Avalonia

Avalonia , or Avalonie is a Terrane Paléozoïque, drawing its name from the Péninsule of Avalon (Newfoundland), including current the Poland the North-West, the Germany of north, the Netherlands, the Belgium, the extreme north of the France, the England and the Wales, the southernmost Ireland, the south-eastern half of Newfoundland, the northern half of the Nova Scotia and are New England. One in general distinguishes Avalonia Western (current Newfoundland, Nova Scotia and New England) and Avalonia Eastern (current southernmost Ireland, England and Wales, Belgium, Netherlands, Nord-Pas-de-Calais, Picardy and the Ardennes, northern half of the Germany and the North-West of the Poland)

Geological history

At the end of the Protérozoïque, the ocean floor plunges under the Supercontinent Gondwana in a phenomenon of Subduction, creating the Orogénèse Cadomienne (650-550 my). One finds rocks of origin cadomienne hidden in all the south of the Great Britain. What becomes Avalonia separated from Gondwana approximately 490 million years ago, then joined the continent of Baltica, for finally, with this one, to enter in collision with the continent Laurentia to the Silurien and the Dévonien to form the Supercontinent Laurussia, during the orogenesis caledonienne. After the orogenesis Hercynien, which sees the collision of Gondwana against the southern margin of Laurussia, Avalonia belongs to supercontinent Pangée. With the Cretaceous , when the Pangée is dislocated, the grounds avaloniens are divided into two by the opening of the Atlantic Ocean.

Second assumption

However certain geologists think that only the Western part of Avalonia would have been detached it-there-have 490 my from Gondwana, and the oriental party according to whether after 40 million years, accompanied by the south-western part of the Iberian peninsula, in the form of the terrane of Avalon-Meguma-South-Portugal (source Ziegler 1990) , entering in collision with Laurussia during the orogenesis hercynienne.

Bonds

  • Geology of Jamestown (Rhode Island) (in)

  • Paleos (in)
  • University of the north of Arizona (in)

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