Hegau-Bodensee Graben
Representation and status
- Index
- HBG, HCG
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- tectonic unit
- Validity
- Unit is in Use
- Status
- valid
Nomenclature
- Deutsch
- Hegau-Bodensee-Graben
- Français
- Graben du Hegau-Bodensee
- Italiano
- Graben dell'Hegau-Bodensee
- English
- Hegau-Bodensee Graben
- Historical Variants
-
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)
Palaenography and tectonic
- Paleogeography
- North Alpine Foreland Basin
- Kind of protolith
-
- tectonic
References
- Definition
-
(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).