«Gneiss plagioclasici a biotite»

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Representation and status

Index
GO
Color CMYK
(0%,0%,0%,100%)
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
unknown status

Nomenclature

Deutsch
«Schiefriger Biotitplagioklasgneis»
Italiano
«Gneiss plagioclasici a biotite»
Origin of the Name

Schiefriger Biotitplagioklasgneis (Reinhard 1964), Gneiss biotitico-plagiodasici (Boriani et al. 1990)

Description

Description

Gneiss plagioclasici a biotite, da lenticolari a scistosi, spesso con muscovite et feldspato alcalino, localemente con orneblenda

Hierarchy and sequence

Age

Age at top
  • Silurian
Note about top

Permian?

Age at base
  • Ordovician

Geography

Geographical extent
Val Veddasca, Val Cannobina.

References

Definition
Boriani A., Giobbi Origoni E., Borghi A., Caironi V. (1990) : The evolution of the "Serie dei Laghi" (Strona-Ceneri and Scisti dei Laghi): the upper component of the Ivrea-Verbano crustal section; Southern Alps, North Italy and Ticino, Switzerland. Tectonophysics 182, 103-118

A muscovi te-rich paragneiss variety occurs in Val Veddasca ("Schieferiger Biotitplagioklasgneis ± Muskovi t fiihrend"; Reinhard. 1964) and in Val Cannobina (shown partly as "Gneiss biotitico-plagiodasici" and partly as "Gneiss minuti" on the Geological Map of the Verbania area by Boriani et al., 1977). It probably represents a more clay-rich facies of the Strona-Ceneri sediments, heteropic with the Ceneri gneiss. Ca-silicate nodules do not occur in this variety.

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