Radiometrie dating of the serorogenic Svecokarelian Enkullen and Fjällberg granites, south central Sweden
- 1 March 1986
- journal article
- research article
- Published by Taylor & Francis in Geologiska Föreningen i Stockholm Förhandlingar
- Vol. 108 (1) , 73-77
- https://doi.org/10.1080/11035898609453751
Abstract
Radiometric dating of the serorogenic Svecokarelian Enkullen and Fjällberg granites, south central Sweden, yield two parallel Rb-Sr whole-rock isochron ages of 1755 ± 17 Ma and 1758 ± 14 Ma, respectively. The initial 87Sr/86Sr ratios arc also similar; 0.7063 + 0.0056 and 0.7065 ± 0.0034, respectively. A U-Pb dating of zircons from the Fjällberg granite also gives a corrsponding age, i.e., an upper intercept with concordia of 1748+74 -45 Ma. A recalculation of the zircons with the U-Pb model of Wickman (1983) yields an age of 1765 Ma. The agreement between the Rb-Sr and U-Pb datings strongly indicates that they represent true primary crystallizing ages.Keywords
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