Abstract
The major crustal accretion episode in central and southern Scandinavia took place during the Svecokarelian orogeny (2100–1700 Ma) and the extensive postkinematic plutonism and volcanism explains the long duration.
The subsequent interorogenic period developed in a prevailing tensional regime, producing a basin and range type of crustal segment. Basin subsidence with extensive bimodal volcanism of rhyolitic and basaltic compositions, interlayered with shallow-water- and continental-type sediments evolved into aulacogen-like structures (the Telemark supra-crustals).
Extensive intrusions of granitoid and charnockitic plutons dominated large regions of southern Norway and southwestern Sweden during this period, with local deformation and metamorphism.
The Sveconorwegian orogeny (1200-850 Ma) was heralded by basic and intermediate intrusions, probably in response to tensional stresses created during the initiation of lithospheric subduction in connection with a period of crustal thinning. If the age of the Rjukan rhyolites is accepted as being 1200 Ma, and not 1500 Ma, the Telemark supracrustal trough may accordingly represent the earliest stages of the Sveconorwegian orogenic event, developed in a back-arc position in response to a N-S running plate collision zone to the west.
After 1150 Ma a compressional regime caused several periods of deep-seated plastic deformations and high-grade regional metamorphism.
Several episodes of massive invasions of granitoid magmas can be separated by the number of deformations they have suffered.
The prevailing structures define an asymmetrical N-S running orogenic belt, and the intrusions suggest a unilateral zonation with an intrusion dominated western core-zone in Vest-Agder and Rogaland, a central zone with a considerable amount of reworked rocks in Aust-Agder, Telemark, Bamble and 0stfold, which was gradually forced eastwards into a marginal zone of mega-tectonic imbricate structures of mega-units, separated by thrust zones and ultimately bordered by the Sveconorwegian Frontal Thrust Zone (SNFTZ) in SW Sweden equivalent to the Grenville Front in Canada. Upthrusting of large blocks and possibly crustal wedging into the mantle characterize this marginal zone of the Sveconorwegian orogeny. Oblique to this trend the Bamble linear belt forms a major shear-zone, repeatedly reactivated, ultimately controlling the site and shape of the Permian Oslo Rift.
Major postkinematic batholiths were emplaced in all zones, although the most pronounced is the Agder-Rogaland batholith belt. 800 Ma dyke-swarms indicate cratonic-like conditions and suggest rapid post-orogenic uplift and erosion in a stabilized crustal segment.
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© 1985 D. Reidel Publishing Company, Dordrecht, Holland
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Falkum, T. (1985). Geotectonic Evolution of Southern Scandinavia in Light of a Late-Proterozoic Plate-Collision. In: Tobi, A.C., Touret, J.L.R. (eds) The Deep Proterozoic Crust in the North Atlantic Provinces. NATO ASI Series, vol 158. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5450-2_18
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