Membre de Buix

Torna alla sintesi

Rappresentazione e status

Sigla
-
Colori CMYK
-
Colori RGB
R: 190 G: 180 B: 185
Rango
Membro litostratigrafico
Uso
Unità in uso.
Status
termine formale valido
SCS nota
-
SCS data
-
Commento
Le Membre de Buix est en partie l'équivalent latéral du Membre du Tiergarten.

Nomenclatura

Tedesco
Buix-Member
Francese
Membre de Buix
Italiano

Membro di Buix

Inglese
Buix Member
Origine del nome
Carrière Les Creppes, NW de Buix = Bux (JU)
Varianti storiche
Kreide von St. Ursanne auct., Buix Member (Gygi 2000b, Gygi 2000c)
Osservazioni sul nome
-

Sinonimi

Non-sinonimo
Confusione possibile

Descrizione

Descrizione
Weisse, weiche, kreidige, ungeschichtete Kalksteine mit kleinen Biohermen, im oberen Teil treten Silex-Knollen auf.
Espressione geomorfologica
zone tendre
Potenza
0 bis 35 m

Componenti

Litologia
-
Minerali
-
Fossili
  • coralli

Gerarchia e successione

Unità di rango superiore
Formation de St-Ursanne
Unità di rango inferiore
Equivalente laterale
Limite superiore
-
Limite inferiore
-
Osservazioni sulla stratigrafia
-

Età

Età al tetto
Oxfordiano medio
Osservazioni sul tetto
-
Età alla base
Oxfordiano medio
Osservazioni sulla base
-
Metodo di datazione
Biostratigraphie (ammonites de la Transversarium-Zone ; Gygi 1995)

Geografia

Estensione geografica
Partie nord du canton du Jura (Ajoie) et jura bâlois (région de Liesberg).
Regione-tipo
-
Località-tipo
  • Buix (JU)
    Caratteristiche del sito
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2569670 / 1259815)
    Nota
    • Carrière Les Creppes (Gygi 2000b S.56 Profil RG347)
Sezione-tipo
-
Sezione di riferimento
  • St-Ursanne (JU)
    Caratteristiche del sito
    • lower boundary
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2579200 / 1246370)
    Nota
    • Referenzprofil im ehemaligen Steinbruch der Kalkfabrik in St-Ursanne (Pümpin 1965 Pl.1 Profil 2, Gygi 1982 Fig.4, Gygi 2000b p.56 Profil RG336, Gygi 2000c)
Punti d'interesse
-

Paleogeografia e tettonica

Paleogeografia
-
Tipo di protolito
  • sedimentaria
Condizioni di formazione
"Rauracien", crayeux (faciès lagunaire)
Sequenza
-
Unità tettonica
Giura
  • S-DE
  • Schwarzwald
Metamorfismo
non metamorfo
Facies metamorfica
-
Osservazioni sul metamorfismo
-

Referenze

Definizione
Gygi R. A. (2000): Integrated stratigraphy of the Oxfordian and Kimmeridgian (Late Jurassic) in northern Switzerland and adjacent southern Germany. , Denkschriften der Schweizerischen Akademie der Naturwissenschaften 104, 152 S.

p.56
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: Buix Member (Gygi 2000b). Previously "Kreide von St. Ursanne" ; Member of the St-Ursanne Formation (Synonymy: Gygi 2000b p. 56) The Buix Member was renamed by Gygi (2000b. p. 56). lt is named after the village of Buix north of Porrentruy in Canton Jura (LK 1065 Bonfol) where it crops out in the quarry of Les Creppes (unpublished section RG 347) where it is easily accessible. However, the base ofthe member is not visible in that quarry. A complete outcrop of the member is in the quarry of the former lime works near the railway station of St-Ursanne, Canton Jura. This section has been studied in detail by Pümpin (1965. PI. 1. section 2). Gygi (2000b. p. 56) proposed beds 8-10 in Pümpin's section to be the reference section of the Buix Member. A schematic version of this section was later published by Gygi (1982. Fig. 4). This is section RG 336 at coordinates 579.200/246.370. LK 1085. St-Ursanne. The Buix Member is a massive, yellowish-white to pure white, more or less porous and friable limestone which was compared with chalk by Ziegler (1962). Coral bioherms occur in this unit near Leymen. France. Flüh, Canton Solothurn, and Delémont. St-Ursanne and Buix. Canton Jura. Locally, the limestone was slightly dolomitic. but the euhedral dolomite crystals have been dissolved and left empty pores as in the unpublished section RG 344. beds 3 and 8 near Courtemaîche, Canton Jura. In this case, the rock weathers in perpendicular rods as was observed by Liniger (1970. p. 7). Large chert nodules occur in the upper Buix Member in the sections RG 343 and 344 at Courtemaîche. The mean thickness of the member is about 35 m. The age was established biochronologically with ammonites by Gygi (1995. Fig. 2) that were found by V. Pümpin at St-Ursanne near the boundary between the Antecedens and the Luciaeformis Subzones in the Transversarium Zone. The Buix Member occurs in the Ajoie region in the northern part of Canton Jura and near Liesberg. Canton Baselland. It is the lagoonal facies of the upper St-Ursanne Formation (Fig. 1).
Pubblicazioni importanti

Materiale e vario

Utilizzazione
-