Nappe geometry in the Western Swiss Alps

Details

Serval ID
serval:BIB_F8A233989DCC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Nappe geometry in the Western Swiss Alps
Journal
Journal of Structural Geology
Author(s)
Escher A., Masson H., Steck A.
ISSN-L
0191-8141
Publication state
Published
Issued date
1993
Peer-reviewed
Oui
Volume
15
Pages
501-509
Language
english
Abstract
Detailed geological mapping during the last 20 years in the Western
Swiss Alps has shown clearly that most of the lower basement nappes are
fold nappes possessing normal and inverted limbs. Moreover their cores
are made of strongly deformed gneisses indicating that important ductile
strain took place during the formation of the fold nappes. It is
therefore probably wrong to imagine deep basement nappes as rigid slices
as often actually claimed, especially when interpreting seismic
profiles. True `brittle type' thrust nappes involving basement rocks
only occur in the internal and upper parts of the belt. Cover nappes, on
the contrary, are in most parts of the Alpine belt thrust sheets
following more or less the rules of thin-skinned tectonics. Many
basement fold nappes lost part of their sedimentary cover during or just
before their formation, by decollement along ductile horizons. The
result is that many cover thrust nappes in the external part of the Alps
are directly related to their original basement fold nappes.
Create date
07/12/2012 14:51
Last modification date
20/08/2019 16:24
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