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K/Ar Dating of Clay-Mineral Alteration Associated with Ore Deposition in the Northern Part of the Oslo Region

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Petrology and Geochemistry of Continental Rifts

Part of the book series: NATO Advanced Study Institutes Series ((ASIC,volume 36))

Abstract

Twenty K/Ar isotopic ages are reported from 13 mines and prospects in the northern part of the Oslo region. Analyses of clay mineral concentrates from altered wallrocks give support for at least two distinct isotopic events. Upper Proterozoic ages are reported from Eidsvoll gold mines (663–788 Ma). Dates from the Midtskogen prospects located in the Precambrian basement and from altered igneous rocks at Skreia and Feiring reveal a distinct Permian event (237–277 Ma). Less well-marked events of Lower Ordovician and Triassic-Jurassic ages are, respectively, encountered in the Guldkis gold mine and in regional faults transecting Precambrian, Paleozoic, and Permian rocks.

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References

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Author information

Authors and Affiliations

  1. Geol. Inst. Univ. of Trondheim, Norway

    P. M. Ihlen

  2. Dept. of Geology, Univ. of Sheffield, England

    P. R. Ineson

  3. School of Physics the University Newcastle upon Tyne, England

    J. G. Mitchell

Authors
  1. P. M. Ihlen
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  2. P. R. Ineson
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  3. J. G. Mitchell
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Editor information

Editors and Affiliations

  1. Mineralogical-Geological Museum, University of Oslo, Oslo, Norway

    E.-R. Neumann

  2. Geological Institute, University of Oslo, Oslo, Norway

    I. B. Ramberg

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© 1978 D. Reidel Publishing Company, Dordrecht, Holland

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Ihlen, P.M., Ineson, P.R., Mitchell, J.G. (1978). K/Ar Dating of Clay-Mineral Alteration Associated with Ore Deposition in the Northern Part of the Oslo Region. In: Neumann, ER., Ramberg, I.B. (eds) Petrology and Geochemistry of Continental Rifts. NATO Advanced Study Institutes Series, vol 36. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9803-2_24

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  • DOI: https://doi.org/10.1007/978-94-009-9803-2_24

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-009-9805-6

  • Online ISBN: 978-94-009-9803-2

  • eBook Packages: Springer Book Archive

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