Gansingen-Member
Back to Klettgau-FormationRepresentation and status
- Color CMYK
- siehe Klettgau-Fm.
- Color RGB
- R: 245 G: 185 B: 160
- Rank
- lithostratigraphic Member (Subformation)
- Validity
- Unit is in Use
- Status
- valid formal name
Nomenclature
- Deutsch
- Gansingen-Member
- Français
- Membre de Gansingen
- Italiano
- Membro di Gansingen
- English
- Gansingen Member
- Origin of the Name
- Historical Variants
-
«Gansinger Dolomit s.l.» auct., die Hauptsteinmergel (Gansingerhorizont) (Disler 1914 S.82), Gansinger Dolomit (Wildi 1975), Gansingen Member (Jordan et al. 2016)
- Nomenclatorial Remarks
-
Dolomie moëllon auct.
Description
- Description
-
Das Gansingen-Member besteht aus harten, gelben, brekziösen bzw. stromatolitischen Dolomiten und bunten, dolomitischen Mergeln.
- Geomorphology
- Geländerippe.
- Thickness
- ca. 4 m
Hierarchy and sequence
- Superordinate unit
- Units at roof
- Units at floor
- Upper boundary
-
Oftmals zu grossen Teilen während der späten Trias wegerodiert.
- Lower boundary
-
Einsetzen von marinen, heute vollständig dolomitisierten Kalksteinen mit Ooiden und Mollusken (Schnecken).
Age
- Age at top
-
- Carnian
- Age at base
-
- Carnian
Geography
- Geographical extent
- Nordöstliche Schweiz
- Type locality
-
-
Steinbruch Röt, Gansingen (AG)
Site particularities- Obergrenze
- Untergrenze
- typische Fazies
- Steinbruch, Tongrube
- (2651620 / 1266750)
- Wildi 1983 S.48
-
Steinbruch Röt, Gansingen (AG)
Palaenography and tectonic
-
- Triassic of the Jura Mountains
- Paleogeography
-
Northern Tethyan Carbonate Platform
:
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP) - Tectonic unit (resp. main category)
-
-
Jura
:
Juragebirge
-
Jura
:
- Kind of protolith
-
- sedimentary
- Conditions of formation
-
Marine Transgression aus dem SW, danach wiederum lakustrisch (Playa). Im Osten hauptsächlich Sabkha-Ablagerungen.
- Sequence
-
2. regressiver Zyklus der Klettgau-Formation.
- Metamorphism
- non metamorphic
- Metamorphic facies
-
- secondary dolomitisation
References
- Definition
-
(2016) :
The middle to late Triassic Bänkerjoch and Klettgau formations of northern Switzerland. Swiss J. Geosc. 109/2, 257-284
The Gansingen Member corresponds to the Beaumont Horizon of the Steigerwald Formation in southern Germany. Originally, the fossiliferous «Dolomit von Gansingen» was described as a local curiosity by von Alberti (1864). In the mid-twentieth century, the term «Gansingen Dolomit» became more and more popular among Swiss geologists, first as an equivalent to the basal «Hauptsteinmergel» then to the whole Beaumont Horizon. For Swiss stratigraphers the «Gansingen Dolomit» was a succession rich in dolomite forming small cliffs and ridges within the surrounding marlstones (e.g. Müller et al. 1984). This concept was consequently applied to the core recordings of the Nagra deep drilling program (e.g. Matter et al. 1988; Nagra 1992a, b, 2001) and is now adopted for the definition of the Gansingen Member. Towards northeast the marine late diagenetic dolomite facies (initially limestone) is successively replaced by an evaporitic facies. The primary calcium sulphate is partly replaced by dolomite or even calcite as, for instance, in the Seebi section (Jordan et al. 2016). According to the Nagra boreholerecords(e.g.Matteretal.1988;Nagra1992a,b,2001) this facies is also integrated in the Gansingen Member. This agrees with Schalch (1916) who correlated the heterogeneous dolomite and limestone outcropping in the Klettgau and adjacent Wutach area as equivalents of the «Hauptsteinmergel». He also included the local «Duröhrlestein» variety, characterised by thin dark bituminous calcite (anthraconite or stinkstone) interlayers