论文信息 - The Rb—Sr age of the Ursand granite on the boundary between the Åmål and “Pregothian” mega-units of southwestern Sweden

The Rb—Sr age of the Ursand granite on the boundary between the Åmål and “Pregothian” mega-units of southwestern Sweden

Abstract The Rb-Sr age of the Ursand granite massif is 1250 ± 50 m.y. Within the limits of experimental error, this is identical with the Rb—Sr age of the Hastefjorden massif, situated close to the central axis of the Amal mega-unit in south-western Sweden. The age determination confirms that granites of the Hastefjorden group transgress the limits between the Amal and “Pregothian” mega-units. It also suggests that this event of granite formation has regional significance in parts of the south-western Baltic Shield.

E. Welin | R. Gorbatschev

[1] E. Welin,et al. The RbSr age of the Hästefjorden granite and its bearing on the Precambrian evolution of southwestern Sweden , 1976 .

[2] R. Gorbatschev. Fundamental subdivisions of Precambrian granitoids in the Åmål mega-unit and the evolution of the south-western Baltic Shield, Sweden , 1975 .

[3] W. Compston,et al. The statistical assessment of Rb‐Sr isochrons , 1966 .