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Rocca di Verra, Gobba di Rollin-Rocca di Verra ridge - Blu Lake area, Champoluc, Ayas, Ayas Valley, Aosta Valley, Italy

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 45° 53' 29'' North , 7° 44' 37'' East (est.)
Margin of Error:~0km
Other regions containing this locality:The Alps, Europe
Köppen climate type:Dfc : Subarctic climate
Name(s) in local language(s):Rocca di Verra, Catena della Gobba di Rollin-Rocca di Verra - area del Lago Blu (Chaîne de la Bosse de Rollin-Rocca di Verra - région du Lac Bleu), Champoluc, Ayas, Val d'Ayas, Valle d'Aosta (Vallée d'Aoste), Italia


More than 60 dykes and lenses of rodingite, mantled by thin chlorite walls and made up of diopside, grossular, epidote, vesuvianite, etc., are present in serpentinite at the base of the eastern slope of Rocca di Verra. The Rocca di Verra serpentinite is a magnetite-bearing antigorite serpentinite with lenses and veins rich in reddish titanclinohumite, diopside, and olivine (forsterite).

Furthermore, the Rocca di Verra serpentinite is cut by a NW-trending subvertical fault, marked by a strongly metasomatized, very hard fault breccia (listvenite), consisting of carbonatized serpentinite fragments within a matrix of calcite, Fe-bearing dolomite, quartz, and green Cr-rich mica (fuchsite), sometimes including submillimetric relics of chromite. This peculiar fault is linked to the post-metamorphic Aosta-Ranzola half-graben and related hydrothermal activity, which developed during the Oligocene (31-30 Ma) across the Austroalpine-Penninic nappe stack.


Mineral List


14 valid minerals.

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References

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Dal Piaz, G.V. (2004) From the European continental margin to the Mesozoic Thetyan Ocean: A geological map of the upper Ayas Valley (Western Alps). In: Pasquaré, G., Venturini C.,(Eds), Groppelli G., (Ass.t Ed.), Mapping Geology in Italy. APAT - Agenzia per la Protenzione dell'Ambiente e per i Servizi Tecnici, Dipartimento Difesa del Suolo - Servizio Geologico d’Italia, S.EL.CA., Firenze, pages 267-272.

 
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