Abstract
Rb-Sr whole-rock isochrons are reported for the Hälleviksstrand amphibolite (1432 ± 92 Ma) and the Assmunderöd-Myckleby augen granite (1379 ± 46 Ma) which intrude the Stora Le—Marstrand migmatite belt of Orust, SW Sweden. These ages provide a younger limit for the age of the main migmatisation and an older limit for the emplacement of minor silicic and mafic intrusions and subsequent regional metamorphism and deformation. They overlap with published ages from granitic intrusions in the adjacent Åmål belt and provide the basis for a correlation between the two belts.
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