View source for Bündner schist

{{geology of the Alps}}
[[Image:Mutilayer folds.JPG|thumb|300px|left|Isoclinally [[fold (geology)|folded]] Bündner schists with alternating green ([[Chlorite group|chlorite]] rich) and white ([[Dolomite (mineral)|dolomite]] rich) layers. Location: [[Adula nappe]], [[Lukmanier pass]] ([[Switzerland]]).]]
The '''Bündner schist''' or '''Bündner slate''' ({{langx|de|Bündnerschiefer}}; {{langx|fr|schistes lustrés}}) is a collective name for [[schistose]] rocks that form a number of [[geology|geologic]] [[Geologic formation|formations]] in the [[Penninic nappes]] of the [[Alps]]. Bündner schists were originally [[Marine (ocean)|marine]] sediments that underwent [[metamorphism]] at large depths.

The Bündner schists were deposited in the two small oceanic basins (the [[Valais Ocean]] and the [[Piemont-Liguria Ocean]]) that were located south of the European continent in the [[Mesozoic]] [[era]]. They formed a kilometers thick monotonous layer of dark [[clay]]s, [[marble]]s and sandy [[limestone]]s. These sediments were [[subduction|subducted]] to great depths during the [[Alpine orogeny]]. The resulting [[metamorphism]] and [[deformation (geology)|deformation]] turned them into calcareous [[phyllite]]s and [[schist]]s, strongly [[foliation|foliated]] rocks rich in [[mica]]s.

The Bündner schists can be found throughout the Penninic zone of the Alps, often forming zones of high [[strain (materials science)|strain]] between or large infolded [[syncline]]s (so called Mulde or Mulden) in the crystalline nappes that are made of more competent [[gneiss]].<ref>{{aut|Labhart, T.P.}}; 2005: ''Geologie der Schweiz'', Ott Verlag, {{ISBN|3-7225-0007-9}}; p. 89.</ref>

Bündner schists are often found along [[ophiolite]]s. The contacts between the two types of rock have always seen many phases of folding and are complex.

==References==
<references/>

{{DEFAULTSORT:Bundner Schist}}
[[Category:Geology of the Alps]]
[[Category:Geology of Switzerland]]
[[Category:Geology of Austria]]
[[Category:Geology of Germany]]