Abstract

The age values of lepidolites from South Africa and from Varuträsk as well as that of a microcline from Varuträsk have been determined and are discussed in connection with determination according to the potassium-argon method, applied to the same materials. A method is suggested which allows the spectrochemical determination of Rb and Sr with sufficient accuracy. The isotopic composition is determined by means of a Fabry-Perot etalon and hollow-cathode excitation, investigating the hyper-fine structure of the Sr line at 4078 A.

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