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Some technical aspects of the Rb-Sr geochronology which is undertaken at our Department are briefly described. Attentions are paid to the isotopic fractionation of Rb and Sr in the mass spectrometric ...measurements. It has been confirmed that the main time variation in the isotope ratio principally follows the Rayleigh distillation mechanism. However, in the actual measurements, various types of fractionations were observed which probably include the simultaneous simple processes of fractionation such as exchange reaction, diffusion and Rayleigh distillation. Examples of Rb-Sr geochronology of some metamorphic rocks are also given.続きを見る
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