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Svecofennian orogeny

Geological map of the Scandinavian Peninsula and Fennoscandia: the Svecofennian orogen is shown in yellow. The blue areas to the west are the Transscandinavian Igneous Belt. The nappes emplaced by the much younger Caledonian orogeny are shown in light green.

The Svecofennian orogeny[note 1] is a series of related orogenies that resulted in the formation of much of the continental crust in what is today Sweden and Finland plus some minor parts of Russia. The orogenies lasted from about 2000 to 1800 million years ago during the Paleoproterozoic Era. The resulting orogen is known as the Svecofennian orogen or Svecofennides.[3] To the west and southwest the Svecofennian orogen limits with the generally younger Transscandinavian Igneous Belt.[4] It is assumed that the westernmost fringes of the Svecofennian orogen have been reworked by the Sveconorwegian orogeny just as the western parts of the Transscandinavian Igneous Belt has.[5] The Svecofennian orogeny involved the accretion of numerous island arcs in such manner that the pre-existing craton grew with this new material from what is today northeast to the southwest. The accretion of the island arcs was also related to two other processes that occurred in the same period; the formation of magma that then cooled to form igneous rocks and the metamorphism of rocks.[3]

  1. ^ Högdahl, K.; Andersson, U.B.; Eklund, O. (2004). "The Transscandinavian Igneous Belt (TIB) in Sweden: a review of its character and evolution (foreword)". Geological Survey of Finland, Special Paper. 37: 3–4.
  2. ^ Lundqvist et al., p. 49
  3. ^ a b Baltybaev, Sh.K. (2013). "Svecofennian Orogen of the Fennoscandian Shield: Compositional and Isotopic Zoning and Its Tectonic Interpretation". Geotectonics. 47 (6): 452–464. Bibcode:2013Geote..47..452B. doi:10.1134/s0016852113060022. S2CID 129418672.
  4. ^ Gorbatschev, R. (2004). "1. The Transscandinavian Igneous Belt - introduction and background". In Högdahl, K.; Andersson, U.B. & Eklund, O. (eds.). The Transscandinavian Igneous Belt (TIB) in Sweden: a review of its character and evolution. Geological Survey of Finland, Special Paper 37. pp. 9–15.
  5. ^ Gorbatschev, Roland; Bogdanova, Svetlana (1993). "Frontiers in the Baltic Shield". Precambrian Research. 64 (1–4): 3–21. Bibcode:1993PreR...64....3G. doi:10.1016/0301-9268(93)90066-b.


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