The Kongsberg Series margin and its major bend in the Flesberg area, Numedal, Buskerud.

Abstract

This major boundary is shown to be defined not by the traditional \"Friction Breccia\", but by a much earlier and more extensive mylonite zone. The mylonitisation was produced by a complex westward upthrust of the Kongsberg Series over the Telemark Series; both blocks had a common history thereafter. Spatial and chronological relationships between the upthrusting,, an extensive series of gabbroic intrusions and an increased heat flow, suggest association with major crust- mantle processes. The only major bend in the Kongsberg Series margin occurs in this area and in its location and development are explained.