Traces of The Eo-Alpine Orogenic Phase
Before the formation of the Alps in the lower and middle Tertiary period, the Austroalpine rocks experienced another deformation phase: the Eo-Alpine phase of mountain building that took place in the Cretaceous. The metamorphic field gradient is to the east-south-east, so in a west-north-western direction, the traces become less severe. In the west of Switzerland, the event cannot be recognized anymore. In Austria, however, Eo-Alpine eclogite lenses occur close to the Hohe Tauern window.
The Eo-Alpine phase is sometimes seen as the earliest phase of the Alpine orogeny. However, after the initial mountain-building, the tectonic plates moved away from each other. The next phase was more than 50 Ma later, so the events are often seen as unrelated.
Read more about this topic: Austroalpine Nappes
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