Membre de Bure

Torna a Hauptmumienbank-Member

Rappresentazione e statuto

Index
i6Bu
Colore CMYK
cf. Formation de Vellerat
Colore RGB
R: 170 G: 190 B: 165
Rango
Membro litostratigrafico (Sotto-formazione)
Uso
Unità in uso.
Status
termine formale valido

Nomenclatura

Deutsch
Bure-Member
Français
Membre de Bure
Italiano
Membro di Bure
English
Bure Member
Origine del nome
Bure (JU)
Varianti storiche
Humeralis-Mergel = Marnes à Humeralis auct., Bure-Schichten (Gygi 1995 S.11), Bure-Member (Gygi 2000a/b), Bure Member (Gygi 2000b, Gygi 2000c)

Descrizione

Descrizione
Fossiles : Crinoïdes et huîtres (à Boncourt (JU))
Geomorfologia
Rarement affleurant.
Potenza
4-15 m (Aufranc et al. 2016), 10 m à la localité-type (Gygi 2000b/c).

Componenti

Fossili
  • ostreidi
  • crinoidi

Gerarchia e successione

Unità di rango superiore
Unità sovrastante
Unità sottostante
Limite inferiore
Transition tant verticale que latérale depuis le Membre de l'Oolithe rousse.

Età

Geomorfologia
  • Oxfordiano tardo
Osservazioni sul tetto
Oxfordien terminal
Età alla base
  • Oxfordiano tardo
Osservazioni sulla base
Oxfordien terminal
Metodo di datazione
Minéralogie des argiles (Gygi & Persoz 1986 Pl.1a), stratigraphie séquentielle (Gygi et al. 1998 Fig.2).

Geografia

Estensione geografica
Nord du canton du Jura (Ajoie et région de Glovelier) et sud de l’Alsace (France)
Regione-tipo
Ajoie (JU)
Località-tipo
  • Bure (JU)
    Caratteristiche del sito
    • typische Fazies
    Agibilità del sito
    • Bohrkern
    Coordinate
    • (2567650 / 1254670)
    Nota
    • forage d'exploration BUR-2 de la Transjurane (Gygi 2000b Pl.16 Profil RG454, Gygi 2000c)
Sezione-tipo
  • Bure (JU)
    Caratteristiche del sito
    • typische Fazies
    Agibilità del sito
    • Bohrkern
    Coordinate
    • (2567650 / 1254670)
    Nota
    • forage d'exploration BUR-2 de la Transjurane (Gygi 2000b Pl.16 Profil RG454, Gygi 2000c)
Sezione di riferimento
  • Muriaux (JU)
    Caratteristiche del sito
    • Obergrenze
    • typische Fazies
    Coordinate
    • (2564220 / 1232450)
    Nota
    • Combe de la Rochette, 1 km W Muriaux

Paleogeografia e tettonica

  • Malm
Termini generici
Tipo di origine
  • sedimentaria
Metamorfismo
non metamorfo

Referenze

Definizione
Gygi R. A. (1995) : Datierung von Seichtwassersedimenten des Späten Jura in der Nordwestschweiz mit Ammoniten Eclogae Geol. Helv. 88/1, 1-58

S.11 Fig.2
Revisione
Gygi R. A. (2000) : Annotated index of lithostratigraphic units currently used in the Upper Jurassic of northern Switzerland. Eclogae geol. Helv. 93/1, 125-146

p.128: Bure Member (Gygi 1995) ; Previously "Humeralis-Mergel"). Member of the Vellerat Formation ; Synonymy: Gygi (2000b page 59) The Bure Member was renamed by Gygi (1995. p. 11 and Fig. 2). The name is derived from the village of Bure northwest of Porrentruy in Canton Jura (LK 1064 Montbéliard). Outcrops of this marly member are always artificial and temporary. A complete section of the member was provided by the exploration well BUR 2 for the Transjurane superhighway. The well was measured and published by Gygi (2000b. PI. 16) as section RG 454 at coordinates 567.649/254.670. LK 1065 Bonfol. This is the type section. The Bure Member is mainly a soft grey marl, but in some places like the type locality there are thin intercalations of limestone. The thickness is almost exactly 10 m at the type locality. The member contains neither ammonites (Gygi 1995, Fig. 2) nor dinoflagellates (Ghasemi et al.. 1999). It could only be dated by correlations with clay minerals (Gygi & Persoz 1986. PI. 1A, correlation 1) and sequence stratigraphy (Gygi et al. 1998. Fig. 2. sequence boundary O 7 The geographical range of the Bure Member externds over the northern Canton Jura (Ajoie region) and adjacent southern Alsace (France), see Fischer (1965. p. 19 and 58/59) and to the south to Glovelier. Canton Jura. Further south and to the east the member grades into the Oolithe rousse Member and ultimately into the Crenularis Member that can be dated with ammonites at the Bimammatum Subchron.
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