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Rb/Sr isotope studies of Cretaceous granitoids in the central Chukchi region: correctness of geochronological interpretation of results
Authors:SV Efremov  SI Dril&#x;  GP Sandimirova  IV Sandimirov
Institution:a A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia
Abstract:The validity of the Rb/Sr isotopic ages of Cretaceous granitoid complex in the central Chukchi region has been verified. The performed studies showed that the Rb/Sr isotopic ages of late-orogenic granitoids are not reliable. Their variation can be explained in terms of the mixing of primary mantle magmas with continental-crust matter. Most probably, the variation is due to the constant compositions of mixing components and their proportions.
Keywords:granitoids  isotopic age  ultrapotassic basites
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