Gansingen-Member
Torna a Klettgau-FormationRappresentazione e statuto
- Colore CMYK
- siehe Klettgau-Fm.
- Colore RGB
- R: 245 G: 185 B: 160
- Rango
- Membro litostratigrafico (Sotto-formazione)
- Uso
- Unità in uso.
- Status
- termine formale valido
Nomenclatura
- Deutsch
- Gansingen-Member
- Français
- Membre de Gansingen
- Italiano
- Membro di Gansingen
- English
- Gansingen Member
- Origine del nome
- Varianti storiche
-
«Gansinger Dolomit s.l.» auct., die Hauptsteinmergel (Gansingerhorizont) (Disler 1914 S.82), Gansinger Dolomit (Wildi 1975), Gansingen Member (Jordan et al. 2016)
- Nota sul nome
-
Dolomie moëllon auct.
Descrizione
- Descrizione
-
Das Gansingen-Member besteht aus harten, gelben, brekziösen bzw. stromatolitischen Dolomiten und bunten, dolomitischen Mergeln.
- Geomorfologia
- Geländerippe.
- Potenza
- ca. 4 m
Gerarchia e successione
- Unità di rango superiore
- Unità sovrastante
- Unità sottostante
- Limite superiore
-
Oftmals zu grossen Teilen während der späten Trias wegerodiert.
- Limite inferiore
-
Einsetzen von marinen, heute vollständig dolomitisierten Kalksteinen mit Ooiden und Mollusken (Schnecken).
Età
- Geomorfologia
-
- Carnico
- Età alla base
-
- Carnico
Geografia
- Estensione geografica
- Nordöstliche Schweiz
- Località-tipo
-
-
Steinbruch Röt, Gansingen (AG)
Caratteristiche del sito- Obergrenze
- Untergrenze
- typische Fazies
- Steinbruch, Tongrube
- (2651620 / 1266750)
- Wildi 1983 S.48
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Steinbruch Röt, Gansingen (AG)
Paleogeografia e tettonica
-
- Trias (Jura)
- Paleogeografia
-
Northern Tethyan Carbonate Platform (Jura > Helv.)
:
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP) - Termini generici
-
-
Jura
:
Juragebirge
-
Jura
:
- Tipo di origine
-
- sedimentaria
- Condizioni di formazione
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Marine Transgression aus dem SW, danach wiederum lakustrisch (Playa). Im Osten hauptsächlich Sabkha-Ablagerungen.
- Sequenza
-
2. regressiver Zyklus der Klettgau-Formation.
- Metamorfismo
- non metamorfo
- Facies metamorfica
-
- dolomitizzazione secondaria
Referenze
- Definizione
-
(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