VIA GEOALPINA: LEG 3 ALPE CURGEI - ALPE PIAN DI BOIT

punto di partenza

Alpe Curgei
28817 Miazzina VB
Italy
1350 m
Difficoltà: 
E
Lunghezza :  
10,70 km
Tempo di percorrenza :  
4 hours 15 min
Dislivello salita :  
675 m
Dislivello discesa :  
885 m

punto di arrivo

Alpe Pian di Boit
28817 Miazzina VB
Italy
1128 m

Profilo altimetrico

Punti di interesse

Between Cicogna and Pogallo the itinerary is equipped with didactic panels dealing with geological and naturalistic themes. The geological route, known as the “Pogallo Line”, represents a deeper exploration of the “Via GeoAlpina”. The route follows the Sutermeister Trail and mostly develops within metamorphic rocks of the geological unit called Strona-Ceneri area. It consists of two types of paragneiss, metamorphic rocks of sedimentary origin: the Gneiss Minuti (stop 1) and the Gneiss Ceneri (stop 2), both with Cambrian deposition age. They are interspersed with orthogneiss lenses (stop 3) deriving from granites intruded in the Ordovician period. All these rocks were transformed, around 340 million years ago, by the metamorphism associated with the Hercynian orogenesis when they descended to depths of at least 20 km and were affected by temperatures above 500° C. In the following Permian period (270 Mya) a strong magmatic activity led to the infiltration of granites into these formations, which were not involved in the events that later (about 90 Mya) led to the formation of the Alps. After crossing the wooden walkway (stop 4) the mylonites emerge: they are rocks produced by friction during the movement that took place along the Pogallo fault. In the last section before Pogallo, you cross kinzigiti (stop 5), rocks which are also metamorphic, nevertheless they do not belong to the “Serie dei Laghi”, but to the adjacent Ivrea-Verbano area.