Herznach-Member

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Rappresentazione e status

Sigla
-
Colori CMYK
-
Colori RGB
R: 225 G: 195 B: 155
Rango
Membro litostratigrafico
Uso
Unità in uso.
Status
termine formale valido
SCS nota
-
SCS data
-
Commento
Von Gygi (2000) als Formation definiert, jedoch als solche nicht geeignet, da nicht kartierbar. Definition als Member durch Bitterli (2012).

Nomenclatura

Tedesco
Herznach-Member
Francese
Membre de Herznach
Italiano
Membro di Herznach
Inglese
Herznach Member
Origine del nome

Stillgelegtes Bergwerk östlich von Herznach (AG), s. a. Eisenweg und Fossilien

Varianti storiche
«Anceps-Athleta-Schichten» auct., «Fer sous-oxfordien» auct., Herznach Formation (Gygi 2000b, Gygi 2000c), Herznach-Member (Bitterli 2015)
Osservazioni sul nome
-

Sinonimi

Sinonimo
Non-sinonimo
Confusione possibile

Descrizione

Descrizione
Nur für den Nordwestschweizer Jura: Eisenoolithischer, grauer bis rotbrauner Kalkmergel bis Mergel, teilweise sehr fossilreich (Ammoniten, Bivalven, Gastropoden, Brachiopoden).
Espressione geomorfologica
-
Potenza
Weniger als 10 cm bis max. 5 m ; 3,4 m an der Typlokalität (Gygi 2000c), 6,2 m bai Wölflinswil (Fehlmann & Rickenbach 1962 Pl.2)

Componenti

Litologia
  • limestone, oolithic
  • marna
Eisenoolithischer Mergel bis Kalkmergel
Minerali
  • quarzo
  • pirite
Detritischer Quarz, Pyrit.
Fossili
  • ammoniti
  • spugne
  • vertebrati
  • coralli
  • legno
  • gasteropodi
  • crinoidi
  • nautili
  • belemniti
  • echinoidi
  • bivalvi

Gerarchia e successione

Unità di rango superiore
Ifenthal-Formation
Unità di rango inferiore
Equivalente laterale
Limite superiore
-
Limite inferiore
Die Unter-Erli-Bank des Ängistein-Members bildet die untere Grenze des Herznach-Members.
Osservazioni sulla stratigrafia
-

Età

Età al tetto
Oxfordiano medio
Osservazioni sul tetto
Cordatum-Subzone (diachron ; Gygi & Marchand 1982)
Età alla base
primo Calloviano
Osservazioni sulla base
Enodatum-Subzone (diachron ; Jeannet 1951)
Metodo di datazione
Biostratigraphie: Ammoniten (Gygi & Marchand 1982, Hostettler 2014).

Geografia

Estensione geografica
Nordwestschweiz, von der Grenze zu Frankreich bis in den östlichen Aargauer Tafeljura und weiter in den Kanton Schaffhausen. Am Rand der Franches Montagnes nur reliktisch erhalten (Hostettler 2014). Fehlt im östlichen Aargauer Jura (Auenstein).
Regione-tipo
-
Località-tipo
  • Herznach (AG)
    Caratteristiche del sito
    • typical facies
    Agibilità del sito
    • inaccessible area
    • quarry
    Coordinate
    • (2645340 / 1258360)
    Nota
    • ehem. Bergwerk (Jeannet 1951 Fig.2 A5-F3, Gygi 1977 Pl.11 Profil RG209, Gygi 2000b/c, Gygi 2002, Bitterli-Dreher 2012)
Sezione-tipo
  • Herznach (AG)
    Caratteristiche del sito
    • typical facies
    Agibilità del sito
    • inaccessible area
    • quarry
    Coordinate
    • (2645340 / 1258360)
    Nota
    • ehem. Bergwerk (Jeannet 1951 Fig.2 A5-F3, Gygi 1977 Pl.11 Profil RG209, Gygi 2000b/c, Gygi 2002, Bitterli-Dreher 2012)
  • Kernbohrung Hübstel (AG)
    Caratteristiche del sito
    • lower boundary
    • typical facies
    Agibilità del sito
    • drill core
    Coordinate
    • (2645289 / 1259031)
    Nota
    • Bitterli-Dreher 2012 Fig.5
Sezione di riferimento
  • Tongrube Andil (BL), Liesberg
    Caratteristiche del sito
    • upper boundary
    • lower boundary
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2598625 / 1250100)
    Nota
    • 1-1,2 m (Gygi 1990, Gründel & Hostettler 2012)
  • Grube Weichlen (AG), NW Herznach
    Caratteristiche del sito
    • upper boundary
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2645020 / 1258710)
    Nota
    • Bitterli-Dreher 2012
Punti d'interesse
-

