Gruppo d'Antabia

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Darstellung und Status

Farbe CMYK
(22%,11%,0%,12%)
Farbe RGB
R: 175 G: 200 B: 225
Rang
lithostratigraphische Gruppe
Gebrauch
Element ist in Gebrauch
Status
informeller Begriff

Nomenklatur

Deutsch
Antabia-Gruppe
Français
Groupe d'Antabia
Italiano
Gruppo d'Antabia
English
Antabia Group
Herkunft des Namens

Val (d')Antabia (TI)

Historische Varianten

Massiger, gelblicher, bläulicher oder weisser Kalkmaror = basale Glieder der Bündnerschieferserie im Val Antabia (Günthert 1958), Antabia group (Matasci et al. 2011 p.261)

Alter

Alter Top
  • Berriasien
Alter Basis
  • Früher Jura

Geografie

Geographische Verbreitung
Lepontin
Typusregion
Val d'Antabia (TI)

Paläogeografie und Tektonik

Tektonische Einheit (bzw. Überbegriff)
Herkunftstyp
  • sedimentär

Referenzen

Erstdefinition
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.263: We have defined in the Teggiolo zone four distinct stratigraphic units above the Triassic dolomite. They are from bottom upwards: (1) the Ri d’Antabia conglomerate (sporadic); (2) the Sevinèra sandstone; (3) the Sevinèra marble; and (4) the Vanis banded marble/calcschist. They are all separated by sharp limits, are easily mappable and have a regional extent (with the exception of the conglomerate, which is discontinuous but nevertheless forms a mappable unit). Consequently they are conveniently treated as lithostratigraphic formations. It is useful to define this whole set of formations as a lithostratigraphic group that we call the Antabia group, because the most complete cross-section is exposed in the Val Antabia where we also observe its truncation by the base of the next sedimentary cycle. The basal contact of this group on the Paleozoic gneiss or the Triassic dolomite is definitely stratigraphic and erosive, as described above, and the immediately underlying rocks never show any hint of unusual tectonization. In the classical literature the Antabia group is simply called ‘‘marble’’ and is ascribed to the Triassic. In the light of modern Alpine stratigraphy, this age can be absolutely excluded for at least three reasons: (1) At several places the Ri d’Antabia conglomerate erodes and reworks the Triassic dolomite. (2) More generally, the conglomerate and the Sevinèra sandstone have no place in the Triassic paleogeography of the Central and Western Alps (see Mégard- Galli and Baud 1977); and ascribing these rocks to the Triassic would imply a complete change of the paleogeographic and geodynamic reconstructions. (3) The main reason for the Triassic attribution seems to be a tentative correlation of the marbles with the thick limestone layers of the Triassic Briançonnais province. However, the Briançonnais Triassic limestones have very specific lithological characteristics (Baud and Mégard-Galli 1975; Baud 1987) that do not correspond at all to the Sevinèra marbles.

  • Formazione dei Vanis

    Name Origin

    Graben unterhalb Piano dei Vanis (TI) E Campo

    Rang
    lithostratigraphische Formation
    Status
    informeller Begriff
    Kurzbeschreibung
    Alternance centimétrique à décimétrique (aspect rubané) de marbre impur clair, légèrement orangé et de calcschistes sombres d'épaisseur variable.
    Age
    Berriasien
  • Marmo di Sevinèra

    Name Origin

    Alpe di Sevinèra (TI), E Campo (Val Bavona)

    Rang
    lithostratigraphische Formation
    Status
    informeller Begriff
    Kurzbeschreibung
    Kalzitischer Marmor, unten gelblich-bräunlcih, oben weiss.
    Age
    Oxfordien
    • White Member

      Rang
      lithostratigraphisches Member (Subformation)
      Status
      inkorrekter Begriff (jedoch informell gebraucht)
      Kurzbeschreibung
      Marbre calcaire très pur, blanc et massif, de la partie supérieure des Marbres de Sevinèra.
    • Yellow Member

      Rang
      lithostratigraphisches Member (Subformation)
      Status
      inkorrekter Begriff (jedoch informell gebraucht)
      Kurzbeschreibung
      Alternance centimétrique à décimétrique (aspect rubané) de marbre légèrement impur et de calcaire quartzeux et micacé ou de calcschiste. La série devient plus massive vers le haut.
  • Arenaria di Sevinèra

    Name Origin

    Alpe di Sevinèra (TI), E Campo (Val Bavona)

    Rang
    lithostratigraphische Formation
    Status
    informeller Begriff
    Kurzbeschreibung
    Grober, eher massiger, kalkiger Sandstein, z.T. konglomeratisch an der Basis.
    Age
    Bathonien
  • Conglomerato del Ri d'Antabia

    Name Origin

    Ri d'Antabia (TI), SW San Carlo

    Rang
    lithostratigraphische Formation
    Status
    informeller Begriff
    Kurzbeschreibung

    Grobe Konglomeratlagen an der Basis der Teggiolo-Zone, deren Geröllen eine invertierte stratigraphische Abfolge abbilden (mit «Gneiskonglomerat» im Dach).

    Age
    Früher Jura
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