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Geology of the Alps
Tectonic subdivision
Helvetic Zone
Penninic nappes
Austroalpine nappes
Southern Alps
Formations & rocks
Bdner schist | flysch | molasse
Geological structures
Aarmassif | Dent Blanche klippe | Engadine window | Flysch zone | Giudicie line | Greywacke zone | Hohe Tauern window | Molasse basin | Penninic thrustfront | Periadriatic Seam | Ivrea zone | Lepontin dome | Rechnitz window | Rh?ne-Simplon line | Sesia unit
Paleogeografic terminology
Valais Ocean
Brian?onnais microcontinent
Piemont-Liguria Ocean
Apulian or Adriatic plate
The Alps form a part of a Tertiary orogenic belt of mountain chains, called the Alpide belt, that stretches through southern Europe and Asia from the Atlantic all the way to the Himalayas. This belt of mountain chains was formed during the Alpine orogeny. A gap in these mountain chains in central Europe separates the Alps from the Carpathians off to the east. Orogeny took place continuously and tectonic subsidence is to blame for the gaps in between.
The Alps arose as a result of the collision of the African and European tectonic plates, in which the western part of the Tethys Ocean, which was formerly in between these continents, disappeared. Enormous stress was exerted on sediments of the Tethys Ocean basin and its Mesozoic and early Cenozoic strata were pushed against the stable Eurasian landmass by the northward-moving African landmass. Most of this occurred during the Oligocene and Miocene epochs. The pressure formed great recumbent folds, or nappes, that rose out of what had become the Tethys Sea and pushed northward, often breaking and sliding one over the other to form gigantic thrust faults. Crystalline basement rocks, which are exposed in the higher central regions, are the rocks forming Mont Blanc, the Matterhorn, and high peaks in the Pennine Alps and Hohe Tauern.
The formation of the Mediterranean Sea is a more recent development and does not mark the northern shore of the African landmass.
Contents
1 Geologic boundaries of the Alps
2 Geologic structure of the Alps
2.1 Tectonic subdivision
2.2 Structural geology
2.3 Intrusions
2.4 Metamorphism
3 Tectonic history
3.1 Breakup of Pangea
3.2 Jurassic
3.3 Eo-Alpine phase in the Cretaceous
3.4 Paleocene and Eocene
3.5 Oligocene and Miocene
3.6 Neogene
4 Geomorphology
5 Geologic research
5.1 Geophysics
6 See also
7 References
7.1 External links
7.2 Literature
//
Geologic boundaries of the Alps
The Alps form a northward convex arc around their southeastern foreland basin, the Po River basin (to be precise the south is in fact their hinterland). Quarternary and Neogene sediments in this basin lie discordant over the southernmost thrust units. In the northeast southward dipping and internally thrusted Tertiary foreland deposits (flysch and molasse) are found. This Bavarian and Swiss foreland basin is called the Molasse Basin. The foreland basin deposits are overthrusted from the south by the thrustfront of the Alpine nappes. In Switzerland the Molasse Basin is rimmed to the northwest by the Jura mountains, an external fold-and-thrust belt, which can geologically be seen as part of the Alps. The western part of the Molasse basin forms the plateau of the Mittelland between the Alps and Jura Mountains. The Jura Mountains’ location is still a topic for debate. A possible tectonic factor is the north-south extensional Rhine graben to the north.
The Alps continue more or less smoothly into the following related Alpine mountain ranges: the Apennines to the southwest, the Dinarides to the southeast and the Carpathians to the northeast. In the east the Alps are bounded by the Viennese Basin and the Pannonian Basin, where eastest stretching of the crust takes place.
Geologic structure of the Alps
The Alps have a complex geology, but the general structure is the same as for other mountain ranges formed by continental collision.
Tectonic subdivision
The main suture (big shear zone) in the Alps is called the Periadriatic Seam and runs through the Alps from east to west. This is the boundary between materials from the (former) European and Apulian plates.
South of this line are folded and thrusted units of the Southern Alps.
North of the Periadriatic seam the three main nappe stacks of the Alps are found: the Helvetic, Penninic and Austroalpine nappes. This subdivision is more or less according to the paleogeographical origins of the rocks found in the units: the Helvetic nappes contain material from the European plate, the Austroalpine nappes material from the Apulian plate, the Penninic nappes material from the domains that existed in between the two plates.
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