Studies on the Lower Seve Nappe at Mount Areskutan, Sweden, using the fission track temperature age method

In a recent study we have measured the fission track temperature age of sphene from the Caledonian Lower Seve Nappe, Areskutan, Sweden. The resulting ages were Proterozoic, despite the so far dominating opinion that these tectonic units are of Cambro-Silurian origin and that they have been transported metamorphically in the Caledonian period. In order to establish this surprising finding a series of measurements was performed in the present investigation, all confirming our earlier results, i.e., the existence of two different generations of sphene in the Lower Seve Nappe. (author)