Drusberg-Decke

Back to Drusberg Nappe

Representation and status

Color CMYK
N/A
Color RGB
R: 241 G: 239 B: 237
Rank
nappe
Validity
Unit is in Use
Status
valid

Nomenclature

Deutsch
Drusberg-Decke
Français
Nappe du Drusberg
Italiano
Falda del Drusberg
English
Drusberg Nappe
Origin of the Name

Drusberg = Druesberg (SZ)

Historical Variants

Drusberg-Decke (Lienert et al. 2003)

Description

Description

Die Hauptmasse der oberhelvetische Drusberg-Decke besteht aus Gesteinen der helvetischen Kreide. Frontalen Schuppen der Drusberg-Decke bilden der helvetische Randkette (Niederhorn, Pilatus, Bürgenstock, Urmiberg, Rigi Hochflue).

Age

Age at top
  • Eocene
Age at base
  • Cretaceous

References

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

p.40: From the Kander Valley, the Axen and Drusberg nappes represent the eastward continuation of the Wildhorn Nappe Complex. The transition is caused by a synsedimentary fault (Bachli-Giesenen Fault, Hänni & Pfiffner 2001), which led to the development in the east of a very thick marl sequence (earliest Cretaceous Palfris Formation) that acted as décollement layer during Alpine nappe stacking.

Up to the Engelberg Valley, the stratigraphic series of the Axen Nappe and that of the Drusberg Nappe are practically complementary. The Axen Nappe is composed of a Jurassic series with some Triassic fragments in its base and Cretaceous and Paleogene sediments in the eastern part of the area. The Drusberg Nappe consists only of Cretaceous to Paleogene sediments. Between the Engelberg Valley and the Klöntal, where the Axen Nappe series is complemented by overlying Paleogene sediments, the internal structure of the nappe becomes more complex due to the presence of numerous thrusts following additional décollement levels which split the nappe into several slices. In contrast, the stratigraphic series of the Drusberg Nappe does not change. However, three slices of Late Jurassic limestone (Quinten Formation) are present at its base; one is located in the Muotatal and underlies the Palfris Formation (Wissenwand Slice, Hantke et al. 2013), the other two crop out between the Engelberg Valley and the Vierwaldstättersee, intercalated into the Palfris Formation (Maisander Slices, Menkveld 1995); the latter are considered part of the Axen Nappe.

Between the Thunersee and the Vierwaldstättersee, the Drusberg Nappe contains a large-scale open synformal structure which preserves tectonically higher units in its core, from bottom to top: the Habkern Mélange Zone, the Lower Penninic Schlieren Nappe and klippen of the Middle Penninic Préalpes Médianes Nappe. The internal structure of the Axen Nappe changes abruptly across the Engelberg Valley (Pfiffner et al. 2010, Pfiffner 2011) owing to a fault perpendicular to the fold axes and active during nappe formation. In a similar manner, a fault must be assumed along the southeastern part of the Vierwaldstättersee which explains the very different nappe structure of the Axen and the Drusberg nappes on both sides of the lake (Pfiffner et al. 2010, Pfiffner 2011).

East of the Vierwaldstättersee, the two nappes can be traced all the way up to the Linth Valley. On the western flank of this valley, they are underlain by the Glarus Nappe Complex (including the Mürtschen Nappe), while they are replaced by the Glarus Nappe Complex and the Säntis Nappe on the eastern flank. A major N – S oriented fault is assumed to be present along the Linth Valley in order to explain the dramatic change in internal structure of the Helvetic nappes on either side of the valley.

  • Fluebrig–Drusberg-Element

    Name Origin

    Fluebrig = Fluhbrig (SZ)

    Rank
    tectonic unit
    Status
    informal term
    In short

    Sitrnfalte der Drusberg-Decke.

  • Rederten-Element

    Name Origin

    Rädertenstock = Redertenstock (SZ)/(GL)

    Rank
    tectonic unit
    Status
    informal term
    In short

    Teil der Drusberg-Decke.

  • Wiggis-Element

    Name Origin

    Wiggis (GL)

    Rank
    tectonic unit
    Status
    informal term
    In short
    Teil der Drusberg-Decke.
  • Wissenwand-Schuppe

    Name Origin

    Wissenwand (SZ), südlich Muotathal

    Rank
    tectonic slice
    Status
    local name (informal)
    In short

    The Wissenwand Slice, composed of Late Jurassic limestone (Quinten Formation), forms the base of the Drusberg Nappe in the Muotatal, where it underlies the Palfris Formation of the main part of the nappe.

