strontium isotope upper

Strontium isotope dating of bivalve faunas from the Upper ...

Studencka B. & Zieliński G., 2013. Strontium isotope dating of bivalve faunas from the Upper Miocene Cacela Formation, eastern Algarve, Portugal: evidence from Messinian bivalve fauna. Geological Quarterly, 57 (4): 665–686. Abstract: The study is focused on the determination of the geological age of bivalve fauna recovered from four fossiliferous sequences in the Cacela Formation…

Strontium - Wikipedia

Isotopes. Natural strontium is a mixture of four stable isotopes: 84 Sr, 86 Sr, 87 Sr, and 88 Sr. Their abundance increases with increasing mass number and the heaviest, 88 Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic 87 Sr as the daughter of long-lived beta-decaying 87 Rb.

Revised Middle–Upper Jurassic strontium isotope …

The Middle–Upper Jurassic strontium isotope stratigraphy has a great potential because of significant variations in the seawater 87Sr/86Sr ratios, common occurrences of well-preserved belemnite rostra and oyster shells, and its potential applicability to dating of hy-

Strontium isotope stratigraphy in the upper Cenomanian ...

Apr 24, 2008· Read "Strontium isotope stratigraphy in the upper Cenomanian shallow-water carbonates of the southern Apennines: Short-term perturbations of marine 87 Sr/ 86 Sr during the oceanic anoxic event 2, "Palaeogeography, Palaeoclimatology, Palaeoecology"" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available …

Relationship of strontium isotope ratio and chemical ...

/ Relationship of strontium isotope ratio and chemical composition of micro inclusions in fibrous diamonds : Implication for isotopically different components of the upper mantle. In: GEOCHEMICAL JOURNAL. 1999 ; Vol. 33, No. 2. pp. 101-107.

Strontium isotope disequilibrium of plagioclase in the ...

and between different plagioclase populations were repor- ted in the Upper Critical Zone, and it was suggested that Keywords Bushveld Complex Upper Critical Zone the different Pb isotope compositions of plagioclase grains Plagioclase In situ strontium isotopes may reflect crystallization from different parental magmas LA-MC-ICP-MS (Mathez and ...

SEAWATER STRONTIUM ISOTOPES, OCEANIC ANOXIC …

the end of the strontium-isotope excursion, whereas the two Cretaceous OAEs oc-curred at the onset of the accompanying strontium-isotope excursions. The possible causes of these excursions were evaluated by successively examining the changes in the riverine strontium fluxes, riverine 87Sr/86Sr ratios, or hydrothermal

Environmental isotopes - Wikipedia

Strontium-86 and strontium-87 are both stable isotopes of strontium, but strontium-87 is radiogenic, coming from the decay of rubidium-87. The ratio of these two isotopes depends on the concentration of rubidium-87 initially and the age of the sample, assuming that the background concentration of strontium-87 is known.

21. STRONTIUM ISOTOPE VARIATIONS AND SEDIMENT …

21. STRONTIUM ISOTOPE VARIATIONS AND SEDIMENT REWORKING OF THE UPPER OLIGOCENE-NEOGENE INTERVAL FROM SITES 871 AND 8721 Carsten Israelson,2 Paul N. Pearson,3 and Bjorn Buchardt2 ABSTRACT Strontium isotopes were used to evaluate the subsidence and sedimentation history of Limalok and Lo-En guyots in the western Pacific Ocean.

Strontium isotope evidence for late Pleistocene ...

Here we resolve the timing of Lake Victoria's overflow by using strontium isotopes as a tracer for water from the principal lakes and rivers of the Upper Nile. Our data demonstrate that overflow of Lakes Victoria and Albert into the Nile drainage network occurred no later than 11.5 14 C ka.

Strontium isotopic compositions of Cambrian (Upper ...

The strontium isotope characteristics of different types of Cambrian dolomites are identified. • The properties and sources of dolomitizing fluid are confirmed. • The timing and mechanisms of dolomitization are confirmed. • Using the Δ 87 Sr/ 86 Sr to assess the variations of strontium isotope.

Dolomitization by hypersaline reflux into dense ...

Strontium isotopes. Strontium isotope (87 Sr/ 86 Sr) analyses of TMD (Table 2) in the current study show a wide range of values (0·7080 to 0·7117), far higher than the marine 87 Sr/ 86 Sr ratio of 0·70775 measured by Korte et al. on brachiopods of the Muschelkalk Sea. Hauptmuschelkalk dolomites show values around 0·710, except for one ...

Sr-isotope stratigraphy of the Upper Jurassic of central ...

Sep 13, 2008· Oysters are shown once more to be suitable for strontium isotope studies. Their calcitic shells are often unaffected by diagenesis. In particular for marginal marine Jurassic and Cretaceous strata, where belemnites are usually absent, oysters may serve as a valuable tool for isotope …

Use of strontium isotopes to constrain the timing and mode ...

Swart, P. K., Ruiz, J., & Holmes, C. W. (1987). Use of strontium isotopes to constrain the timing and mode of dolomitization of Upper Cenozoic sediments in a core from San Salvador, Bahamas.

