Cadomic orogeny

from Wikipedia, the free encyclopedia
Arathem system Beginning
( mya )
Modern Earth
Duration: 66 Ma
quaternary 2,588 Alpid
Neogene 23.03
Paleogene 66
Middle Ages
Duration: 186.2 Ma
chalk 145
law 201.3
Triad 251.9 Variscan
Paleozoic Earthen
Duration: 288.8 Ma
Perm 298.9
Carbon 358.9
Devon 419.2
Silurian 443.4 Caledonian
Ordovician 485.4
Cambrian 541 Cadomic
Duration: 459 Ma
Ediacarium 635
Cryogenium 720 various
rock formations
Tonium 1000
Duration: 600 Ma
Stenium 1200
Ectasium 1400
Calymmium 1600
Duration: 900 Ma
Statherium 1800
Orosirium 2050
Rhyacium 2300
Siderium 2500
Duration: 300 Ma
Duration: 400 Ma
Duration: 400 Ma
Duration: 400 Ma
Duration: 600 Ma
Please note that this table is only
intended to provide a rough overview. Information in the specialist literature at the beginning
and end of a particular orogenesis may
differ from the information in the table. a. because there are
different concepts and definitions depending on the region and author .

The Cadomian Orogeny (also Assyntische orogeny ) is an orogenic phase which during the late Neoproterozoic approximately 650 to 550 million years ago on the northern edge of Gondwana (later) and on the eastern edge of Baltica to form an accretion Orogen resulted.

In the areas with Cadomian folds, Sub- Cambrian layers lie at a discordant angle over folded Proterozoic layers.

The name Cadomia only refers to a part of the folded regions on the edge of northern Gondwana ( Armorika , Saxothuringian and Tepla-Barrandian units, but not Avalonia ). In this cadomic folded area of ​​northern Gondwana there was a strong rift formation in the early Paleozoic and in the course of the Ordovician and Silurian the microcontinent Avalonia and the meanwhile fragmented Armorika Terrang group broke off one after the other. Later, during the Caledonian and Variscan orogeny, these microcontinents were to be welded to the northern continents Baltica and Laurentia and form the present day foundation of western and central Europe and parts of the east coast of North America.

Orogeny is named after Cadomus , the Latin name of the northern French city of Caen . The term discordance cadomienne was first used by Léon Bertrand in 1921.

Pan-African Orogeny

Pan-African orogeny occurred around the same time as Cadomian orogeny . In part, Cadomian orogeny is understood as a regional expression of Pan-African orogeny. However, the Cadomian orogeny was more of an Andinotype mountain formation on the periphery of Gondwana, while the Pan-African orogeny was an alpinotype mountain formation with a collision of several small continents - the actual amalgamation of the great southern continent of Gondwana or the supercontinent of Pannotia .


  • Roland Walter : Geological history, the formation of the continents and oceans. 5th ed., 325 pp., De Gruyter, Berlin & New York. ISBN 3-11-017697-1
  • Lexicon of Geosciences. First volume A to Edi. 500 p., Spektrum Akademischer Verlag, Heidelberg & Berlin 2000. ISBN 3-8274-0299-9

Web links

Individual evidence

  1. Ulf Linnemann, Rolf L. Romer (Ed.): Pre-Mesozoic Geology of Saxo-Thuringia: From the Cadomian Active Margin to the Variscan Orogen. Swiss beard, Stuttgart 2010.
  2. Ulf Linnemann: Ediacaran rocks from the Cadomian basement of the Saxo-Thuringian Zone (NE Bohemian Massif, Germany): age constrains, geotectonic setting and basin development. In: Patricia Vickers-Rich and Patricia Komarower (Eds.): The Rise and Fall of the Ediacara Biota . Geological Society, London, Special Publications. Vol. 286, 2007, pp. 35-51
  3. Ulf Linnemann, Richard d'Lemos, Kerstin Drost, Teresa Jeffries, Axel Gerdes, Rolf L. Romer, Scott D. Samson, Rob A. Strachan: Cadomian tectonics. Pp. 103-154 in: Tom McCann (Ed.): The Geology of Central Europe. Volume 1: Precambrian and Palaeozoic. The Geological Society, London 2008, ISBN 978-1-86239-245-8 , p. 103.