Cadomic orogeny

Arathem	system	Beginning ( mya )	Orogenesis
Cenozoic Modern Earth Duration: 66 Ma	quaternary	2,588	Alpid orogeny
	Neogene	23.03
	Paleogene	66
Mesozoic Middle Ages Duration: 186.2 Ma	chalk	145
	law	201.3
	Triad	251.9	Variscan orogeny
Paleozoic Earthen Period Duration: 288.8 Ma	Perm	298.9
	Carbon	358.9
	Devon	419.2
	Silurian	443.4	Caledonian orogeny
	Ordovician	485.4	Caledonian orogeny
	Cambrian	541	Cadomic orogeny
Neoproterozoic Jungproterozoikum Duration: 459 Ma	Ediacarium	635	Cadomic orogeny
	Cryogenium	720	various Precambrian rock formations
	Tonium	1000
Mesoproterozoic Mittelproterozoikum Duration: 600 Ma	Stenium	1200
	Ectasium	1400
	Calymmium	1600
Paleoproterozoic Altproterozoikum Duration: 900 Ma	Statherium	1800
	Orosirium	2050
	Rhyacium	2300
	Siderium	2500
Neo-Archaic Duration: 300 Ma		2800
Mesoarchean Duration: 400 Ma		3200
Paleoarchean Duration: 400 Ma		3600
Eoarchic Duration: 400 Ma		4000
Hadaikum Duration: 600 Ma		4600
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 .

literature

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

The Geological and Tectonic Framework of Europe by JA Plant, A. Whittaker, A. Demetriades, B. De Vivo and J. Lexa ( Memento of May 4, 2007 in the Internet Archive )

Individual evidence

↑ 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.
↑ 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
↑ 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.

[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.