Paleogeografia e tettonica

Paleogeografia
Northern Tethyan Carbonate Platform (Jura > Helv.) :
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP) ,
Tipo di protolito
  • sedimentaria
Condizioni di formazione
seicht/untief sub-marin
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.

S.51
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.133: Herznach Formation (Gygi 2000b) ; Synonymy: Gygi (2000b. p. 51) The name Herznach Formation was proposed by Gygi (2000b p. 51). The type locality is in the galleries of the now closed iron mine near the village of Herznach. Canton Aargau. LK 1069 Frick. The excellent and detailed section published by Jeannet (1951. Fig. 2) can serve as type section even though it is no more accessible. The Herznach Formation begins in this section with bed A5 and ends with bed F3. Bed F3 is the equivalent of bed 8 in section RG 209 in the Herznach iron mine as published by Gygi 1977, Pl. 11, section 1. The Herznach Formation is a succession of iron oolites of varying age and has a thickness of 3.4 m in the old part of the iron mine below Hübstel hill at Herznach. 2.4 m of this thickness are made up by the iron oolitic orebody. The thickness of the orebody increases southwest of Wölflinswil. a village 4 km to the west of Herznach. to 6.2 m (Fehlmann & Rickenbach 1962. PI. 2). The Herznach Formation is therefore a unit which is mappable at the scale of 1:25.000 (see Fehlmann & Rickenbach 1962. PI. 1 The age of the formation is documented with ammonites to be from the latest part of the early Callovian (Enodatum Subchron. Jeannet 1951) to the Cordatum Subchron of the Cordatum Chron (Gygi & Marchand 1982). The Herznach Formation is several meters thick only in the region of Herznach. To the east it pinches out completely at Veltheim. Canton Aargau. in section RG 226 in Mangold & Gygi (1997. Fig. 2) where a thin iron oolite of the middle Bathonian is overlain by the Birmenstorf Member of the Transversarium Chron. middle Oxfordian. Only in Canton Schaffhausen the formation thickens again and there grows to a thickness of more than 2 m (Fehlmann & Rickenbach 1962 Fig. 12). Iron ore of this formation was mined at Blumberg nearby in southern Germany during World War 2. In northwestern Switzerland the formation is usually only a few decimeters thick and forms a marker bed between the Dalle nacrée Member below and the Renggeri Member above. It has been mined for iron at Erzberg east of Schelten Pass in Canton Solothurn (Fehlmann & Rickenbach 1962. p. 44).

Materiale e vario

Utilizzazione
-
  • Schellenbrücke-Bank Mostra dettagli

    Origine del nome

    "Schellenbrücke" = alte Brücke der Staffelegg-Strasse, heute Asperchlus (AG) auf der Karte, NNE Küttigen

    Rango
    Strato litostratigrafico
    Status
    termine formale valido
    Nome da utilizzare
    In breve
    Eisenschüssiger und eisenoolithischer Kalkstein mit zahlreichen Ammoniten (vor allem Cardioceraten) im Dach des Herznach-Members.
    Età
    primo Oxfordiano - primo Oxfordiano
    Potenza
    Meist etwa 0.10 m bis 0.25 m mächtig, stellenweise aber auch nur einige Zentimeter (Bitterli-Dreher 2012).
    Estensione geografica
    Aargauer Jura, wobei die Schellenbrücke-Bank nicht überall ausgebildet ist.
    Regione-tipo
    Aargauer Jura
    Commento
    -