Browsing NGU Open Archive by Author "Askvik, Helge"
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A probable Permian hydrothermal alteration age for a quartz syenite dyke from Stabben, Nordmøre.
Sturt, Brian A.; Sundvoll, Bjørn; Askvik, Helge (NGU Bulletin (432), Journal article, 1997)A Rb-Sr whole-rock isochron from a quartz-syenite dyke at Stabben, Nordmøre, has provided an age of 263 +- 6Ma. This could be taken to indicate a crystallisation age for the dyke, i.e. Early Permian. The age, however, does ... -
Gabbroic and quartz dioritic intrusions in gneisses on southern Askøy, West Norwegian Caldonides.
Askvik, Helge (NGU (270), Journal article, 1971)Light- and dark-coloured biotite gneisses and in part amphibole gneisses, of supracrustal origin have been intruded by a Precambrian basic pluton. Later a quartz diorite was intruded into the basic rocks. By assimilation ...