TEKTONIKK

The map-sheet Båtsfjord covers an area belonging geologically to the Barents Sea Region. Two major lithostratigraphic units occur within the confines of the map-sheet: the Lokvikfjellet and the Barents Sea Groups, with the former overlying the latter along an angular unconformity. The age of both groups is Late Proterozoic. The rocks in the area were metamorphosed at a very low grade during the Caledonian orogeny. The tectonic structure of the area is comparatively simple, characterized by Ne-SW trending folds with approximately vertcal axial planes.

Three principal geological and tectonostratographic divisions of the bedrock can be recognised within the are of map-sheet Nordkapp: 1) the Kalak Nappe Complex, 2) the Magerøy Nappe, and 3) the Skarsvåg Nappe. All three nappe units form part of the Caledonian fold belt, but their internal strucutral deformation and thrusting occurred at different times during the protracted Caledonian orogenic cycle. The tectonic structures and metamorphic parageneses occurring in the different nappes are described in some detail, and short accounts are given on fossil occurrences, radiometric age determinations and aspects of economic geology. Aeromagnetic and gravity anomalies are present within the map-area, both on land and offshore, and the posiible sources of these anomalies are discussed in relation to the known geological and structural features of the region.

The main tectonostratigraphic units within the Melvær and Askvoll map-areas are: Precambrian basement rocks, allochthonous Precambrian charnokitic- mangeretic rocks of the Dalsfjord Nappe; allochthonous mainly Cambro-Silurian rocks of the Stavfjord Nappe; Devonian sedimentarty rocks. A description of the different rock types are given. Brief descriptions are also given of the tectonic structures occurring in the area and of the metamorphism of the different units. The Dalsfjord Nappe was thrust towards the south-east, probably in Early Ordovician time, and was strongly eroded before thrusting of the Stavfjord Nappe took place in the Late Silurian. The Stavfjord Nappe was thrust towards the south-east as a major asymmetric anticline - the Stavfjord Anticline - with an axial plane dipping about 40 degrees towards the north-west. A general description is given of some ore and building- stone occurrences.

This is a review of the structural and tectonic evolution of the Old Red Sandstone (ORS) of Svalbard put into the context of current regional geological understanding. The Svalbardian Orogenic Event, starting in the late Famennian and culminating in the Tournaisian, is emphasized and discussed in the regional context of the Ellesmerian Orogeny.

Neotektonikk er studiet av bevegelser og deformasjon av jordskorpen, som er nåværende eller nyere i geologisk tid. Kartet viser jordskjelv, fokalmekanismer, spenningsmålinger, postglasiale forkastninger, landhevning, submarine skred, vulkaner, oppløft/erosjon og sedimentavleiring i det norske område. (Neotectonics is the study of motion and deformation of Earth's crust that are current or recent in geological time. The map displays earthquakes, focal mechanisms, stress observations, postglacial faults, glacial isostatic adjustment, submarine slides, volcanoes, uplift/erosion and sediment deposition in Norway and adjacent areas.) Kartet også vedlagt i NGU-rapport 2018.010

- NGU skulle ta på seg en geologisk kartlegging med sikte på utarbeidelse av et generelt geologisk og tektonisk oversiktskart i målestokk 1:100 000. - Tidligere geologiske materiale ble innsamlet, og supplert med feltarbeid.

Tunnelen vil over store strekninger gå langs med bergartenes strøkretning, (skifrighetsretning) og skifrigheten vil her ha et fall på 30-50 grader mot N.