Strontium Isotope study of the Peconic River Watershed ...

Strontium Isotope study of the Peconic River Watershed Long Island, New York Geng Xin and Gilbert N.Hanson Department of Earth and Space Sciences State University of New York at Stony Brook Stony Brook, NY 11794-2100 Written in 1994 Based on the MS Thesis by Geng Xin "Strontium Isotope Study of the Peconic River Watershed, Long Island,

(PDF) Carbon, oxygen, and strontium isotope geochemistry ...

The carbon, oxygen, and strontium isotope compositions of carbonate rocks from the upper Miocene Kudankulam Formation, southern India, were measured to understand palaeoenvironment and carbonate ...

Strontium isotope age-dating of fossil shark tooth ...

Strontium isotope age-dating of fossil shark tooth enameloid from the Upper Cretaceous Strata of Alabama and Mississippi, USA T. Lynn Harrell Jr a, *, Alberto Perez-Huerta a, b, George Phillips c a Department of Geological Sciences, University of Alabama, Box 870338, Tuscaloosa, AL 35487, USA b Alabama Museum of Natural History, Tuscaloosa, AL 35487, USA c Mississippi Museum of Natural …

RI0195D. Deposition and Diagenesis in ...Permian Upper ...

Fisher, R. S., and Posey, H. H., 1990, Deposition and Diagenesis in a Marine-to-Evaporite Sequence: Permian Upper Wolfcamp Formation and Lower Wichita Group, Palo Duro Basin, Texas Panhandle: The University of Texas at Austin, Bureau of Economic Geology, Report of Investigations No. 195, 34 p

Evolution of the upper mantle of the Earth's Moon ...

Evolution of the upper mantle of the Earth's Moon: Neodymium and strontium isotopic constraints from high-Ti mare basalts GREGORY A. SNYDER,' DER-CHUEN LEE,~ LAWRENCE A. TAYLOR,' ALEX N. HALLIDAY,' and ERIC A. JERDE'

Application of the trace element and isotope geochemistry ...

Gianluca Frijia, Mariano Parente, Matteo Di Lucia and Maria Mutti, Carbon and strontium isotope stratigraphy of the Upper Cretaceous (Cenomanian-Campanian) shallow-water carbonates of southern Italy: Chronostratigraphic calibration of larger foraminifera biostratigraphy, Cretaceous Research, 10.1016/j.cretres.2014.11.002, 53, (110-139), (2015).

Strontium-isotope stratigraphy of Upper ... - DeepDyve

Aug 01, 2012· Read "Strontium-isotope stratigraphy of Upper Cretaceous rudist bivalves: Biozones, evolutionary patterns and sea-level change calibrated to numerical ages, Earth-Science Reviews" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

USING STRONTIUM ISOTOPES IN CONJUNCTION WITH …

USING STRONTIUM ISOTOPES IN CONJUNCTION WITH MAJOR, AND TRACE ELEMENTS TO IDENTIFY WATER/ROCK INTERACTION IN THE UPPER KITTITAS COUNTY, WASHINGTON by James D. Patterson August 2017 The complex bedrock lithologies in the Upper Kittitas County provide an ideal setting for developing isotopic methodology to identify groundwater sources and track

New tool to save salmon: isotope tracking - College of ...

New tool to save salmon: isotope tracking ... mainly the upper regions of the Nushagak watershed. Tracking the fish by their strontium isotope ratios revealed the chinook salmon had four distinct life histories: 72 percent of the fish stayed where they hatched until they swam downstream to Bristol Bay and the Pacific; 17 percent stayed mostly ...

Strontium isotope disequilibrium of ... - SpringerLink

Jun 21, 2013· Abstract. We report in situ Sr isotope data for plagioclase of the Bushveld Complex. We found disequilibrium Sr isotopic compositions on several scales, (1) between cores and rims of plagioclase grains in the Merensky pyroxenite, the Bastard anorthosite, and the UG1 unit and its noritic footwall, (2) between cores of different plagioclase grains within thin sections of anorthosite and ...

Isotopes of strontium - Wikipedia

Because strontium has an electron configuration similar to that of calcium, it readily substitutes for Ca in minerals. In addition to the four stable isotopes, thirty-one unstable isotopes of strontium are known to exist (see Table, below): the longest-lived of these are 90 Sr with a half-life of 28.9 years and 85 Sr

The evolution of strontium isotopes in the upper ...

Apr 26, 1990· We argue here that the strontium isotope paradox instead largely reflects the gradual increase in Rb/Sr with time in the upper continental crust. ... The evolution of strontium isotopes …

Carbon and strontium isotope stratigraphy of the Upper ...

Carbon and strontium isotope stratigraphy of the Upper Cretaceous (Cenomanian-Campanian) shallow-water carbonates of southern Italy: Chronostratigraphic calibration of larger foraminifera biostratigraphy. Download.

Strontium-90 - Wikipedia

Strontium-90 (90 Sr) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.8 years. It undergoes β − decay into yttrium-90, with a decay energy of 0.546 MeV. Strontium-90 has applications in medicine and industry and is an isotope of concern in fallout from nuclear weapons and nuclear accidents.