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Reason: The delimitation to foliation is unclear to me. All the more so as that article is linked to en: Foliation (geology) . - 3:22 PM , Sep 26 2012 (CEST)

This ribbon gneiss has a characteristic banding, a sub-term of foliation.

In geology and mineralogy, the formation of leafy surfaces is referred to as foliation (from Latin folia for leaflet ) .

Foliation is an umbrella term for any type of penetrative (“penetrating”) surface structure that was not created by sedimentation . It is indeed largely synonymous with the term foliation used, but the fuzzy name of the foliation applies to all types of continuously existing rock structures (eg. Is here next to the foliation the banding called, so the structure of alternating layers of different composition). Foiled rocks are anisotropic , the foliation occurs in an anisotropic stress state, e.g. B. by regulating non-isometric minerals or by shearing deformation.

Foliation is the name given to the material layer structure in the rock resulting from strong deformation from inhomogeneities. In the ductile shear zone, foliation develops with increasing deformation. In the case of high deformation, a tightly foiled mylonite .

A special form of the phenomenon is the oblique foliation .

See also

Individual evidence

  1. Vinx, Roland .: Rock determination in the field . 1st edition. Elsevier, Spektrum, Akad. Verl, Munich 2005, ISBN 3-8274-1513-6 .
  2. Jordan, Thomas, Schweizer, Volker, Grotzinger, John. dt., Springer-Verlag GmbH .: Press / Siever General Geology . 7., rework. u. updated edition Berlin 2017, ISBN 978-3-662-48341-1 .