Piemont-Liguria Ocean

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Geology of the Alps

Tectonic subdivision
Helvetic Zone
Penninic nappes
Austroalpine nappes
Southern Alps
Formations & rocks
Bündner schist \| flysch \| molasse
Geological structures
Aarmassif \| Dent Blanche klippe \| Engadine window \| Flysch zone \| Giudicárie line \| Greywacke zone \| Hohe Tauern window \| Molasse basin \| Penninic thrustfront \| Periadriatic Seam \| Ivrea zone \| Lepontin dome \| Rechnitz window \| Rhône-Simplon line \| Sesia unit
Paleogeografic terminology
Valais Ocean
Briançonnais microcontinent
Piemont-Liguria Ocean
Apulian or Adriatic plate

The Piemont-Liguria basin or the Piemont-Liguria Ocean (sometimes only one of the two names is used, for example: Piemonte Ocean) was a former piece of oceanic crust that is seen as part of the Tethys Ocean. Together with some other oceanic basins that existed between the continents Europe and Africa the Piemont-Liguria Ocean is called the Western or Alpine Tethys Ocean.

[edit] Plate tectonic history

The Piemont-Liguria Ocean was formed in the Jurassic period, when the paleocontinents Laurasia (to the north, with Europe) and Gondwana (to the south, with Africa) started to move away from each other. The oceanic crust that formed in between the two continents became the Piemont-Liguria Ocean. In the Cretaceous period the Piemont-Liguria Ocean lay between Europe (and a smaller plate called the Iberian plate) in the northwest and the Apulian plate (a sub-plate of the African tectonic plate) in the southeast.

When the Apulian plate started moving to the northwest in the late Cretaceous, Piemont-Ligurian crust began to subduct beneath it. In the Paleocene the Piemont-Ligurian Ocean had completely disappeared under the Alpulian plate and continental collision started between Apulia and Europe, which would lead to the formation of the Alps and the Apennines in the Tertiary.

[edit] Remains

Fragments of Piemont-Ligurian oceanic crust were preserved as ophiolites in the Penninic nappes of the Alps and the Tuscan nappes of the Apennines. These nappes were subducted, sometimes to great depths in the mantle, before being obducted again. Due to the high pressures and temperatures at these depths, much of the material had been metamorphosed in the blueschist or eclogite facies.