Complesso di Isorno-Bellinzona

Representation and status

Color CMYK
(0%,2%,2%,3%)
Color RGB
R: 247 G: 241 B: 243
Rank
nappe
Validity
Unit is not in Use
Status
valid

Nomenclature

Deutsch
Isorno-Bellinzona-Komplex
Français
Complexe d'Isorno-Bellinzona
Italiano
Complesso di Isorno-Bellinzona
English
Isorno-Bellinzona Complex
Historical Variants

Bosco-Isorno-Orselina zone (Steck 2008), Bosco, Bombogno, Isorno and Orselina-Bellinzona zones (Gouffon et al. 2024)

Description

Description

root zone of Simano and Adula nappes (Vogel & Voll 1976)

... caractérisée par la présence de nombreux corps ultramafiques.

Hierarchy and sequence

Subordinate units

Geography

Geographical extent
[kommt auf den GA25-Blättern 159_Locarno und XXX_Comologno vor]

References

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

p.49: The Bosco, Bombogno, Isorno and Orselina-Bellinzona zones include various rocks (micaschists, para- and orthogneisses, calcschists, marbles, amphibolites and few ultramafics), probably Paleozoic and Mesozoic in age, which can locally be interpreted as a mélange. The Bosco and the Bombogno zones appear between the Antigorio and Monte Leone nappes in the large polyphase Alpe Bosa-Wandfluhhorn Fold located between the Maggia and Antigorio valleys. In the southern part of the eastern (upper) limb of this fold, these two units have not been distinguished and are grouped together in the Isorno Zone.

  • Zona dell'Isorno

    Name Origin

    Bassa Valle dell'Isorno (Italia), Crevadossola [non: Fiume Isorno (TI), Valle Onsernone]

    Rank
    tectonic zone
    Status
    local name (informal)
    In short

    The Isorno Zone (Western Lepontic) corresponds to the Bosco and Bombogno zones in the southern part of the eastern (upper) limb of the large polyphase Alpe Bosa-Wandfluhhorn Fold (located between the Maggia and Antigorio valleys), where these two zones cannot be distinguished. It consists of a very heterogeneous series of para- and orthogneisses, amphibolites, meta-gabbros, ultramafites, calc-schists and marbles that underwent an Oligocene amphibolite facies metamorphism.

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  • Zona di Bellinzona

    Name Origin

    Bellinzona (TI)

    Rank
    tectonic zone
    Status
    valid
    Nomenclatorial Remarks
    <p>Tonerdesilikatgneise von Bellinzona = Adergneise = Injektionsgneise (Gutzwiller 1914)</p>
    In short

    Fein- bis mittelkörnigen (Hornblende)-Biotit-Plagioklas-Gneissen und Amphiboliten, sowie Linsen (cm- bis km-Bereich) von sauren granitoiden Plagioklas-Kalifeldspat-Gneissen bis zu Ultramafititen und Marmoren.

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