Leimbach-Bentonit

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Representation and status

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

Nomenclature

German
Leimbach-Bentonit
French
Bentonite de Leimbach
Italian
Bentonite di Leimbach
English
Leimbach Bentonite
Origin of the Name

Leimbach (ZH)

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

Synonyms

Synonyms
Non-synonyms
Possible confusion

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).
Geomorphology
-
Thickness
-

Components

Lithological content
  • bentonite
Mineral content
-
Fossil content
-

Hierarchy and succession

Superordinate unit
«Albis-Schichten»
Subordinate units
Units at roof
    -
Units at floor
Lateral equivalents
Upper boundary
-
Lower boundary
-
Stratigraphic discussion
-

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 area
-
Type locality
Type profile
Reference profiles
-
Point of interest
  • Langnau am Albis ZH
    Site particularities
    • typical facies
    Coordinates
    • (2681900 / 1237610)
  • Hedingertobel
    Site particularities
    • upper boundary
    • lower boundary
    • typical facies
    Site accessibility
    • river bed
    Coordinates
    • (2677180 / 1239100)
  • Grüenhaldentobel 2 km SW Birmensdorf ZH
    Site particularities
    • upper boundary
    • lower boundary
    • typical facies
    Site accessibility
    • river bed
    Coordinates
    • (2673950 / 1243450)
  • Schwizertobel bei Langnau a.A.
    Site particularities
    • upper boundary
    • lower boundary
    • typical facies
    Site accessibility
    • river bed
    Coordinates
    • (2681575 / 1238165)

Paleogeography and tectonic

Paleogeography
North Alpine Foreland Basin,
Kind of protolith
  • sedimentary
  • volcanic
Conditions of formation
-
Sequence
-
Tectonic Unit (resp. main category)
Plateau Molasse
Metamorphism
non metamorphic
Metamorphic facies
-
Note on metamorphism
-

References

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

S.129
Revision
-
Important publications
-

Material and varia

Applications
-