Corpo ultramafico della Val Malenco

Rappresentazione e statuto

Colore CMYK

(22%,0%,38%,37%)

Colore RGB

R: 125 G: 160 B: 100

Rango

tettono-stratigrafia

Uso

Unità in uso.

Status

termine informale

Nomenclatura

Deutsch

Val-Malenco-Ultramafititkörper

Français

Corps ultramafique du Val Malenco

Italiano

Corpo ultramafico della Val Malenco

English

Val Malenco ultramafic body

Origine del nome

Alta Val Malenco (Disgrazia, Italia)

Varianti storiche

Ultramafititkörper der Val Malenco (Peretti 1985), Malenco serpentinite body (Peretti 1986), rocce ultramafiche della zona Disgrazia-Malenco = ultramafiti del Disgrazia (Wenk 1992), Malenco ultramafics (Puschnig et al. 1996), Malenco-Ultramafititen = Ultramafititen des Malenco = Malencokörper(Hansmann et al. 1996), Malenco-Einheit = Malenco-Komplex (Ulrich & Borsien 1996), Ultramafititkörpers der Valmalenco (Spillmann & Trommsdrof 2007), Malenco unit (TK500 / Gouffon et al. 2024)

Descrizione

Descrizione

Stellt eine der grössten Ultramafititmassen (ca. 130 km2) der Alpen dar.

Potenza

1200-1500 m (Spillmann 1993)

Gerarchia e successione

Unità di rango inferiore

• Oficarbonati della Val Ventina
• Ur-Brekzie
• Oficarbonati di Scermendone
• Gabbro del Monte Braccia
• Serpentinite della Val Malenco

Limite superiore

Margna-Decke

Limite inferiore

Lanzada-Sermendone-Zone (Avers- und Suretta-Decke)

Referenze

Revisione

Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.78: Three units with distinct lithological assemblages of oceanic origin, situated in adjacent areas, form the Malenco-Forno-Lizun Nappe. The Malenco unit (Montrasio et al. 2005) consists of large volumes of serpentinite that represent exhumed subcontinental mantle formerly exposed at the ocean floor, and, in a small area adjacent to the Margna Nappe, a transition into continental lower crust in Permian granulite facies, associated with a Permian gabbroic intrusion (Müntener & Hermann 1996). Further north, the Forno unit consists of metabasalts and metagabbros of oceanic origin covered by metasedimentary rocks of Jurassic to Early Cretaceous age, which are in direct contact with the roof of the Bregaglia Intrusion (Puschnig 1998, Froitzheim et al. 1996 a). The Lizun unit, located around the Piz Lizun, northwest of the Engadine Fault and sinistrally offset from the Forno unit (Schmid & Froitzheim 1993), exposes same rocks of oceanic origin as in this latter unit (Liniger & Nievergelt 1990). The Malenco-Forno-Lizun Nappe, together with the Platta Nappe, is located in the hangingwall of the Turba Normal Fault (Nievergelt et al. 1996).