Taconic orogeny

The Taconic orogeny on the border of Ordovician to Silurian ( 444 mya order ) is the first phase of the epoch of Caledonian orogeny in the Acadischen Gebirgsbildungsära.

It took place in tropical latitudes during the formation of the supercontinent Pangaea Laurussias and especially on the east coast Laurentias, the North America today, and today is detectable mainly in the strata of the Appalachians.

The Taconic Mountains were formed by postponing the damage caused by the seafloor spreading of the Iapetus Ocean - volcanic island arc on the craton or continental core Laurentias. This development is similar to the current situation of the Japanese islands on the Pacific Ring of Fire.

In Avalonia and Baltica, the precursors of modern Europe, there has been in this phase of mountain building only tiny folds of the lithosphere.

In Rheischen ocean was born just south of Avalonia, Armorica Perunica and by 420 mya also a volcanic island chain - the Hun Terrane - which, however, "soon" again disappeared in a deep-sea basins or sediment basin during the Northern Gondwana's movement. Parts of these islands were lifted at the alpidischen orogeny and today form layers in the folds of the Central Alps.

The southern Gondwana supercontinent and Asian cratons were geologically quiet at this time.

Later (390 mya ) was the subduction of the Iapetus under the continental plates and their collision in the phases of the Acadian, and then the Variscan orogeny Alleghenischen.

Links, sources

  • Shale deposits of the Caledonian - Appalachian Orgone
  • Shade of ancient continents
  • Maps of Paleomar project
  • Building New England - The Taconic and Acadian Orogenies
  • Orogeny
760439
de