• Dating explosive volcanism perforating the Precambrian basement in southern Norway. 

      Andriessen, P.A.M.; Boelrijk, N.A.I.M.; Hebeda, E.H.; Verschure, R.H.; Priem, H.N.A.; Verdurmen, E.A.Th.; Maijer, C. (NGU (380), Journal article, 1983)
      K-Ar and Rb-Sr dating have been performed on various hypabyssal diatreme-facies volcanic rocks perforating the Sveconorwegian zone of the Precambrian basement in southern Norway. The dated rocks were taken from the Fen ...
    • Isotope geochronology in the high-grade metamorphic Precambrian of southwestern Norway: new data and reinterpretation. 

      Wielens, J.B.W.; Verschure, R.H.; Verdurmen, E.A.Th.; Priem, H.N.A.; Hebeda, E.H.; Boelrijk, N.A.I.M.; Andriessen, P.A.M. (NGU (359), Journal article, 1980)
      A new series of isotopic age data is reported from the high-grade metamorphic Precambrian in S.W. Norway, mainly from the Sirdal-Ørsdal area. U-Pb investigations on suites of zircons from three augen gneisses and a pyroxene ...
    • Isotope geochronology of the Eidfjord Granite, Hardangervidda, West Norway. 

      Priem, Harry N.A.; Verschure, R.H.; Verdurmen, E.A.Th.; Hebeda, E.H.; Boelrijk, N.A.I.M. (NGU (327), Journal article, 1976)
      The Eidfjord Granite has a 7-point whole-rock Rb-Sr isochron age of 931 +- 35 Ma with initual 87Sr\/86Sr = 0.7058 +- 0.0028 (50.0 X (10)9 year 87Rb half life; errors at 95 per cent confidence level). Two separated biotites ...
    • Isotopic evidence on the age of the Trysil porphyries and granites in eastern Hedmark, Norway. 

      Verschure, R.H.; Boelrijk, N.A.I.M.; Hebeda, E.H.; Verdurmen, E.A.Th.; Priem, H.N.A. (NGU (266), Journal article, 1970)
      Rocks from the (sub-Jotnian) acidic plutonic and volcanic basement complexes in the Trysil area, eastern Hedmark, yield a Rb-Sr isochron age of 1541+-69 million years. This agrees within the limits of error with the isochrom ...