Leimbach-Bentonit

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Representation and status

Index
L
Color CMYK
N/A
Color RGB
R: 255 G: 245 B: 255
Rank
lithostratigraphic Bed
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Leimbach-Bentonit
Français
Bentonite de Leimbach
Italiano
Bentonite di Leimbach
English
Leimbach Bentonite
Origin of the Name

Leimbach (ZH)

Historical Variants
Leimbacher Tuff (Pavoni 1963), Leimbacher Bentonit-Horizont (Pavoni & Schindler 1981), Leimbach or Riedhof bentonite (Bolliger 1998a), Leimbacher Bentonit (Gubler 1987, Gubler 2009), Leimbach bentonite (Kälin & Kempf 2009).

Description

Description
Regionaler Bentonitleithorizont (Ca-Montmorillonit), ca. 300 - 310 m über dem «Appenzellergranit»-Leitniveau. Auf 14.20 +/- 0.08 Ma datiert (Gubler et al 1992).

Hierarchy and sequence

Superordinate unit

Age

Age at top
  • Langhian
Note about top
MN6
Age at base
  • Langhian
Note about base
MN6
Dating Method

14.20 ± 0.08 Ma (U/Pb in Zirkonen ; Gubler et al. 1992).

Geography

Geographical extent
Aihltal (Rütschlibach bei Leimbach ZH), Albis-Gebiet (Langnau a.A., Hedingertobel), Grüenhaldentobel 2 km SW Birmensdorf.
Type locality
Type profile
Point of interest

Palaenography and tectonic

  • OSM-II
Paleogeography
North Alpine Foreland Basin
Kind of protolith
  • sedimentary
  • volcanic
Metamorphism
non metamorphic

References

Definition
Pavoni Nazario (1957) : Geologie der Zürcher Molasse zwischen Albiskamm und Pfannenstiel. Vjschr. natf. Ges. Zürich 102, 117

S.129
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