Results 231 to 240 of about 29,328 (286)

Wildlife trade investigations benefit from multivariate stable isotope analyses. [PDF]

open access: yesBiol Rev Camb Philos Soc
Prigge TL   +6 more
europepmc   +1 more source

Permian strontium isotope stratigraphy

Geological Society, London, Special Publications, 2016
Abstract 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

High-Resolution Stratigraphy with Strontium Isotopes

Science, 1985
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 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
D J, Depaolo, B L, Ingram
openaire   +2 more sources

Strontium Isotopes in Deep-Sea Sediments

Science, 1966
Recent deep-sea sediments, leached of carbonate, have Sr 87 : Sr 86 ratios ranging from 0.7044 to 0.7394. Strontium in the detrital sediment has not equilibrated isotopically with seawater strontium. Amounts of strontium-bearing authigenic material in the clay-mineral assemblage are not great
E J, Dasch, F A, Hills, K K, Turekian
openaire   +2 more sources

Ground-state properties of strontium isotopes

Physical Review C, 1995
We present systematic constrained Hartree-Fock calculations of ground-state properties of even strontium isotopes ({ital A}=76--100) with the Skyrme interaction. Approximate projection of angular momentum is done after variation by explicit inclusion of the rotational energy {minus}{l_angle}{ital {cflx j}}{sup 2}{sub {ital x}}{r_angle}/J.
, Baran, , Höhenberger
openaire   +2 more sources

Strontium isotope stratigraphy

Palaeogeography, Palaeoclimatology, Palaeoecology, 1986
The 87Sr/86Sr ratio of sea water has changed significantly with time in response to the input of varying proportions of Sr derived from continental crust and upper mantle sources, as moderated and buffered by carbonate recycling. Because of these fluctuations, the marine Sr isotope record can be used for stratigraphic correlation and absolute dating ...
openaire   +1 more source

Strontium Isotopic Composition of Mid-Cretaceous Seawater

Science, 1994
The 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

Strontium and Neodymium Isotopes

2019
The chapter presents data on Rb–Sr and Sm–Nd TIMS analysis of pyroxenes, plagioclases, gross samples of igneous rocks and sulphide ores. In most Sm–Nd analyses of minerals, the isotope system (pyroxene–plagioclase) does not reflect the age of intrusions and shows a rejuvenated or aged isochronous age.
Yevgeny Bogomolov   +3 more
openaire   +1 more source

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