr) are commonly used to assess the age of Cenozoic dolostones found on many isolated oceanic islands.The possible influence of Rubidium (Rb) content on the 87 Sr/ 86 Sr ratios, however, has generally been ignored. This critical issue is assessed by examining the 87 Sr/ 86 Sr ratios and elements (Rb, Sr, Al, Ti and K) of …
Variations in the strontium isotopic ratio of …
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. …
Synchronous changes in seawater strontium …
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 …
Marine Strontium Isotope Evolution at the Triassic‐Jurassic …
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.
Barium Isotopes
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 ...
(PDF) Strontium Isotopes In Seawater Through Time
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 ...
Isotopes of Strontium: Properties and Applications
The chapter gives an overview of properties and application of stable and radioactive isotopes of strontium. Natural strontium consists of the following four stable …
Strontium (87Sr/86Sr) mapping: A critical review of methods …
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 …
Strontium isotopes and rare earth elements as tracers of
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 ...
Strontium
Strontium-90, a radioactive isotope, is a by-product of nuclear reactors and present in nuclear fallout. It has a half-life of 28 years. It is absorbed by bone tissue instead of calcium and can destroy bone marrow and cause cancer. However, it is also useful as it is one of the best high-energy beta-emitters known.
(PDF) High-Resolution Stratigraphy with …
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 ...
(PDF) Strontium isotopes as tracers for quantifying mixing …
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 ...
Strontium isotope evolution of Late Permian and Triassic …
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 …
41. STRONTIUM ISOTOPES IN PORE WATERS OF …
The area of apparent advection includes the eastern part of the equatorial high-productivity zone and part of the Guatemala Basin. We attempted to find links between …
Strontium isotope dating of evaporites and the breakup of …
New and existing strontium isotope data are given for several widespread evapo-rites from western equatorial Pangea. The data indicate evaporite deposition occurred on proximal margins of the Gulf ...
Geochemical behavior of stable strontium isotopes during …
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 ...
Strontium isotopes in tap water from the coterminous USA
There are four natural isotopes of Sr, 3 non-radiogenic (84 Sr, 86 Sr, and 88 Sr) and 1 radiogenic, the product of radioactive decay. The radiogenic isotope, 87 Sr, is formed through the β-decay of 87 Rb, which has a half-life of 48.8 × 10 9 years. By convention, measured Sr isotope ratios are reported as 87 Sr/ 86 Sr and calculated as
Strontium isotope dating of evaporites and the breakup of …
New and existing strontium isotope data are given for several widespread evaporites from western equatorial Pangea. The data indicate evaporite deposition occurred on proximal margins of the Gulf ...
Sr Isotopes in Seawater
Geol. Soc. Am. Today, vol. 2, 93 – 95. Google Scholar. Fantle, M. S., and DePaolo, D. J., 2006, Sr isotopes and pore fluid chemistry in carbonate sediment of the Ontong Java Plateau: Calcite recrystallization rates and evidence for a rapid rise in seawater Mg over the last 10 million years. Geochim. Cosmochim.
Strontium Isotopes in Biological Material: A Key Tool for …
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., …
High-Resolution Stratigraphy with Strontium …
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 …
Strontium isotopes in ocean water and marine sediments
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 ...
Strontium Isotopes
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 ...
Diagenetic effects on strontium isotopes in shallow-water …
Seawater 87 Sr/ 86 Sr ratios have been used as a proxy for continental weathering flux and the partial pressure of atmospheric CO 2 (pCO 2) in Earth's past, but the fidelity of 87 Sr/ 86 Sr records in marine carbonates under diagenesis remains controversial. To investigate this issue, we undertook an integrated chemostratigraphic …
Frontiers | A Systematic Assessment of Stable Sr Isotopic …
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 …