  • Niederhorn–Pilatus-Schuppe

    Name Origin

    Niederhorn (BE) und Pilatus (NW)/(OW)

    Rank
    tectonic
    Status
    valid
  • Bürgenstock-Urmiberg-Schuppe

    Name Origin

    Bürgenstock (NW)/(LU) und Urmiberg (SZ)

    Rank
    tectonic slice
    Status
    valid
    In short
    Südliche, höhere Schuppe der Helvetische Randkette.
  • Hochflue-Schuppe

    Name Origin

    Rigi Hochflue = Hoflue (SZ)

    Rank
    tectonic slice
    Status
    local name (informal)
    In short
    Nördliche, tiefere Schuppe der Helvetische Randkette.
    • Stad-Formation

      Name Origin

      Alpnachstad (OW)

      Rank
      lithostratigraphic Formation
      Status
      valid formal name
      Nomenclatorial Remarks
      <p>Entspricht den&nbsp;«Globigerinenmergel» auct., sowie den&nbsp;«Fleckenmergel» auct.</p>
      In short

      Grünlich grauer, hell anwitternder, oft gefleckter Mergel, reich an planktonischen Foraminiferen. Gelegentlich siltig-feinsandig oder kalkig; lokal mit Konglomerat- oder Quarzsandsteinlagen an der Basis.

      Age
      Lutetian
      • Wängen-Kalk

        Name Origin

        Wängenalp (OW) im Kleinschlierengebiet

        Rank
        lithostratigraphic Bed
        Status
        informal term
        In short

        Einlagerungen von grobkörnigem, bioklastischem Kalk (u.a. Lithothamnienkalk bzw. Rotalgenkalk) im Stad-Mergel.

      • Jochstock-Konglomerat

        Name Origin

        Jochstock (OW)/(NW)/(BE), Urner Alps, 5 km S Engelberg

        Rank
        lithostratigraphic Bed
        Status
        local name (informal)
        In short

        Konglomerat bis Brekzie, vorwiegend mit Komponenten von schwach gelblich anwitterndem, biogenem Kalk (Betlis-Kalk) in dunkler, mergeliger, z.T. sandig-kalkiger Matrix.

        Age
        late Eocene
      • Rütenen-Konglomerat

        Name Origin

        Rütenen (NW), östlich Beckenried

        Rank
        lithostratigraphic Bed
        Status
        local name (informal)
        In short
        Massives, grobes und schlecht sortiertes Konglomerat mit mergeliger Matrix, das in der Stad-Formation zwischengeschaltet ist. Die Gerölle stammen aus den liegenden Einheiten der Spätkreide und des Paläogens.
        Age
        Eocene
      • Kleintal-Konglomerat

        Name Origin

        Kleintal = Chlital (UR)

        Rank
        lithostratigraphic Bed
        Status
        informal term
        In short
        Konglomerat mit Geröllen aus den liegenden Einheiten der Kreide (Betlis-Kalk bis Schrattenkalk) und des Mitteleozäns (Bürgen-Formation).
        Age
        Priabonian
      • Lochegg-Brekzie

        Name Origin

        Lochegg (GL)

        Rank
        lithostratigraphic Bed
        Status
        local name (informal)
        In short

        Dünne brekziöse Einlagerung mit aufgearbeiteten Globotruncanen innerhalb der Stad-Fm. der «Einsiedler Flyschserie».

        Age
        Eocene
    • Schrattenkalk-Formation

      Name Origin

      Schratte ("zerissen"): Karre, wie am Schratteflue (LU) (früher "Schrattenfluh" geschrieben)

      Rank
      lithostratigraphic Formation
      Status
      informal term
      Nomenclatorial Remarks
      <p>Stellt die&nbsp;«Urgonfazies» des Helvetikums dar.</p>
      In short

      Meist hellgrau anwitternder, gebankter bis massiger Flachwasser-Kalk der helvetischen «Mittleren Kreide», im oberen Teil mit vielfältiger Fauna (Rudisten, Korallen, Gastropoden, Muscheln und Mikrofauna).

      Age
      Late Barremian
      • Oberer Teil der Schrattenkalk-Formation

        Rank
        lithostratigraphic Member (Subformation)
        Status
        incorrect name (though informally used)
        In short

        Informelle Bezeichnung für den oberen Teil des Schrattenkalkes: hellgrau anwitternder, massiger, bioklastreicher Kalk (Rudisten, Korallen, Gastropoden Muscheln und Mikrofauna).

        Age
        Early Aptian
      • Rawil-Member

        Name Origin

        Rawilpass (VS)/(BE)

        Rank
        lithostratigraphic Member (Subformation)
        Status
        informal term
        Nomenclatorial Remarks
        <p>«Unteren Orbitolinen-Schichten» auct., Marnes noirâtres à Orbitolines (Rollier 1917), Mergelschiefer-Einlagerungen (Heim 1917), Mergelband (Alexander et al. 1965), niveau à Orbitolina lenticularis auct. = brèche à Orbitolines (Plancherel 1998)</p>
        In short

        Weicheres Band inmitten des massiven Schrattenkalkes, bestehend aus einer Wechsellagerung von dunklem, mergeligem, flaserigem Kalk und braunem, grümeligem Mergel.

        Age
        Earliest Aptian
      • Unterer Teil der Schrattenkalk-Formation

        Rank
        lithostratigraphic Member (Subformation)
        Status
        incorrect name (though informally used)
        In short

        Informelle Bezeichnung für den unteren Teil des Schrattenkalkes: hellgrau anwitternder, dickbankiger, fossilarmer Kalk.

        Age
        Late Barremian
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