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Comba de la Sassa (Comba della Sassa; Sassa Valley), Bionaz, Valpelline, Aosta Valley, Italy

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 45° North , 7° East (est.)
Margin of Error:~5km
Other regions containing this locality:The Alps, Europe
Köppen climate type:ET : Tundra
Name(s) in local language(s):Comba de la Sassa (Comba della Sassa; Vallone della Sassa), Bionaz, Valpelline, Valle d'Aosta, Italia

Comba de la Sassa is a side valley in upper Valpelline, in which outcrops the mylonitic contact between Arolla and Valpelline units of Dent Blanche nappe. The former unit mainly consists of metagranitoids and less common paraschists; the latter consists of paragneisses, marbles, and metabasic rocks, with granulite-amphibolite facies assemblages.

Small leucocratic dykes are relatively frequent inside metagranitoids and include: quartz-plagioclase trondhjemites and fine- to medium-grained quartz diorites, with green hornblende, biotite, quartz, and more or less saussuritized plagioclase; pegmatites and aplites consisting of K feldspar, quartz, albite, micas, and accessory minerals (apatite, zircon, titanite, etc.)

Mineral List

17 valid minerals.

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Stutz, A.H. (1940): Die Gesteine der Arollaserie im Valpelline (Provinz Aosta, Oberitalien). Schweiz. Mineral. Petrogr. Mitt., 20, 117-246.
Pennacchioni, G., Guermani, A. (1993): The mylonites of the Austroalpine Dent Blanche nappe along the northwestern side of the Valpelline Valley (Italian Western Alps). Mem. Sci. Geol. Padova, 45, 37-55.
Dal Piaz, G.V., Bistacchi, A., Gianotti, F., Monopoli, B., Passeri, L., Schiavo, A., with contributions of Bertolo, D., Bonetto, F., Ciarapica, G., Dal Piaz, G., Gouffon, Y., Massironi, M., Ratto, S., Toffolon, G. (2015): Note illustrative della Carta Geologica d’Italia alla scala 1:50.000, Foglio 070 Monte Cervino. ISPRA, Serv. Geol. d'Italia - Regione Autonoma Valle d'Aosta/Région Autonome Vallée d'Aoste, Land Technology & Services, Treviso, 431 pp.

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