Diechtergletscher-Formation

Representation and status

Index

hD

Color CMYK

40 / 20 / 40 / 0

Color RGB

R: 160 G: 180 B: 140

Rank

lithostratigraphic Formation

Validity

Unit is in Use

Status

informal term

Nomenclature

Deutsch

Diechtergletscher-Formation

Français

Formation du Diechtergletscher

Italiano

Formazione del Diechtergletscher

English

Diechtergletscher Formation

Origin of the Name

Diechtergletscher (BE), Guttannen

Historical Variants

N.N. (Fischer 1905), Diechtergletscher-Formation (Schenker 1986b, Schenker 1987, Labhart & Renner 2012), Diechtergletscher Formation (Berger et al. 2017)

Hierarchy and sequence

Subordinate units

• Maasplanggstock-Metaandesit
• Garwiidi-Diorit

Age

Age at top

• Late Pennsylvanian

Age at base

• Late Pennsylvanian

Geography

Geographical extent

Ofenhoren - Gwächtenhoren - Triftstöckli.

Palaenography and tectonic

Paleogeography

European continental plate

Tectonic unit (resp. main category)

• Aar

References

Definition

Schenker Franz (1986) : Spätpaläozoischer saurer Magmatismus und Beckenbildung im Aar-Massiv unter kompressiver Tektonik. Diss. Univ. Bern

Definition

Berger Alfons, Mercolli Ivan, Herwegh Marco, Gnos Edwin (2017) : Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129

p.43: SCHENKER (1986), SCHENKER & ABRECHT (1987) and OBERHÄNSLI et al.(1988) described in detail the stratigraphic characteristics of the Diechtergletscher Formation and its relationships with the Central Aar Granite (Fig.6). SCHENKER & ABRECHT (1987) illustrated the thermal effect of the intrusion on the metasedimentary and volcanic rocks of the Diechtergletscher Formation (Fig.7b). Biotite-garnet and andalusite-biotite-muscovite parageneses in the clay member indicate temperatures far higher than the regional Alpine metamorphism in this area and are therefore interpreted as a contact aureole produced by the intrusion of the Central Aar Granite.
OBERHÄNSLI et al.(1988) associated the Diechtergletscher Formation to older sequences in the Cavardiras area (the Cavardiras Group of the present map sheet, see Tab. 2 and p. 33). These authors attributed small isoclinal folds to a Variscan deformation event, similar to that affecting the rocks of the Cavardiras Group. These deformed sedimentary rocks were then later affected by the intrusion of the Central Aar Granite. As deformation is extremely heterogeneous in all the Carboniferous rocks, the deformation argument was not taken into account. Therefore, the Diechtergletscher Formation was included in the Diechtergletscher-Tscharren Zone.