Abstract
Caledonian deformation of the Precambrian basement in southeastern Norway
Highlights
The distance of thrusting of the Middle and Lower allochthons in the central part of the Caledonian Orogen has been discussed since the time of Törnebohm’s famous 1888 paper and his map from the central part of Scandinavia (Törnebohm, 1896). Törnebohm (1888) based his tectonic model on the same profile crossing Åreskutan as in Gee et al (2010) more than 120 years later and estimated the transport distance for the Middle Allochthon to be in the order of 100 km
Different estimates for the transport distance of the thrusting of the Lower Allochthon based on shortening of the Osen–Røa Nappe Complex have been published by Morley (1986) and Lamminen et al (2011) and references therein
In this paper we look at the relationship between the thrusting of the Middle Allochthon and the Lower Allochthon with the basement windows
Summary
The distance of thrusting of the Middle and Lower allochthons in the central part of the Caledonian Orogen has been discussed since the time of Törnebohm’s famous 1888 paper and his map from the central part of Scandinavia (Törnebohm, 1896). Törnebohm (1888) based his tectonic model on the same profile crossing Åreskutan as in Gee et al (2010) more than 120 years later and estimated the transport distance for the Middle Allochthon to be in the order of 100 km. Different estimates for the transport distance of the thrusting of the Lower Allochthon based on shortening of the Osen–Røa Nappe Complex have been published by Morley (1986) and Lamminen et al (2011) and references therein. The involvement of the basement on the Fennoscandian Shield was probably important for the transport of the Hedmark Basin out of its several km-deep rift structure into an overturned antiform during the thrusting of the Osen–Røa Nappe Complex. The geology of the southeastern Norway is composed of a Mesoproterozoic basement with autochthonous Cambrian metasedimentary rocks above This sequence is cut by Caledonian nappes
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