The Variscan slate deposits
The European slate deposits are mainly situated in the Variscan
orogen within Early Paleozoic rock units. The Table gives a geographic and stratigraphic overview about the most important slate deposits, which will be described more detailed within the correspondig menues.
|A Terra Cha
||Lower Cambrian ("Candana Serie")
|Monte Rande, Los Oscos, Alto Bierzo, El
||Middle Ordovician ("Luarca Formation")
|Valdeorras, La Cabrera
||Middle- to Upper Ordovician
("Luarca Formation"/"Argüeira Formation"/
||Middle- to Upper Ordovician (?)
||Upper Precambrian to Lower Cambrian (Phyllite)
|Villar del Rey
||Lower-Ordovician to Middle-Devonian
||Middle Ordovician ("schistes de Anger")
||Lower Carboniferous (Kulm, "Formation
des schistes de Châteaulin")
Devonian ("Tredorn slates")
|Martelange (Luxem., Belgium)
||Lower-Devonian ("Mayener Schieferfolgen")
||Middle-Devon ("Fredeburger beds", "Asten
beds", "Flinz beds")
||Lower-Carboniferous ("Lehestener beds-Kulm")
||Upper-Ordovician to Lower Carboniferous
(Andelskohorkse- ,Moravske- und Hradecke beds)
The most important Variscan
slate deposits and their stratigraphic position.
The division of the Variscan and position of the slate deposits
The European slate deposits are concentrated in certain zones
within the Variscan. The slates, for example, of Saxony and Thuringia
are situated within the Saxothuringian Zone and in its continuation,
in the Lusitanian-Alcudia Zone as well as Ossa Morena Zone one
can find the slates of Villar del Rey.
The most important slate region is situated within the Leon-West Asturian Zone
and in the Galician-Castillian Zone. The Early-Paleozoic slates in the first
zone partly builds the counterpart to the Saxothuringian (Schönenberg & Neugebauer,
1987). The slates of Hunsrück, Mosel and Sauerland belong to the Rhenohercynian.
Towards east, the Moravian slates of the Nizky Jesinek lie in the Moravo-Silesian.
Slate provinces within the European
The Welsh slates are outside the Variscan
The french slate deposits of Maël-Carhaix and Anger lie
within the Armorican Massif of the North- and Central-Armorican-Zone.
Both zones are generally thought to be the continuation of the
Saxothuringian-Zone. In contrast, the South-Armorican-Zone is
considered to be the continuation of the Moldanubian-Zone. On
the other hand, the geological development of the North- and
Central-Armorican-Zone and the Saxothuringian-Zone are not comparable.
For example, the shelf environment of the Armorican Ordovician
is completely different from the deep water facies of the Ordovician
slates of the Saxothuringian-Zone (Pique et al., 1994). Hence,
the Saxothuringian-Zone is considered to run out westwards below
the Parisian basin and along the Bray fault (Lefort et al., 1994).