Mélange dell'Alpe Tamia-Campo

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Darstellung und Status

Farbe CMYK
Farbe RGB
R: 245 G: 245 B: 195
lithostratigraphische Formation
Element ist in Gebrauch
informeller Begriff


Mélange de l'Alpe Tamia-Campo
Mélange dell'Alpe Tamia-Campo
Alpe Tamia-Campo Mélange
Herkunft des Namens

Alpe Tamia (Italia), WSW Pizzo Mèdola

Historische Varianten

Alpe Tamia–Campo wildflysch with blocks of marble (Matasci et al. 2011 p.266)

Hierarchie und Abfolge


Geographische Verbreitung
Lepontin: Alpe Tamia, Basodino, Campo.


Matasci Battista, Epard Jean-Luc, Masson Henri (2011) : The Teggiolo zone: a key to the Helvetic–Penninic connection (stratigraphy and tectonics in the Val Bavona, Ticino, Central Alps). Swiss J. Geosci. 104, 257–283

p.266: 3.5.2 The Alpe Tamia–Campo wildflysch with blocks of marble

This wildflysch forms the lower half of the Robièi formation in a zone that extends from Alpe Tamia (Italy, WSW of the P. Mèdola), through the steep southern and eastern slopes of the Basodino peak (Carreras and Jequier 2002), down to the surroundings of Campo. Most of the blocks are made of a white, pure calcitic marble, identical to the Sevinèra marble. More rarely they are yellowish or even brownish and made of more or less quartzic and micaceous limestone; in these cases the similarity is with the yellow member of the Sevinèra marble. The first blocks are small and appear a few meters or decameters above the top of the Mèdola quartzite. Their size can be as small as a few cm, like pebbles, but more frequently they are dm- to m-wide and have a lenticular shape (Fig. 4). In its lower part the calcschist can also contain cm-thick layers of yellow impure limestone that we interpret as calciturbidites. Higher up the blocks become progressively larger (Fig. 5). They commonly reach a decametric length and detailed observation in good outcrops convincingly shows that they are completely surrounded by the calcschists in three dimensions. Finally they pass to very elongated slices of hectometric length with a thickness of several meters or decameters. Some of the largest ones, well visible in the high cliffs SE and E of the Basodino, have been mapped by Burckhardt and Günthert (1957). The contact of this wildflysch upon the Mèdola quartzite is variable. At some places it looks sharp, at others transitional over a distance of several m. Taking account of the fact that an unconformity might exist at the base of the Mèdola quartzite (see above), we have to allow for the possibility that this unconformity would mark the true base of the fourth sedimentary cycle and that the Mèdola quartzite would represent a first stage of normal, well stratified sedimentation in this cycle before the onset of the Alpe Tamia–Campo wildflysch. This question requires more detailed studies.

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