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Location of the Hercynian-Alleghenian mountain belts in the middle of the Carboniferous period.Present day coastlines are indicated in grey for reference. [1]The Variscan orogeny, or Hercynian orogeny, was a geologic mountain-building event caused by Late Paleozoic continental collision between Euramerica (Laurussia) and Gondwana to form the supercontinent of Pangaea.
During the Sudetic (main) phase of the Hercynian orogeny (330-320 million years ago, Late-Visean and Namurian/Serpukhovian) compressional tectonics had the upper hand again. In the Namurian age full-scale continental collision between Laurussia and Gondwana resulted in the destruction of the last oceanic crust of the basin. Its sedimentary fill ...
The Saxothuringian Zone, Saxo-Thuringian zone [2] or Saxothuringicum is in geology a structural or tectonic zone in the Hercynian or Variscan orogen (380-270 million years old) of central and western Europe. Because rocks of Hercynian age are in most places covered by younger strata, the zone is not
Variscan orogeny, also known as Hercynian orogeny – Collision of ... Mississippian age (345 Ma) Sonoma orogeny – period of mountain building in western ...
The Alleghanian orogeny, a result of three separate continental collisions. USGS. The immense region involved in the continental collision, the vast temporal length of the orogeny, and the thickness of the pile of sediments and igneous rocks known to have been involved are evidence that at the peak of the mountain-building process, the Appalachians likely once reached elevations similar to ...
In older rocks from the lower crust intrusions are found that formed during or just after the Hercynian orogeny. These intrusions are older than the Alps and have nothing to do with their formation. Radiometric age determination yields ages around 320 Ma. Slightly younger felsic intrusions formed by Permian and Triassic extension can also be found.
The whole sequence was deformed, metamorphosed and intruded by felsic magmas during the Hercynian orogeny. The massif is cut in three by two major late Hercynian southeast-northwest striking shear zones (the North and South Armorican Shear Zones). The divisions are simply called the North, Central and South Armorican Zones. Generally the north ...
Geologically the Rhenish Massif consists of metamorphic rocks, mostly slates (hence its German name), deformed and metamorphosed during the Hercynian orogeny (around 300 million years ago). Most of the massif is part of the Rhenohercynian zone of this orogeny, that also encompasses the Harz further east and Devonian rocks of Cornwall ...