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Preliminary results of K-Ar and Rb-Sr age determinations of the Ottfjället dolerites give K-Ar ages ranging from 650 to 2600 Ma and a Rb-Sr whole-rock isochron age of 735±260 Ma. The latter age is interpreted as the age of the dolerite intrusion. It is also suggested that the high K-Ar ages are due to excess Ar.
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