NGU Norges Geologiske Undersøkelse Geolological Survey of Norway
NGU Norges geologiske undersøkelse Geolological Survey of Norway Bulletin 440 MISCELLANEOUS RESEARCH PAPERS Trondheim 2002 Printed in Norway by Grytting AS Contents Timing of late- to post-tectonic Sveconorwegian granitic magmatism in South Norway .............................................................................................. 5 TOM ANDERSEN, ARILD ANDRESEN & ARTHUR G. SYLVESTER Age and petrogenesis of the Tinn granite,Telemark, South Norway, and its geochemical relationship to metarhyolite of the Rjukan Group ............................. 19 TOM ANDERSEN, ARTHUR G. SYLVESTER & ARILD ANDRESEN Devonian ages from 40Ar/39Ar dating of plagioclase in dolerite dykes, eastern Varanger Peninsula, North Norway ......................................................................... 27 PHILIP G. GUISE / DAVID ROBERTS Mid and Late Weichselian, ice-sheet fluctuations northwest of the Svartisen glacier, Nordland, northern Norway ................................................................................. 39 LARS OLSEN Instructions to authors – NGU Bulletin .................................................................... xx TOM ANDERSEN,ARILD ANDRESEN & ARTHUR G.SYLVESTER NGU-BULL 440, 2002 - PAGE 5 Timing of late- to post-tectonic Sveconorwegian granitic magmatism in South Norway TOM ANDERSEN, ARILD ANDRESEN & ARTHUR G. SYLVESTER Andersen, T., Andresen, A. & Sylvester, A.G. 2002: Timing of late- to post-tectonic Sveconorwegian granitic magma- tism in South Norway. Norges geologiske undersøkelse Bulletin 440, 5-18. Dating of late- to post-tectonic Sveconorwegian granitic intrusions from South Norway by the SIMS U-Pb method on zircons and by internal Pb-Pb isochrons on rock-forming minerals indicates a major event of granitic magmatism all across southern Norway in the period 950 to 920 Ma. This magmatic event included emplacement of mantle- derived magma into the source region of granitic magmas in the lower crust east of the Mandal-Ustaoset shear zone, and formation of hybrid magmas containing crustal and mantle-derived components.
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