Rb/1bSr isochrons for the granitic plutons around Farsund,southern Norway |
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Authors: | Svend Pedersen Torgeir Falkum |
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Institution: | 1. Institut for Almen Geologi, Københavns Universitet, København Denmark;2. Geologisk Institut, Aarhus Universitet, Aarhus Denmark |
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Abstract: | The granitic and charnockitic intrusions in the Precambrian migmatites around Farsund in southern Norway have previously been shown to be successively intruded as well as being geochemically different. Rb- and Sr-isotope data support the conclusion that they are intruded with a separate time interval and that the Farsund charnockite is younger (852±41 m.y.) than the Lyngdal hornblende granite (932±38 m.y.). Furthermore, the different initial ratios (0.7128 and 0.7054, respectively) disprove a comagmatic origin unless large-scale contamination has occurred. |
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