Results 231 to 240 of about 540,378 (271)

Prediction of radiogenic Sr and Pb isotope signatures in plants using diffusive gradients in thin films. [PDF]

Anal Bioanal Chem
Wagner S, Santner J, Puschenreiter M, Irrgeher J, Prohaska T.   +4 more
europepmc   +1 more source

Ionome Dynamics in Grapevine Leaves. [PDF]

Plants (Basel)
Kováčik J, Vydra M, Husáková L, Piroutková M, Dresler S, Dekan M, Duchoň F.   +6 more
europepmc   +1 more source

Rb–Sr Geochronology (Igneous Rocks)

, 2013
The preferential incorporation of Rb (following K) or Sr (following Ca) into different mineral structures, as well as their differing behaviors during closed system evolution of magmas by fractional crystallization, results in a wide range in Rb/Sr in mineral and whole rock compositions.
Tod Waight, Waight, Tod Earle, Waight, Tod   +2 more
openaire   +3 more sources

Rb, Sr, Nd and Sm concentrations in quartz

Geochimica et Cosmochimica Acta, 1987
The concentrations of Rb, Sr, Nd and Sm in quartz crystals from Crystal Peak, Colorado; Stewart Mine, California; Tomas Gonzaga, Minas Gerais, Brazil; and Coleman Mines, Arkansas, were determined by isotope dilution mass spectrometry. Concentrations ranged from: 1.17 to 177 ppb Rb; 3.26 to 1027 ppb Sr; 0.0159 to 0.48 ppb Sm; 0.127 to 2.81 ppb Nd.
Rossman, George R., Weiss, D., Wasserburg, G. J.   +2 more
openaire   +3 more sources

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In-situ Rb-Sr geochronology

2013 IEEE Aerospace Conference, 2013
This paper reports on the first rubidium-strontium (Rb-Sr) radiometric dates using a Laser Desorption Resonance Ionization Mass Spectrometry (LDRIMS) instrument capable of being miniaturized for flight to another planet. The LDRIMS instrument produces dates in under 24 hours, requires minimal sample preparation, and avoids the interference and mass ...
F. S. Anderson, K. Nowicki, T. Whitaker
openaire   +1 more source

Rb-Sr ages and elemental abundances of K, Rb, Sr, and Ba in samples from the Ocean of Storms

Geochimica et Cosmochimica Acta, 1971
Abstract Rb-Sr internal isochron ages for three basaltic crystalline rocks from the Ocean of Storms are 300–600 m.y. younger than the ages of basaltic rocks from the Sea of Tranquillity. Rock 12063 has an age of 3.34 ± 0.10AE and [ 87 Sr 86 Sr ]I of 0.69914 ± 3. Internal isochron ages of two separate samples of rock 12004 yield ages of
V.Rama Murthy, N.M Evensen, Bor-Ming Jahn, M.R Coscio   +3 more
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A Rb-Sr ISOCHRON FOR THE SHAP GRANITE

Proceedings of the Yorkshire Geological Society, 1978
SUMMARY A Rb-Sr age of 394 ± 3 Ma has been determined from a 21–point isochron for the Shap Granite, which was probably emplaced in lower Devonian times. The determination provides a minimum age for the base of the Gedinnian Stage. K-Ar measurements on biotites and U-Pb measurements on zircons from the granite give similar ages.
A. J. WADGE, N. H. GALE, R. D. BECKINSALE, C. C. RUNDLE   +3 more
openaire   +1 more source

Rb-Sr age of stony meteorites

Geochimica et Cosmochimica Acta, 1965
Abstract A suite of samples of stony meteorites with a spread in Rb 87 Sr 86 ratios from about 0.02 to 3.0 has been analysed for Rb and Sr contents and Sr isotopic compositions. These whole-meteorite analyses all coincide within experimental error with a single isochron.
W.H Pinson, C.C Schnetzler, E Beiser, H.W Fairbairn, P.M Hurley   +4 more
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Revision of lunar Rb-Sr ages

Geochimica et Cosmochimica Acta, 1973
Abstract Becalibration of ‘spikes’ using stoichiometric Rb and Sr salts recently issued by the National Bureau of Standards shows that our determinations of the ratio 87 Rb 86 Sr in lunar samples have been low by 1.8 per cent, which we attribute to non-stoichiometry of the salts previously used for calibration, particularly RbCl.
J.R De Laeter, M.J Vernon, W Compston
openaire   +1 more source