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Variscan or Hercynian or Armorican orogeny, LOCATION, FORMED BY, Composed…
Variscan or Hercynian or Armorican orogeny
Location
Portugal, western Spain, southwestern Ireland, southwestern England, France, Germany, Sardinia, Ardennes and Czech Republic
How?
plate-tectonic processes, including:
sea floor spreading
,
continental drift
&
collision of plates
click here
Extensive thrusting
= thickening of the continental crust & formation of a Tibetan-style plateau
The Armorican orogeny
the collision of
Eurasian
and
African
tectonic plates
During the
Armorican foldings
sedimantary rocks had been changed in
Munster
and Ireland were folded to form of
ridges of sandstones and valleys of limestones
northwest of France,including Brittany,the western part of Normandy
and the the Pays de la Loire
name comes from the old Armorica
metamorphic and magmatic rocks
old rocks have been eroded to a plateaulike paneplain
highest peak Mont des Avaloirs 417 m
Type of Rocks
Ophiolites
(Harz, Germany),
sandstones
,
limestones
(England),
pillow lavas
,
gabbros, basalt
famous plateau:
Massif Central
-
granite
coal
(Silesia & Massif Central)
Variscan orogeny
Time of origin
419
to
299 million years ago
created supercontinent
Pangea
(250 million years ago)
Important industrial minerals and ores
Lead
,
zinc
(Ireland, England, Poland, eastern Germany, Silesia and south western Spain) and
copper
(Silesia and south western Spain)
LOCATION
FORMED BY
Composed of
