Results 301 to 310 of about 40,961 (371)

Distribution of strontium isotopes in river waters across the Tarim Basin: a map for migration studies

Journal of the Geological Society, 2018
As the junction of the Silk Roads, the Tarim Basin played a critical role in human migration and cultural interaction between the East and the West.
Xueye Wang, Zihua Tang, Xinxin Dong
semanticscholar   +1 more source

Strontium isotope analysis of apatite via SIMS

Chemical Geology, 2021
Abstract We report the development of a SIMS analytical method for in situ Sr isotope analysis of the mineral apatite at an analytical scale of 15 μm or less. Experiments were conducted on a series of reference apatites of widely differing Sr contents at three different mass resolution settings: low (3000), moderate (4200) and very high (16000 ...
Jack Gillespie, Alexander A. Nemchin, Peter D. Kinny, Laure Martin, Matvei Aleshin, Malcolm P. Roberts, Trevor R. Ireland, Martin J. Whitehouse, Heejin Jeon, Aaron J. Cavosie, Christopher L. Kirkland   +10 more
openaire   +1 more source

Strontium-isotope stratigraphy of Enewetak Atoll

Geology, 1988
/sup 87/Sr//sup 86/Sr ratios determined for samples from a 350 m core of Neogene lagoonal, shallow-water limestones from Enewetak Atoll display a remarkably informative trend. Like the recently published data for Deep Sea Drilling Project (DSDP) carbonates, /sup 87/Sr//sup 86/Sr at Enewetak increases monotonically but not smoothly from the early ...
K. R. Ludwig, R. B. Halley, K. R. Simmons, Z. E. Peterman   +3 more
openaire   +1 more source

Isotopic Composition of Strontium in Carbonatites

Nature, 1962
THE origin of carbonatites has attracted increasing interest in recent years. The problem can be said to hinge on whether or not sedimentary carbonate rocks are involved in the formation of carbonatite. Since in general the strontium-87/strontium-86 ratios of sedimentary carbonate rocks1 differ from those of mafic igneous rocks2 we felt that a study of
J. L. POWELL, P. M. HURLEY, H. W. FAIRBAIRN   +2 more
openaire   +1 more source

Nuclear charge radii of proton-rich strontium isotopes

Physical Review C, 1987
A new technique of atom-photon coincidence laser spectroscopy has been developed and used to study the isotope shifts of $^{78\mathrm{\ensuremath{-}}84}\mathrm{Sr}$. The results show that neither the droplet model nor existing interacting boson model calculations can adequately describe the rapid onset of nuclear deformation below N=50.
, Eastham, , Walker, , Smith, , Warner, , Griffith, , Evans, , Wells, , Fawcett, , Grant   +8 more
openaire   +2 more sources

Strontium isotope characterization of wines from Quebec, Canada

Food Chemistry, 2016
The (87)Sr/(86)Sr isotope ratios were measured on grape, wine and soil samples collected in 13 commercial vineyards located in three major wine producing areas of Quebec (Canada). The soils yield Sr isotope ratios that are intimately related to the local geology and unambiguously discriminate the different producing areas.
Victor Vinciguerra, Ross Stevenson, Karine Pedneault, André Poirier, Jean-François Hélie, David Widory   +5 more
openaire   +2 more sources

Specific activity and isotope abundances of strontium in purified strontium-82

Journal of Analytical Atomic Spectrometry, 2016
A linear accelerator was used to irradiate a rubidium chloride target with protons to produce strontium-82 (Sr-82), and the Sr-82 was purified by ion exchange chromatography.
J. M. Fitzsimmons, D. G. Medvedev, L. F. Mausner   +2 more
openaire   +1 more source

Kinetics of isotopic exchange between strontium polymolybdate and strontium ions in aqueous solution

Applied Radiation and Isotopes, 2002
A heterogeneous isotopic exchange reaction of strontium polymolybdate in strontium chloride solution was studied using 90Sr as a tracer. The effects of low and high strontium chloride concentration on the rate and mechanism of the isotopic exchange reaction were investigated.
Gulten, Atun, Binay, Bilgin, Ayben, Kilislioglu   +2 more
openaire   +2 more sources

Uses of Strontium Isotopes in Petrogenesis

1972
The isotopic composition of strontium is not only a useful indicator of the ages of rocks and minerals, but it also contains information about the origin of igneous rocks and about the geologic processes that have affected their chemical compositions.
Gunter Faure, James L. Powell
openaire   +1 more source

A strontium isotope study of metamorphosed limestones

Lithos, 1970
Abstract Sr 87 /Sr 86 ratios are presented for calcites extracted from metamorphosed Grenville marbles. These range from 0.7021 to 0.7090, and thus cover a spread of values representative of both sedimentary limestones and carbonatites. It appears that sedimentary limestones have a much wider spread of Sr 87 /Sr 86 values than is generally assumed ...
J Gittins, A Hayatsu, D York
openaire   +1 more source