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This paper gives an account of present geologic activities in the northernmost part of Sweden and, in particular, of some newer ideas concerning the geologic evolution of the area. From more detailed geologic mapping, as well as several age determinations, the following have been established: (1) the existence of a cratonic nucleus dated at 2,700 m.y., or a little more, with a thick cover of geosynclinal strata (Karelian type); (2) two phases of orogenic activity (marked by folding and emplacement of granite, diorite, and syenite) separated by a phase of acidic volcanic activity at around 1,635 m.y. ago; and (3) post-granitic deformation marked by shearing, brec-ciation, and block faulting.

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