Hegau-Bodensee Graben

Représentation et statut

Index

HBG, HCG

Couleur CMYK

N/A

Couleur RGB

R: 241 G: 239 B: 237

Rang

unité tectonique

Usage

Ce terme est en usage.

Status

valide

Nomenclature

Deutsch

Hegau-Bodensee-Graben

Français

Graben du Hegau-Bodensee

Italiano

Graben dell'Hegau-Bodensee

English

Hegau-Bodensee Graben

Variantes historiques

Hegau-Bodensee-Störungszone (DM-Geologie), Hegau-Bodensee graben (Diehl et al. 2018), Bodensee-Hegau Graben = Hegau-Bodensee Graben (Diehl et al. 2020), Hegau-Bodensee-Graben (Nagra), Hegau-Lake Constance Graben System (Fabbri et al. 2021), fossé du Hegau-Bodensee, Hegau-Bodensee Graben (Gouffon et al. 2024)

Paléogéographie et tectonique

Paléogéographie

Bassin d'avant-pays nord-alpin

Type de protolithe

• tectonique

Références

Révision

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

p.22: Further to the east, the Neuhausen Fault marks the southwestern boundary of the NW–SE trending extensional Hegau-Bodensee Graben (Nagra 2008) that represents the southeastern extension of the Freiburg-Bonndorf-Bodensee Fault Zone (Schreiner 1992, Geyer et al. 2003, Egli et al. 2017, Diehl et al. 2023). The Hegau-Bodensee Graben is associated with the Neogene Hegau Volcanic Province (§ 11.1). The Neogene Randen Fault and the Schiener Berg Fault (Zaugg et al. 2008), with a maximum vertical offset of about 250 m (Nagra 2008), together form the southwestern limit of the central graben (Hofmann et al. 2000). Towards the southeast, the Neuhausen Fault intersects the WSW–ENE trending Baden-Irchel-Herdern Lineament (Naef et al. 1995, Malz et al. 2016; see § 3.2). It is thus presumed that this intersection results in an accordingly trending bend in the graben system, as similarly observed further to the north according to the interpretation of 3D seismic data (Birkhäuser et al. 2001). However, the precise continuation of the graben bounding fault system towards the southeast remains unclear. The Quaternary basin of the Bodensee also bears witness to faults likely related to the Hegau-Bodensee Graben (Fabbri et al. 2021). The western boundary fault system possibly joins the St. Gallen Fault – presently considered active (Heuberger et al. 2016) – west of Arbon. The northeastern boundary of the Hegau-Bodensee Graben remains poorly defined, but the South German Platform is apparently also affected by normal faulting east of the lake (Ibele 2015 and ref. therein).