Orthogonal joint systems in the Bergen area, southwest Norway, and their regional significance

Physics

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Scientific paper

Joint orientation measurements are reported from the Bergen district, southwest Norway. The prevailing joint systems form two near-vertical, near-orthogonal sets, striking preferentially NW-SE and NE-SW. The orientation of these fissure systems is consistent with fissure systems dissecting the surface formations (Precambrian to Quaternary) throughout Britain and northwest France. They also show general agreement with lineaments in southern Norway as revealed by Landsat imagery. It is suggested that the orthogonal joint network represents a fundamental tectonic structure, originally implanted into the mobile outer layer of the Earth in Precambrian time. The network has been repeatedly reactivated throughout the Earth's dynamic/tectonic history. It was probably formed in a shear regime caused by torsional deformation associated with rotation of large-scale `lithospheric' units, which is still operating today.

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