Determination of Rb/Sr and ratios of some standard rocks and evaluation of X-ray fluorescence spectrometry in Rb1bSr geochemistry |
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Authors: | RJ Pankhurst RK ONions |
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Institution: | Department of Geology and Mineralogy, University of Oxford, Oxford Great Britain |
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Abstract: | New isotope dilution results are presented for Rb and Sr concentrations in U.S.G.S. standard rocks and NBS-70a K-feldspar. The results (based on at least five analyses of each rock), are generally accurate to ± 0.5% and resolve discrepancies in previously published data. X-ray fluorescence analyses of the same samples yield Rb and Sr determinations which are only accurate to ± 5%, but Rb/Sr ratios which are as precise and in excellent agreement with the isotope dilution values. It is concluded that X.R.F. determination of Rb/Sr ratios is perfectly suitable for whole-rock Rb1bSr geochronology. ratios have been determined on G-2, GSP-1, BCR-1 and AGV-1 as well as the Eimer and Amend SrCO3 standard. |
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