Kaledonisk tektonik i Jämtland

Abstract

Recent investigations in the Swedish Caledonides have proved the existence of a series of NW. striking transform faults. They are relatively broad and are in the nature of deep zones of movement in the parautochthonous basement. Stratigraphical differences between the blocks delimited by faults demonstrate vertical movements in the faults at latest Precambrian and early Silurian. To the west the transform faults disappear or are re-orientated at the line of large culminations. A hypothesis is presented that the parautochthonous zone with transform faults constitutes a large Caledonian slice in the crust, the zone with “horsts” forms a more westerly second crustal slice, etc. In accordance with this, some geophysical relationships are discussed.