Isotopic age determinations in Bergslagen, Sweden: VII. The Fellingsbro-type Granite east of Kopparberg

  • I.S. Oen Geologisch lnstituut Universiteit van Amsterdam, Nieuwe Prinsengracht 130, 1018 VZ Amsterdam, The Netherlands
  • R.H. Verschure ZWO-Laboratorium voor Isotopen-Geologie, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands

Abstract

Rb-Sr whole-rock analysis of seven samples of the Fellingsbro-type Younger Granite east of Kopparberg gives an age of 1715 ± 50 Ma and an initial 87Sr/86Sr ratio of 0.7046 ± 0.0026 (errors 95% confidence level). This age falls in the age range determined for the Younger Granites of the Värmland-Småland, Dala and Fellingsbro Groups, 1.74-1.64 Ga. Reliable age data from from the Malingsbo-type granites in the Kopparberg area are still lacking, however, so it is uncertain whether they can be included in the Fellingsbro Group of Younger Granites

Published
1985-01-01
How to Cite
I.S. Oen, & R.H. Verschure. (1985). Isotopic age determinations in Bergslagen, Sweden: VII. The Fellingsbro-type Granite east of Kopparberg. Netherlands Journal of Geosciences, 385-388. Retrieved from https://njgjournal.nl/index.php/njg/article/view/13204
Issue
Volume 64 - 1985
Section
Regular paper

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