Determination of Rb/Sr and 87Sr86Sr ratios of some standard rocks and evaluation of X-ray fluorescence spectrometry in Rb1bSr geochemistry

✍ Scribed by R.J. Pankhurst; R.K. O'Nions

• Book ID: 115812985
• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 506 KB
• Volume: 12
• Category: Article
• ISSN: 0009-2541
• DOI: 10.1016/0009-2541(73)90110-1

✦ Synopsis

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 Rb-Sr geochronology.

a~Sr/a6sr ratios have been determined on G-2, GSP-1, BCR-1 and AGV-1 as well as the Eimer and Amend SrCO 3 standard.