Haslital-Gruppe (spät- bis postvariszische Intrusiva)

Representation and status

Color CMYK

(0%,42%,51%,12%)

Color RGB

R: 225 G: 130 B: 110

Rank

lithostratigraphic Group

Validity

Unit is in Use

Status

informal term

Nomenclature

Deutsch

Haslital-Gruppe (spät- bis postvariszische Intrusiva)

Français

Groupe du Haslital

Italiano

Gruppo del Haslital

English

Haslital Group

Origin of the Name

Haslital (BE), Guttannen

Historical Variants

Group C (Schaltegger 1994), Grimselgranit-Komplex (Labhart 2007), Jüngere Granite (Spillmann et al. 2011), Late to post-Variscan plutonic rocks = Haslital Group (Berger et al. 2017), ZAGR-Clan

Hierarchy and sequence

Subordinate units

• Mittagflue-Granit
• Hinterbalm-Granit
• Balmenegg-Granit
• Zentraler Aare-Granit
• Telltistock-Granit
• Südwestlicher Aare-Granit
• Strem-Granit
• Grimsel-Granodiorit
• Rossbodenstock-Diorit

Age

Age at top

• Sakmarian

Age at base

• Gzhelian

References

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.49: The Haslital Group (Tab. 2) was defined as the association of granitoid bodies forming a temporally and genetically coherent group, which intruded mainly during Asselian times (299– 295 Ma), i.e., at the Carboniferous /Permian boundary (Fig. 4). These plutonic rocks belong to a calc-alkaline to sub-alkaline granitoid suite (SCHALTEGGER 1994). The Haslital Group corresponds to “Group C” of SCHALTEGGER (1994, see also SCHNEEBERGER et al. 2016). Volumetrically, this group represents the largest association of Variscan plutonic rocks in the area covered by the map sheet. They intrude the polycyclic metamorphic basement of the Aar Massif as documented by primary magmatic intrusive contacts crosscutting the pre-Permian structures (Fig. 8). The Haslital Group comprises the Grimsel Granodiorite, Southwestern Aar Granite, the Central Aar Granite, the Mittagflue Granite and the Gastern Granite.
The plutonic rocks of the Haslital Group have suffered different degrees of Alpine deformation, wheras the Gastern Granite is only slightly affected by Alpine deformation. Other members frequently show a gneissic structure. In the Haslital, the Alpine deformation is most intense in the central section of the Central Aar Granite, with increasing strain gradient towards the Grimsel Granodiorite, which represents the most strongly deformed rock type (WEHRENS 2015, SCHNEEBERGER et al. 2016, WEHRENS et al. 2017).

Material and varia